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Fully solution-processed zinc oxide MIS capacitors by ultrasonic spray pyrolysis in air ambient
Miguel A. Domingueza,
Corresponding author
madominguezj@gmail.com

Corresponding author.
, Abdu Orduña-Diazb
a Centro de Investigaciones en Dispositivos Semiconductores, Instituto de Ciencias, Benemerita Universidad Autónoma de Puebla (BUAP), Puebla 72570, Mexico
b Centro de Investigación en Biotecnología Aplicada (CIBA), Instituto Politécnico Nacional, Tlaxcala, Tlaxcala 72197, Mexico
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">1</span><span class="elsevierStyleSectionTitle" id="sect0015">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">In recent years&#44; the development of transparent electronics has achieved considerable progress since wearable electronics&#44; transparent circuitry&#44; e-paper&#44; solar cells and more &#40;<a class="elsevierStyleCrossRefs" href="#bib0015">Bashir et al&#46;&#44; 2009&#59; Langley et al&#46;&#44; 2013</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0130">Zhu&#44; Fang&#44; Preston&#44; Li&#44; &#38; Hu&#44; 2014</a>&#41;&#46; Although the recent development in thin-film transistors &#40;TFTs&#41; has been very important to enable this technology&#44; it is necessary to develop other basic devices such as transparent capacitors&#46; These basic devices could work as sensors&#44; energy storage from solar cells&#44; memory devices and charge&#8211;discharge capacitors in active-matrix displays could also be very useful to analyze the quality of the dielectric-semiconductor interface in field effect devices &#40;<a class="elsevierStyleCrossRef" href="#bib0055">Khan&#44; Bhansali&#44; &#38; Alshareef&#44; 2011</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0105">Xian &#38; Yoon&#44; 2009</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0120">Yu&#44; Li&#44; Zhang&#44; Sun&#44; &#38; Zheng&#44; 2015</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0125">Zhang et al&#46;&#44; 2015</a>&#41;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">The use of transparent electrodes is key for developing transparent electronic devices&#44; in which indium tin oxide &#40;ITO&#41; has been most commonly used&#46; However&#44; because of the high demand of indium&#44; the use of ITO will be economically unviable&#46; Therefore&#44; much research is under development to find alternatives to ITO&#46; On the other hand&#44; in addition to the unviability of ITO&#44; the typically used deposition techniques involve high vacuum&#44; present incompatibility with large-area substrates and high-cost&#46; For these reasons&#44; solution-process techniques have become very attractive because of their low-cost&#44; simplicity&#44; compatibility with large-area substrates and the film deposition under ambient conditions&#46; It is important to mention that the consecutive solution-deposition of thin films to fabricate semiconductor devices has been a great challenge &#40;<a class="elsevierStyleCrossRef" href="#bib0045">Hunter et al&#46;&#44; 2015</a>&#41;&#46; In this work&#44; we present fully solution-processed zinc oxide metal&#8211;insulator&#8211;semiconductor &#40;MIS&#41; capacitors employing the ultrasonic spray pyrolysis and spin-coating techniques&#46; Fluorine tin oxide and spin-on glass are used as transparent electrode and dielectric film&#44; respectively&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">2</span><span class="elsevierStyleSectionTitle" id="sect0020">Experiment</span><p id="par0015" class="elsevierStylePara elsevierViewall">The films were deposited using a typical home-made ultrasonic spray pyrolysis &#40;USP&#41; deposition system adapted from an ultrasonic humidifier &#40;Heaven Fresh&#41;&#46; The transparent electrodes were obtained using fluorine tin oxide &#40;FTO&#41; from 0&#46;2<span class="elsevierStyleHsp" style=""></span>M precursor solution of tin tetrachloride pentahydrate in ethanol with ammonium fluoride diluted in deionized water prepared with F&#47;Sn ratio of 0&#46;52&#46; The ZnO was obtained using 0&#46;2<span class="elsevierStyleHsp" style=""></span>M precursor solution of zinc acetate in methanol&#46; The transparent dielectric was obtained using a spin-on glass solution &#40;SOG700B Filmtronics&#41; diluted 3&#58;1 with deionized water &#40;DI&#41; and spin coated onto the samples &#40;<a class="elsevierStyleCrossRef" href="#bib0020">Dominguez&#44; Rosales&#44; Torres&#44; Moreno&#44; &#38; Ordu&#241;a&#44; 2012</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0035">Dominguez&#44; Obregon&#44; &#38; Luna-Lopez&#44; 2016</a>&#41;&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">The orientation of the film was investigated using an X-ray diffractometer &#40;XRD&#41; &#40;Discover D8-Bruker AXS&#41; at 2<span class="elsevierStyleItalic">&#952;</span> range between 20&#176; and 70&#176; and 0&#46;002&#176; step&#46; For the photoluminescence spectroscopy&#44; a laser of He-Cd with 325<span class="elsevierStyleHsp" style=""></span>nm line was used as exciting source&#46; The photoluminescence measurement was performed using a silicon PIN Thorlabs &#40;DET-210&#41; detector with a spectral response of 200&#8211;1100<span class="elsevierStyleHsp" style=""></span>nm&#46; The conventional lock-in technique was employed seeking to minimize the effect of noise&#46; The voltage signal was acquired with a Computer Boards CIO-DAS08 data acquisition card&#44; which operates in conjunction with a stepper motor controller to position the monochromator Sciencetech 9040 to the appropriate wavelength&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">The IR absorption spectra of the films were measured with a Brucker FTIR Vertex-70 spectrometer&#46; The IR spectrum was observed for wave numbers between 3500 and 400<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span>&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">To fabricate the transparent MIS capacitors&#44; glass slides were used as substrates&#46; The glass substrates were chemically cleaned&#46; First&#44; they were cleaned in acetone for 10<span class="elsevierStyleHsp" style=""></span>min&#44; followed with isopropyl alcohol&#44; also for 10<span class="elsevierStyleHsp" style=""></span>min&#44; in an ultrasonic bath&#46; Finally&#44; the substrates were rinsed with deionized water&#46; After that&#44; FTO deposited by USP was used as bottom transparent electrode&#46; Then&#44; the SOG&#47;DI dielectric film was spin-coated onto the samples at room temperature at 3000<span class="elsevierStyleHsp" style=""></span>rpm for 30<span class="elsevierStyleHsp" style=""></span>s&#46; The samples were annealed at 100<span class="elsevierStyleHsp" style=""></span>&#176;C for 15<span class="elsevierStyleHsp" style=""></span>min to reduce humidity and evaporate most of the solvents&#44; to finally be annealed for 5<span class="elsevierStyleHsp" style=""></span>h at 200<span class="elsevierStyleHsp" style=""></span>&#176;C in air ambient&#46; Afterwards&#44; as active layer&#44; ZnO was deposited by USP using air as carrier gas at flow rate of 467<span class="elsevierStyleHsp" style=""></span>sccm on a hotplate at 200<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; Finally&#44; FTO was deposited by USP as the top transparent electrode through a shadow mask&#46; The MIS capacitors have an area of 0&#46;002<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">2</span> &#40;1<span class="elsevierStyleHsp" style=""></span>mm<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>0&#46;2<span class="elsevierStyleHsp" style=""></span>mm&#41;&#46; The thickness of the ZnO and SOG&#47;DI films was 350<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>15<span class="elsevierStyleHsp" style=""></span>nm and 44<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>5<span class="elsevierStyleHsp" style=""></span>nm&#44; respectively&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">The capacitance&#8211;voltage characteristics were measured using the Keithley-4200 semiconductor characterization system equipped with the 4200-CVU integrated <span class="elsevierStyleItalic">C</span>&#8211;<span class="elsevierStyleItalic">V</span>&#44; under dark conditions&#44; air ambient and room temperature&#46; The measurements here reported are representative of 9 capacitors&#46; The measurements present a fluctuation lower than the &#177;10&#37; on the accumulation capacitance and breakdown voltage&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">3</span><span class="elsevierStyleSectionTitle" id="sect0025">Results and discussion</span><p id="par0040" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a> shows the schematic cross section of the ZnO MIS capacitors and a top-view photograph of the MIS capacitors&#46; The MIS capacitors are highly transparent&#44; which makes their use feasible in transparent electronics&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0045" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a> shows the XRD pattern of the ZnO film&#46; The peaks related to the planes &#40;100&#41;&#44; &#40;002&#41;&#44; &#40;101&#41;&#44; &#40;102&#41;&#44; &#40;110&#41;&#44; &#40;103&#41; and &#40;112&#41; can be identified according with the JCPDS Card No&#46; 36-1451&#44; where the strongest peak is associated to the &#40;100&#41; plane&#46; The XRD diffractogram shows a polycrystalline nature regardless of the low deposition temperature&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0050" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a> shows the room temperature photoluminescence &#40;PL&#41; spectra of the ZnO film&#46; It shows a PL spectrum with a peak centered at 390<span class="elsevierStyleHsp" style=""></span>nm and a high intensity broad band from 450 to 700<span class="elsevierStyleHsp" style=""></span>nm&#46; The UV emission peak at 390<span class="elsevierStyleHsp" style=""></span>nm is associated with the near band-edge &#40;NBE&#41; emission of the wide gap attributed to the recombination of the free excitons &#40;<a class="elsevierStyleCrossRef" href="#bib0080">Padilla-Rueda&#44; Vadillo&#44; &#38; Laserna&#44; 2012</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0090">Sepulveda-Guzman et al&#46;&#44; 2010</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0110">Xiao&#44; Zhao&#44; Liu&#44; &#38; Lian&#44; 2013</a>&#41;&#46; The visible emission broad band from 450 to 700<span class="elsevierStyleHsp" style=""></span>nm includes the defects and impurities&#44; which are considerable in our case&#46; The origin of this visible emission band may be attributed to oxygen vacancies&#44; zinc vacancies&#44; oxygen antisites&#44; zinc antisites&#44; oxygen interstitial and zinc interstitial &#40;<a class="elsevierStyleCrossRef" href="#bib0050">Janotti &#38; Van de Walle&#44; 2007</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0065">Lin&#44; Fu&#44; &#38; Jia&#44; 2001</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0100">Wang et al&#46;&#44; 2006</a>&#41;&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0055" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a> shows the FTIR spectra of the ZnO film&#46; The peak can be observed at 415<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> related to Zn<span class="elsevierStyleGlyphsbnd"></span>O stretching modes &#40;<a class="elsevierStyleCrossRef" href="#bib0005">Adamopoulos et al&#46;&#44; 2011</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0040">Gayen&#44; Sarkar&#44; Hussain&#44; Bhar&#44; &#38; Pal&#44; 2011</a>&#41;&#46; The peak at 1627<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> is attributed to O<span class="elsevierStyleGlyphsbnd"></span>H bending modes&#46; Also&#44; the peaks at 2500&#8211;3500<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> are due to C<span class="elsevierStyleGlyphsbnd"></span>H and O<span class="elsevierStyleGlyphsbnd"></span>H stretching modes &#40;<a class="elsevierStyleCrossRefs" href="#bib0005">Adamopoulos et al&#46;&#44; 2011&#59; Gayen et al&#46;&#44; 2011</a>&#41;&#46; The peaks at 1413<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> and 1530<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> are attributed to C<span class="elsevierStyleGlyphsbnd"></span>O stretching modes&#44; while at 1750<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span> they are attributed to C<span class="elsevierStyleGlyphdbnd"></span>O bonds &#40;<a class="elsevierStyleCrossRefs" href="#bib0005">Adamopoulos et al&#46;&#44; 2011&#59; Gayen et al&#46;&#44; 2011</a>&#41;&#46; The presence of C<span class="elsevierStyleGlyphsbnd"></span>O bonds suggests an incomplete precursor pyrolysis due to the low deposition temperature &#40;<a class="elsevierStyleCrossRef" href="#bib0005">Adamopoulos et al&#46;&#44; 2011</a>&#41;&#46; However&#44; the characteristic Zn<span class="elsevierStyleGlyphsbnd"></span>O band&#44; approximately at 415<span class="elsevierStyleHsp" style=""></span>cm<span class="elsevierStyleSup">&#8722;1</span>&#44; indicates the ZnO formation&#46; On the other hand&#44; it is important to mention that bonds related to O<span class="elsevierStyleGlyphsbnd"></span>H stretching have been previously reported in ZnO films&#44; indicating the presence of O<span class="elsevierStyleGlyphsbnd"></span>H complexes that are associated with different defects and increased free-carrier concentration &#40;<a class="elsevierStyleCrossRefs" href="#bib0005">Adamopoulos et al&#46;&#44; 2011&#59; Gayen et al&#46;&#44; 2011</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0070">McCluskey&#44; Jokela&#44; Zhuravlev&#44; Simpson&#44; &#38; Lynn&#44; 2002</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0095">Shi et al&#46;&#44; 2005</a>&#41;&#46; This agrees with what was observed in the photoluminescence spectra&#46; Although the ZnO films need to be improved&#44; the films have been successfully used in TFTs fabricated in silicon wafers &#40;<a class="elsevierStyleCrossRef" href="#bib0025">Dominguez et al&#46;&#44; 2015</a>&#59; <a class="elsevierStyleCrossRef" href="#bib0030">Dominguez-Jimenez et al&#46;&#44; 2015</a>&#41;&#46; Further research is necessary to optimize the ZnO film&#46;</p><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0060" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0025">Fig&#46; 5</a> shows the capacitance&#8211;voltage characteristics at 10<span class="elsevierStyleHsp" style=""></span>kHz for the MIS capacitors&#46; When a negative voltage is applied at the top contact&#44; there is an accumulation layer of electrons in the ZnO film at the SOG&#47;DI-ZnO interface&#44; as a result&#44; the capacitance&#8211;voltage characteristics show the dielectric capacitance &#40;Cox&#41;&#46; On the other hand&#44; when a positive voltage is applied at the top contact&#44; the characteristics show a minimum capacitance due to the depletion region in the ZnO film at the SOG&#47;DI-ZnO interface&#46; From the capacitance&#8211;voltage characteristics&#44; it can be observed that there is a very low hysteresis when the characteristics are forward and reverse measured&#46; Nevertheless&#44; at negative voltage values&#44; the accumulation region presents effects of interface states &#40;<a class="elsevierStyleCrossRef" href="#bib0075">Neamen&#44; 2003</a>&#41;&#46; This is attributed to the defects in the ZnO film near the dielectric-semiconductor interface&#44; as the photoluminescence and FTIR spectroscopies show&#46; Despite this&#44; the MIS capacitors display a similar behavior compared to the capacitance&#8211;voltage curves in ZnO TFTs fabricated in silicon wafers with thermally grown silicon oxide as gate dielectric &#40;<a class="elsevierStyleCrossRef" href="#bib0010">Bang et al&#46;&#44; 2011</a>&#41;&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia><p id="par0065" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0030">Fig&#46; 6</a> shows the current density of the ZnO MIS capacitors&#46; Typically&#44; in solution-processed devices&#44; the evaporation of solvents during the deposition of the films induces pores and lower density in the film which affect the electrical characteristics of the devices &#40;<a class="elsevierStyleCrossRef" href="#bib0115">Yoo et al&#46;&#44; 2013</a>&#41;&#46; The breakdown voltage of the MIS capacitor can be observed at 36<span class="elsevierStyleHsp" style=""></span>V because of the dielectric breakdown&#46; Although a higher capacitor breakdown voltage was expected&#44; the values of current density and capacitor breakdown voltage obtained are reliable for electronic devices applications &#40;<a class="elsevierStyleCrossRefs" href="#bib0085">Park et al&#46;&#44; 2013&#59; Yoo et al&#46;&#44; 2013</a>&#41;&#46;</p><elsevierMultimedia ident="fig0030"></elsevierMultimedia><p id="par0070" class="elsevierStylePara elsevierViewall">From the overall characteristics presented&#44; ZnO MIS capacitors can be explored to be used in transparent electronics&#46; ZnO MIS capacitors were fabricated employing simple and low-cost solution-process techniques with no-vacuum needed&#44; using feasible and easily-prepared precursor solutions&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">4</span><span class="elsevierStyleSectionTitle" id="sect0030">Conclusions</span><p id="par0075" class="elsevierStylePara elsevierViewall">In summary&#44; the development of fully solution-processed zinc oxide metal&#8211;insulator&#8211;semiconductor capacitors employing the ultrasonic spray pyrolysis and spin-coating techniques was successfully presented&#46; Fluorine tin oxide and spin-on glass were used as transparent electrode and dielectric film&#44; respectively&#46; The MIS capacitors were highly transparent&#44; which their use makes feasible in transparent electronics&#46; The capacitance&#8211;voltage characteristics showed a very low hysteresis when the characteristics were forward and reverse measured&#46; The accumulation region presents effects of interface states attributed to the defects in the ZnO film near the dielectric-semiconductor interface&#44; as the photoluminescence and FTIR spectroscopies showed&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Conflict of interest</span><p id="par0090" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">In this work&#44; the fabrication and characterization of fully solution-processed zinc oxide metal&#8211;insulator&#8211;semiconductor &#40;MIS&#41; capacitors by ultrasonic spray pyrolysis &#40;USP&#41; are presented&#46; Fluorine tin oxide by USP was used as transparent electrode&#44; while spin-on glass by spin-coating was used as dielectric and zinc oxide by USP was used as active layer&#46; Also&#44; the zinc oxide film was characterized using photoluminescence spectroscopy&#44; X-ray diffraction and Fourier transform infrared spectroscopy&#46; The MIS capacitors were fabricated over glass slides and were highly transparent in the visible range&#44; which makes their use feasible in transparent electronics&#46; Employing capacitance&#8211;voltage and current&#8211;voltage measurements&#44; the MIS capacitors were characterized&#46;</p></span>"
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Article information
ISSN: 16656423
Original language: English
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2021 June 28 7 35
2021 May 12 10 22
2021 April 45 25 70
2021 March 16 4 20
2021 February 5 6 11
2021 January 15 12 27
2020 December 14 9 23
2020 November 11 7 18
2020 October 11 9 20
2020 September 22 6 28
2020 August 28 1 29
2020 July 13 3 16
2020 June 9 7 16
2020 May 23 4 27
2020 April 19 1 20
2020 March 20 0 20
2020 February 14 1 15
2020 January 17 4 21
2019 December 12 5 17
2019 November 21 7 28
2019 October 19 4 23
2019 September 28 14 42
2019 August 15 5 20
2019 July 21 7 28
2019 June 32 22 54
2019 May 57 47 104
2019 April 44 29 73
2019 March 10 7 17
2019 February 19 6 25
2019 January 8 4 12
2018 December 16 5 21
2018 November 17 8 25
2018 October 25 13 38
2018 September 46 5 51
2018 August 9 1 10
2018 July 13 1 14
2018 June 20 4 24
2018 May 24 7 31
2018 April 12 3 15
2018 March 8 1 9
2018 February 13 0 13
2018 January 12 1 13
2017 December 9 0 9
2017 November 15 0 15
2017 October 12 2 14
2017 September 10 0 10
2017 August 20 2 22
2017 July 16 2 18
2017 June 9 5 14
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