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Abstract

Studies on the deposition of ZnO nanosheets grown vertically and perpendicular to conductive substrates have been conducted to obtain tall-type nanosheets (approximately 15 µm in height). However, some applications require short-type nanosheets with a height of about 1µm or less. In this study, short-type ZnO nanosheets were electrodeposited on indium-doped tin oxide substrates under galvanostatic (constant current) mode for a short deposition time. Then, the key parameters to form nanosheet layers with a height in the micrometer order and with good coverage were evaluated. Deposition was performed at 1 mA/cm2 for 60 s. Ar gas was initially bubbled into the electrolyte solution during electrodeposition to remove oxygen. Then, the solution was compared with solutions that did not undergo bubbling. Various electrolyte compositions (various concentrations of acetate and nitrate) were observed in solutions under the non-Ar bubbling condition. Moreover, the oxygen in the solution remarkably affected the morphology of the nanosheet, which became much denser and taller. Therefore, altering electrolyte composition affects morphology, although the effect is not as significant. Electrolyte composition must be optimized to produce the desired short and dense nanosheets because a low concentration of each anion leads to the production of a non-nanosheet layer, whereas a high concentration causes reduction in the density coverage of the nanosheet. A complete discussion of this phenomenon is presented in this study.

References

[1] Lin, C-Y.,Lai, T-H.,Chen, H-W.,Chen, J-G.,Kung, C-W.,Vittal, R., Ho, K-C. 2011. Highly efficient dye-sensitized solar cell with a ZnO nanosheet-based photoanode. Energy Env. Sci. 4: 3448–3455, https://doi.org/10.1039/c0ee00587h.

[2] Kung, C.,Chen, H.,Lin, C.,Lai, Y.,Vittal, R., Ho, K. 2014. Electrochemical synthesis of a double-layer film of ZnO nanosheets/nanoparticles and its application for dye-sensitized solar cells. Prog. Photovolt Res. Appl. 22: 440–451, https://doi.org/1 0.1002/pip.

[3] Zhang, J., Meguid, S A. 2017. Piezoelectricity of 2D nanomaterials: characterization, properties, and applications. Semicond. Sci. Technol. 32: 043006, https://doi.org/10.1088/1361-6641/aa5cfb.

[4] Zhang, R.,Hummelgård, M.,Olsen, M., Jonas, Ö. 2017. Nanogenerator made of ZnO nanosheet networks. Semicond. Sci. Technol. 32: 054002, https://doi.org/10.1088/1361-6641/aa660c.

[5] Ibn-mohammed, T., Koh, S.C.L., Reaney, I.M., Acquaye, A.,Schileo, G.,Mustapha, K B. and Greenough, R. 2017. Perovskite solar cells: An integrated hybrid lifecycle assessment and review in comparison with other photovoltaic technologies. Renew. Sustain. Energy Rev. 80: 1321–1344, https://doi.org/10.1016/j.rser.2017.05.095.

[6] Juarez-Perez, E.J., Wussler, M., Fabregat-Santiago, F., Lakus-Wollny, K., Mankel, E., Mayer, T., Jaegermann, W., Mora-Sero, I. 2014. the role of the selective contacts in the performance of lead halide perovskite solar cells. J. Phys. Chem. Lett. 5: 680–685, https://doi.org/10.1021/jz500059v.

[7] Stranks, S.D., Eperon, G.E., Grancini, G., Menelaou, C., Alcocer, M.J.P., Leijtens, T., Herz, L.M., Petrozza, A., Snaith, H.J. 2013. Electron-hole diffusion lengths exceeding 1 micrometer in an organometal trihalide perovskite absorber. Sci. 342: 341–344, https://doi.org/10.1126/science.1243982.

[8] Guo, W., Liu, T., Gou, Z., Zheng, W., Chen, Y., Wang, Z. 2013. Hydrothermal synthesis of ultrathin ZnO nanosheets and their gas-sensing properties. J Mater. Sci. Mater. Electron. 24: 1764–1769, https://doi.org/10.1007/s10854-012-1009-x.

[9] Cao, B., Cai, W., Li, Y., Sun, F., Zhang, L. 2005. Ultraviolet-light-emitting ZnO nanosheets prepared by a chemical bath deposition. Nanotechnol. 16: 1734-1738, https://doi.org/10.1088/0957-4484/16/9 /054.

[10] Timuda, G.E., Waki, K. 2020. Galvanostatic electrodeposition of ZnO nanosheet: Effect of different applied current densities and deposition times on the nanosheet morphology. Adv. Nat. Sci. Nanosci. Nanotechnol. 11: 025005, https://doi.org/1 0.1088/2043-6254/ab7c60.

[11] Zarebska, K., Kwiatkowski, M., Gniadek, M., Skompska, M. 2013. Electrodeposition of Zn(OH)2, ZnO thin films and nanosheet-like Zn seed layers and influence of their morphology on the growth of ZnO nanorods. Electrochim. Acta. 98: 255–262, https://doi.org/10.1016/j.electacta.2013.03.051.

[12] Xu, F., Lu, Y., Xie, Y., Liu, Y. 2009. Controllable morphology evolution of electrodeposited ZnO nano/micro-scale structures in aqueous solution. Mater. Des. 30: 1704–1711, https://doi.org/10.101 6/j.matdes.2008.07.024.

[13] Chen, H., Zhu, L., Liu, H., Li, W. 2013. Effects of preparing conditions on the nanostructures electrodeposited from the Zn(NO3)2 electrolyte containing KCl. Thin Solid Films 534: 205–213, https://doi.org/10.1016/j.tsf.2013.02.060.

[14] Liang, W., Li, W., Chen, H., Liu, H., Zhu, L. 2015. Exploiting electrodeposited flower-like Zn4(OH) 6SO4.4H2O nanosheets as precursor for porous ZnO nanosheets. Electrochim. Acta. 156: 171–178, https://doi.org/10.1016/j.electacta.2015.01.022.

[15] Hou, Q., Zhu, L., Chen, H., Liu, H., Li, W. 2013. Highly regular and ultra-thin porous ZnO nanosheets : An indirect electrodeposition method using acetate-containing precursor and their application in quantum dots-sensitized solar cells. Electrochim. Acta. 94: 72–79, https://doi.org/ 10.1016/j.electacta.2013.01.122.

[16] Hou, Q., Zhu, L., Chen, H., Liu, H., Li, W. 2012. Growth of porous ZnO nanosheets by electrodeposition with the addition of KBr in nitrate electrolyte. Mater. Lett. 89: 283–286, https://doi.org/10.1016/j.matlet.2012.08.137.

[17] Hou, Q., Zhu, L., Chen, H., Liu, H., Li, W. 2012. Growth of flower-like porous ZnO nanosheets by electrodeposition with Zn5(OH)8(NO3)2•2H2O as precursor. Electrochim. Acta. 78: 55–64, https://doi.org/10.1016/j.electacta.2012.05.113.

[18] Hosono, E., Tokunaga, T., Ueno, S., Oaki, Y., Imai, H., Zhou, H., Fujihara, S. 2012. Crystal-growth process of single-crystal-like mesoporous ZnO through a competitive reaction in solution. Cryst. Growth Des. 12: 2923–2931, https://doi.org/10.10 21/cg300116h.

[19] Moezzi, A., Mcdonagh, A., Dowd, A., Cortie, M. 2013. Zinc hydroxyacetate and its transformation to nanocrystalline zinc oxide. Inorg. Chem. 52: 95–102, https://doi.org/10.1021/ic302328e.

[20] Lira-Cantú, M. 2017. Perovskite solar cells: Stability lies at interfaces. Nat. Energy 2: 17115, https://doi.org/10.1038/nenergy.2017.115.

[21] Mingorance, A., Xie, H., Kim, H., Wang, Z., Balsells, M., Morales-melgares, A., Domingo, N., Kazuteru, N., Tress, W., Fraxedas, J., Vlachopoulos, N., Hagfeldt, A., Lira-Cantu, M. 2018. Interfacial engineering of metal oxides for highly stable halide perovskite solar cells. Adv. Mater. Interfaces. 5: 1800367, https://doi.org/10.1002/ad mi.201800367.

[22] Chen, J., Chen, T., Xu, T., Chang, J-Y., Waki, K. 2019. MAPbI3 self‐recrystallization induced performance improvement for oxygen‐containing functional groups decorated carbon nanotube‐based perovskite solar cells. Sol. RRL 3: 1900302, https://doi.org/10.1002/solr.201900302.

[23] Li, X., Chen, C., Cai, M., Hua, X., Xie, F., Liu, X., Hua, J. 2018. Efficient passivation of hybrid perovskite solar cells using organic dyes with -COOH functional group. Adv. Energy Mater. 8: 1800715, https://doi.org/10.1002/aenm.201800715.

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