Investigation of Various Nano-Structural Morphologies of Zinc Oxide for their Applications in Dye-Sensitized Solar Cells

Abstract:

In the current study, various morphologies of zinc oxide (ZnO) including nanorods, nanoflowers, nanosheets/flakes, nanospherical particles, nanohexagonal sheets, and nanoneedles have been prepared by using single step and two-step hydrothermal processes with optimized parameters such as growth temperature, growth time and compositions of both the seed and growth solutions. Fluorine doped tin oxide (FTO) coated glass was used as the substrate. The prepared morphologies were characterized with the help of scanning electron microscopy (SEM) and the purity of nanostructures was confirmed by elemental analysis (EDX). These nanostructures were used as photo-anode material to fabricate the DSSC using a dye (Rhodamine B) for enhancing the range of solar spectrum that is to be adsorbed. Finally the fabricated solar cells were characterized in terms of their efficiency, gauged by their fill factor. Among different morphologies investigated as photo anode materials; nanosheets/flakes were found to be showing maximum efficiency, with fill factor values around 0.5 due to their larger surface area, better porosity and enhanced capability of light trapping and scattering.

• Periodical: Key Engineering Materials (Volume 778)
• Pages: 91-99
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.778.91
• Online since: September 2018
• Authors: Muhammad Ramzan Abdul Karim*, Muhammad bin Ahmed, Ehsan Ul Haq, Khalid Mahmood, Azhar Hussain, Sulaik Ullah Iqbal, Syed Abrar Hussain Shah, Yasir Faheem Joya, Ahmed Sher Awan
• Keywords: Dye-Sensitized Solar Cell, Hydrothermal Growth, Light-Scattering, Nanostructures, Semiconductor, Surface Area, Zinc Oxide

References

[1] S. Lee, S. Yang, H. Yun, K. Jeong, Y. Kim, S. Kim, H. Lee, G. Lee and J. Oh, Pillar Type Silicon-Oxide-Nitride-Oxide-Silicon Flash Memory Cells with Modulated Tunneling Oxide, Trans. Electr. Electron. Mater., 14 (2013) 250-253.

DOI: 10.4313/teem.2013.14.5.250

[2] D. Li, J. She, S. Xu and S. Deng, Zinc Oxide Nanowire Lateral Field Emission Devices and its Application as Display Pixel Structures, IEEE Trans. Elect. Dev., 60 (2013) 2924-2930.

DOI: 10.1109/ted.2013.2272597

[3] M. Wang, Y. Wang and J. Li, ZnO nanowire arrays coating on TiO2 nanoparticles as a composite photoanode for a high efficiency DSSC, Chem. Commun., 47 (2011) 11246-11248.

DOI: 10.1039/c1cc15310b

[4] H. Waqas, M. Salman, A. Riaz, N. Riaz and S. Shabbir, Unique morphologies of zinc oxide synthesized by thermal decomposition and co-precipitation routes: Ultraviolet absorption and luminescence characteristics, Cryst. Res. Technol., 50 (2015).

DOI: 10.1002/crat.201400484

[5] K. Mahmood and S. Park, Growth and conductivity enhancement of N-doped ZnO nanorod arrays, J. Cryst., Growth 347 (2012) 104-112.

DOI: 10.1016/j.jcrysgro.2012.03.033

[6] N. Rana, S. Chand and A. Gathania, Band gap engineering of ZnO by doping with Mg, Phys. Scr., 90 (2015) 085502.

DOI: 10.1088/0031-8949/90/8/085502

[7] C. Kung, S. Young and M. Kao, Thickness effect of sputtered ZnO seed layer on the electrical properties of Li-doped ZnO nanorods and application on the UV photodetector, IEEE 5th International Nanoelectronics Conference (INEC) Singapore, (2013).

DOI: 10.1109/inec.2013.6466065

[8] M. Kim and Y. Kwon, Semiconductor CdO as a Blocking Layer Material on DSSC Electrode: Mechanism and Application, J. Phys. Chem. C, 113 (2009) 17176-17182.

DOI: 10.1021/jp904206a

[9] J. LaForge and M. Brett, Fabrication of Highly Porous Zinc and Zinc Oxide Nanostructures, Materials Research Society Proceedings (2008) 1142-JJ05-37.

DOI: 10.1557/proc-1142-jj05-37

[10] T. Mchedlidze and J. Weber, Radial distribution of iron in silicon crystals grown by Czochralski method from contaminated feedstock, Phys. Status Solidi RRL 8 – Rap. Res. Lett., 3 (2014) 228-230.

DOI: 10.1002/pssr.201308327

[11] A. Ahnood, Y. Suzuki, A. Madan and A. Nathan, Pulsed-radio frequency plasma enhanced chemical vapour deposition of low temperature silicon nitride for thin film transistors, Th. Sol. Fil., 520 (2012) 4831-4834.

DOI: 10.1016/j.tsf.2012.03.010

[12] K. Yamamoto, Key Technologies for Next Generation Thin Film Silicon Solar Cells. Thin Film Si Solar Cell Fabricated at Low Temperatures, Hyom. Kaga., 21 (200) 272-277.

DOI: 10.1380/jsssj.21.272

[13] W. Q.Wu, B. X. Lei, , H. S. Rao, Y. F. Xu, Y. F. Wang, C. Y. Su, and D. B. Kuang, Hydrothermal Fabrication of Hierarchically Anatase TiO2 Nanowire Arrays on FTO Glass for Dye-Sensitized Solar Cells, Scient. Rep., 3 (2013) 1352.

DOI: 10.1038/srep01352

[14] N. Asim, S. Ahmadi, M. A. Alghoul, F. Y. Hammadi, K. Saeedfar and K. Sopian1, Research and development aspects on chemical preparation techniques of photoanodes for dye sensitized solar cells, Internat. J. Photoener., (2014) 518156.

DOI: 10.1155/2014/518156

[15] C. Yoon and S. Kang, Synthesis of Zn2− xMn xSiO4 phosphors using a hydrothermal technique, J. Mater. Res., 16, (2001) 1210-1216.

[16] S. Denchitcharoen, N. Siriphongsapak and P. Limsuwan, Growth of ZnO nanosheets by hydrothermal method on ZnO seed layer coated by spin-coating technique, Materials Today: Proceedings 4, (2017) 6146-6152.

DOI: 10.1016/j.matpr.2017.06.108

[17] K. Byrappa and M. Yoshimura, Handbook of hydrothermal technology, second ed., William Andrew Publishing, Oxford, (2013).

[18] V. Georgieva, A. Tanusevski and M. Georgieva, Low Cost Solar Cells Based on Cuprous Oxide, in Prof. L. A. Kosyachenko (Ed.), Thin-Film Technologies, INTECH Open Access Publisher, (2011).

DOI: 10.5772/19693

[19] K. Mahmood and S. Park, Highly efficient dye-sensitized solar cell with an electrostatic spray deposited upright-standing boron-doped ZnO (BZO) nanoporous nanosheet-based photoanode, J. Mater. Chem. A, 1 (2013) 4826-4835.

DOI: 10.1039/c3ta10587c

[20] K. Mahmood, D. Song and S. Park, Effects of thermal treatment on the characteristics of boron and tantalum-doped ZnO thin films deposited by the electrospraying method at atmospheric pressure, Surf. Coat. Technol., 206 (2012) 4730-4740.

DOI: 10.1016/j.surfcoat.2012.01.047

[21] S. Duo, Y. Li, Z. Liu, R. Zhong, T. Liu, H. Xu, Preparation of ZnO from 2 D nanosheets to diverse 1 D nanorods and their structure, surface area, photocurrent, optical and photocatalytic properties by simple hydrothermal synthesis, J. Alloys Compd., 695 (2017).

DOI: 10.1016/j.jallcom.2016.11.162

[22] K. Mahmood, H.W. Kang, R. Munir and H.J. Sung, A dual-functional double-layer film with indium-doped ZnO nanosheets/nanoparticles structured photoanodes for dye-sensitized solar cells, RSC Adv., 3 (2013) 25136-25144.

DOI: 10.1039/c3ra43643h