Abstract
Energy consumption in the world is increasing rapidly and the supply of fossil fuels will not be able to keep up with the demand for too long. Fortunately, two emerging technologies, photovoltaic (PV) cells and concentrated solar power (CSP), can deliver a large portion of United States’ energy needs in the next 40 years if they are properly developed. In this chapter, first, fundamental mechanisms of how electricity is generated by these two technologies are described. Next, recent developments in the application of nanotechnology for enhancing PV cell performance are presented. Among inexpensive solar cell technologies, copper indium diselenide (CuInSe2 or CIS) based thin film solar cells have achieved solar to electrical conversion efficiency of 19.5 %. However, further improvement of efficiency is needed for them to become competitive with traditional energy sources. Two major efficiency limiting factors are, less than optimal energy band gap and short carrier diffusion length. In our group, we have used nanoscale engineering to develop device designs that would counter these two limiting factors. Specifically, vertically aligned nanowire arrays of CuInSe2 of controllable diameter and length were produced by simultaneously electrodepositing Cu, In, and Se from an acid bath into the pores of anodized aluminum oxide (AAO) formed on top of an aluminum sheet. Ohmic contact to CIS was formed by depositing a 100 nm thick gold layer on top and thus a Schottky diode device of the Au/CIS nanowires/Al configuration was obtained. Analysis of the current–voltage characteristics of these devices yielded higher resistivity than those reported for CIS thin films, as expected from the size-dependent effects. Capacitance–voltage measurements were performed on the diodes to get the estimates of space charge density and the junction potential. Based on these experimental results, a nanowire-based solar cell configuration is proposed and illustrated.
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References
Agar, D. (2005). A description of current technology in solar cells, Department of Physical Chemistry, University of Jyväskylä, Finland
Beach, J. D., & McCandless, B. E. (2007). Materials challenges for CdTe and CuInSe2 photovoltaics. MRS Bulletin, 32, 225–229.
Bhattacharya, R. N. (2002). Electrodeposition of CIGS for solar cells. NREL technical report, No. NREL/TP-590-32775, October 2002 (http://www.nrel.gov/docs/).
Chien-Jung, H., Yan-Kuin, S., Kan-Lin, C., & Lai, M. Y. (2005). Characteristics of copper indium diselenide thin films formed on flexible substrates by electrodeposition. Japanese Journal of Applied Physics, 44, 7795–7800.
Chu, S. Z., Wada, K., Inoue, S., & Todoroki, S. (2002). Fabrication and characteristics of ordered Ni nanostructures on glass by anodization and direct current electrodeposition. Chemical Materials, 14, 4595–4602.
Dhere, N. G., Kadam, A. A., Jahagirdar, A. H., Kulkarni, S. S., Pethe, S. A., Vasekar, P. S., Shirolikar, J. S., & Hadagali, V. V. (2006). Proceedings of the IEEE SOUTHEASTCON 2006, IEEE SOUTHEASTCON, v 2006 (pp. 338).
Energy Information Administration, Department of energy. http://www.eia.doe.gov.
Liu, P., Singh, V. P., Rajaputra, S., Phok, S., & Chen, Z. (2010a). Characteristics of copper indium diselenide nanowires embedded in porous alumina templates. Journal of Materials Research, 25, 207–212.
Liu, P., Singh, V. P., & Rajaputra, S. (2010b). Barrier layer non-uniformity effects in anodized aluminum oxide nanopores on ITO substrates. Nanotechnology, 21, 115303.
McClure, J. C., Singh, V. P., Lush, G. B., Clark, E., & Thompson, G. W. (1998). Thin-film solar cells for space and terrestrial applications. Solar Energy Materials and Solar Cells, 55, 141–148.
Phok, S., Rajaputra, S., & Singh, V. P. (2007). Copper indium diselenide nanowire arrays by electrodeposition in porous alumina templates. Nanotechnology, 18, 475601.
Ramanathan, K., Contreras, M. A., Perkins, C. L., Asher, S., Hasoon, F. S., Keane, K., et al. (2003). Properties of 19.2% efficiency ZnO/CdS/CuInGaSe2. Thin-Film Solar Cells, 11, 225.
Singh, V. P., Linam, D. L., Dils, D. W., McClure, J. C., & Lush, G. B. (2000). Electro-optical characterization and modeling of thin film CdS-CdTe heterojunction solar cells. Solar Energy Materials and Solar Cells, 63, 445–466.
Singh, V. P., Rajaputra, S., Liu, P., Phok, S., & Guduru, S. (2008). Fabrication and characterization of CdS/CIS nanowire heterojunctions. 33rd IEEE PVSC conference Proceedings, San Diego.
Sudo, Y., Endo, S., & Irie, T. (1993). Preparation and characterization of electrodeposited CuInSe2 thin films. Japanese Journal of Applied Physics, 32, 1562–1567.
Sze, S. M. (1981). Physics of semiconductor devices (p. 81). New York: Wiley.
Xu, C., Li, H., Zhao, G., & Li, H. (2006). Electrodeposition and magnetic properties of Ni nanowire arrays on anodic aluminum oxide/Ti/Si substrate. Applied Surface Science, 253, 1399–1403.
Xuanzhi, W. (2004). High-efficiency polycrystalline CdTe thin-film solar cells. Solar Energy, 77(6), 803–814.
Yong, S., Jin, Z., Li, C., An, H., & Qiu, J. (2007). Effects of post-heat treatment on the characteristics of chalcopyrite CuInSe2 film deposited by successive ionic layer absorption and reaction method. Thin Solid Films, 515(7–8), 3339–3343.
Zweibel, K., Mason, J., & Fthenakis, V. (2007). A solar grand plan. Scientific American, 298, 64–73.
Acknowledgments
This work was supported in part by grants from National Science Foundation (NSF-NIRT- ECS-0609064), NSF-EPSCoR (EPS-0447479) and Kentucky Science and Engineering Foundation (KSEF – 148-502-02-27 and KSEF-148-502-03-68).
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Liu, P., Gibson, G., Jarro, C.A., Rajaputra, S., Singh, V. (2013). Nanoscale Engineering Approach for Enhancing the Performance of Photovoltaic Cell Technologies for Non-Fossil Energy Sources. In: Jawahir, I., Sikdar, S., Huang, Y. (eds) Treatise on Sustainability Science and Engineering. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6229-9_12
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