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Challenges and Prospects of Nanopillar-Based Solar Cells



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Nano Res 2009 2 829 843 DOI 10 1007 s12274 009 9091 y Review Article 00829 Challenges and Prospects of Nanopillar Based Solar Cells Zhiyong Fan1 2 3 Daniel J Ruebusch1 2 3 Asghar A Rathore1 2 3 Rehan Kapadia1 2 3 Onur Ergen1 2 3 Paul W Leu1 2 3 and Ali Javey1 2 3 1 Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley CA 94720 USA Berkeley Sensor and Actuator Center University of California at Berkeley Berkeley CA 94720 USA 3 Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA 2 Received 13 September 2009 Revised 26 September 2009 Accepted 26 September 2009 Tsinghua University Press and Springer Verlag 2009 This article is published with open access at Springerlink com ABSTRACT Materials and device architecture innovations are essential for further enhancing the performance of solar cells while potentially enabling their large scale integration as a viable source of alternative energy In this regard tremendous research has been devoted in recent years with continuous progress in the field In this article we review the recent advancements in nanopillar based photovoltaics while discussing the future challenges and prospects Nanopillar arrays provide unique advantages over thin films in the areas of optical properties and carrier collection arising from their three dimensional geometry The choice of the material system however is essential in order to gain the advantage of the large surface interface area associated with nanopillars with the constraints different from those of the thin film devices KEYWORDS Nanopillar based photovoltaics solar cells nanowires NWs Introduction Semiconductor nanowires NWs exhibit unique electrical optical and mechanical properties arising from their miniaturized dimensions and single crystalline structures with tunable atomic composition In the past decade they have been extensively investigated as the building blocks for various technological



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