Enhanced Near‐Bandgap Response in InP Nanopillar Solar Cells |
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| Authors: | Corsin Battaglia Jingsan Xu Maxwell Zheng Xingtian Yin Mark Hettick Kevin Chen Nancy Haegel Ali Javey |
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| Affiliation: | 1. Electrical Engineering and Computer Sciences Department, University of California Berkeley, Berkeley, CA, USA;2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;3. Physics Department, Naval Postgraduate School, Monterey, CA, USA |
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| Abstract: | The effect of nanopillar texturing on the performance of InP solar cells is investigated. Maskless, lithography‐free reactive ion etching of InP nanopillars improves the open‐circuit voltage, reduces reflectance over a broad spectral range, and enhances the near‐bandgap response compared to a flat, non‐textured cell with comparable reflectance in the infrared. Electron‐beam induced current measurements indicate an increased effective minority carrier collection length. The response at short wavelengths decreases due to the formation of a defective surface layer with strong non‐radiative recombination. Plasma oxidation and wet etching partially restore the blue response resulting in a power conversion efficiency of 14.4%. |
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| Keywords: | InP photovoltaics nanopillars surface recombination reactive ion etching |
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