Nano letters | 23 Mar 2013
E Shi, H Li, L Yang, L Zhang, Z Li, P Li, Y Shang, S Wu, X Li, J Wei, K Wang, H Zhu, D Wu, Y Fang and A Cao
Carbon nanotube-Si and graphene-Si solar cells have attracted much interest recently owing to their potential in simplifying manufacturing process and lowering cost compared to Si cells. Until now, the power conversion efficiency of graphene-Si cells remains under 10% and well below that of the nanotube-Si counterpart. Here, we involved a colloidal anti-reflection coating onto a monolayer graphene-Si solar cell, and enhanced the cell efficiency to 14.5% under standard illumination (air mass 1.5, 100 mW/cm2) with a stable anti-reflection effect over long time. The anti-reflection treatment was realized by a simple spin-coating process, which significantly increased the short-circuit current density and the incident photon-to-electron conversion efficiency to about 90% across the visible range. Our results demonstrate a great promise in developing high-efficiency graphene-Si solar cells in parallel to the more extensively studied carbon nanotube-Si structures.
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