Heterogeneous Integration of InGaAs Nanowires on the Rear Surface of Si Solar Cells for Efficiency Enhancement

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• 作者：Jae Cheol Shin ; Parsian K. Mohseni ; Ki Jun Yu ; Stephanie Tomasulo ; Kyle H. Montgomery ; Minjoo L. Lee ; John A. Rogers ; Xiuling Li
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：December 21, 2012
• 年：2012
• 卷：6
• 期：12
• 页码：11074-11079
• 全文大小：367K
• 年卷期：v.6,no.12(December 21, 2012)
• ISSN：1936-086X

文摘

We demonstrate energy-conversion-efficiency (畏) enhancement of silicon (Si) solar cells by the heterogeneous integration of an In_xGa_1鈥?i>xAs nanowire (NW) array on the rear surface. The NWs are grown via a catalyst-free, self-assembled method on Si(111) substrates using metalorganic chemical vapor deposition (MOCVD). Heavily p-doped In_xGa_1鈥?i>xAs (x 鈮?0.7) NW arrays are utilized as not only back-reflectors but also low bandgap rear-point-contacts of the Si solar cells. External quantum efficiency of the hybrid In_xGa_1鈥?i>xAs NW-Si solar cell is increased over the entire solar response wavelength range; and 畏 is enhanced by 36% in comparison to Si solar cells processed under the same condition without the NWs.

Keywords:

MOCVD; nanowires; silicon; In_xGa_1鈭?i>xAs; solar cells