Hybrid Silicon Nanocone鈥揚olymer Solar Cells

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• 作者：Sangmoo Jeong ; Erik C. Garnett ; Shuang Wang ; Zongfu Yu ; Shanhui Fan ; Mark L. Brongersma ; Michael D. McGehee ; Yi Cui
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：June 13, 2012
• 年：2012
• 卷：12
• 期：6
• 页码：2971-2976
• 全文大小：342K
• 年卷期：v.12,no.6(June 13, 2012)
• ISSN：1530-6992

文摘

Recently, hybrid Si/organic solar cells have been studied for low-cost Si photovoltaic devices because the Schottky junction between the Si and organic material can be formed by solution processes at a low temperature. In this study, we demonstrate a hybrid solar cell composed of Si nanocones and conductive polymer. The optimal nanocone structure with an aspect ratio (height/diameter of a nanocone) less than two allowed for conformal polymer surface coverage via spin-coating while also providing both excellent antireflection and light trapping properties. The uniform heterojunction over the nanocones with enhanced light absorption resulted in a power conversion efficiency above 11%. Based on our simulation study, the optimal nanocone structures for a 10 渭m thick Si solar cell can achieve a short-circuit current density, up to 39.1 mA/cm², which is very close to the theoretical limit. With very thin material and inexpensive processing, hybrid Si nanocone/polymer solar cells are promising as an economically viable alternative energy solution.

Keywords:

Nanotexture; solar cell; heterojunction; conductive polymer; light trapping