High-Efficiency Large-Area Carbon Nanotube-Silicon Solar Cells

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• 作者：Wenjing Xu ; Shiting Wu ; Xinming Li ; Mingchu Zou ; Liusi Yang ; Zelin Zhang ; Jinquan Wei ; Song Hu ; Yanhui Li and Anyuan Cao
• 刊名：Advanced Energy Materials
• 出版年：2016
• 出版时间：June 22, 2016
• 年：2016
• 卷：6
• 期：12
• 全文大小：6502K
• ISSN：1614-6840

文摘

Currently studied carbon nanotube-silicon (CNT-Si) solar cells are based on relatively small active areas (typically <0.15 cm²); increasing the active area generally leads to reduced power conversion efficiencies. This study reports CNT-Si solar cells with active areas of more than 2 cm² for single cells, yet still achieving cell efficiencies of about 10%, which is the first time for CNT-Si solar cells with an active area more than 1 cm² to reach the level for real applications. In this work, a controlled number of flattened highly conductive CNT strips is added, in simple arrangement, to form a CNT-Si solar cell with CNT strips in which the middle film makes heterojunctions with Si while the top strips act as self-similar top electrodes, like conventional metal grids. The CNT strips, directly condensed from as-grown CNT films, not only improve the CNT-Si junctions, but also enhance the conductivity of top electrodes without introducing contact barrier when the CNT strips are added onto the film. This property may facilitate the development of large-area high-performance CNT or graphene-Si solar cells.