High‐Efficiency Large‐Area Carbon Nanotube‐Silicon Solar Cells |
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| Authors: | Wenjing Xu Shiting Wu Xinming Li Mingchu Zou Liusi Yang Zelin Zhang Jinquan Wei Song Hu Yanhui Li Anyuan Cao |
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| Institution: | 1. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, P. R. China;2. Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China;3. School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Materials Processing Technology of MOE, Tsinghua University, Beijing, P. R. China;4. Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, College of Electromechanical Engineering, Qingdao University, Qingdao, China |
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| Abstract: | 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. |
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| Keywords: | carbon nanotubes solar cells nanotube strips self‐similar electrodes |
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