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CuI-Si heterojunction solar cells with carbon nanotube films as flexible top-contact electrodes |
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| Authors: | Peixu Li Shanshan Wang Yi Jia Zhen Li Chunyan Ji Luhui Zhang Hongbian Li Enzheng Shi Zuqiang Bian Chunhui Huang Jinquan Wei Kunlin Wang Hongwei Zhu Dehai Wu Anyuan Cao | |
| Affiliation: | 1. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China 2. College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China 3. College of Engineering, Peking University, Beijing, 100871, China 4. Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China |
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| Abstract: | We report the fabrication of CuI-Si heterojunction solar cells with carbon nanotubes (CNTs) as a transparent electrode. A flexible CNT network was transferred onto the top of a polycrystalline CuI layer, making a conformal coating with good contact with the underlying CuI. The solar cells showed power conversion efficiencies in the range of 6% to 10.5%, while the efficiency degradation was less than 10% after the device was stored in air for 8 days. Compared with conventional rigid electrodes such as indium tin oxide (ITO) glass, the flexibility of the CNT films ensures better contact with the active layers and removes the need for press-contact electrodes. Degraded cells can recover their original performance by acid doping of the CNT electrode. Our results suggest that CNT films are suitable electrical contacts for rough materials and structures with an uneven surface.  | |
| Keywords: | Carbon nanotubes flexible electrodes heterojunction solar cells | |
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