Vapor phase fabrication of three‐dimensional arrayed BiI3 nanosheets for cost‐effective solar cells
Yiyi Zhu,
Qianpeng Zhang,
Matthew Kam,
Swapnadeep Poddar,
Leilei Gu,
Shijun Liang,
Pengfei Qi,
Feng Miao,
Zhiyong Fan
Affiliations
Yiyi Zhu
HKUST‐Shenzhen Research Institute Shenzhen China
Qianpeng Zhang
HKUST‐Shenzhen Research Institute Shenzhen China
Matthew Kam
HKUST‐Shenzhen Research Institute Shenzhen China
Swapnadeep Poddar
HKUST‐Shenzhen Research Institute Shenzhen China
Leilei Gu
HKUST‐Shenzhen Research Institute Shenzhen China
Shijun Liang
National Laboratory of Solid State Microstructures, School of Physics, School of Electronic Science and Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University Nanjing China
Pengfei Qi
Zhong Shan Rui Ke New Energy Co. Ltd. Zhongshan Guangdong China
Feng Miao
National Laboratory of Solid State Microstructures, School of Physics, School of Electronic Science and Engineering Collaborative Innovation Centre of Advanced Microstructures, Nanjing University Nanjing China
Abstract Multilayered photovoltaic absorbers have triggered widespread attention for their unique structure and properties. However, multilayered materials in the randomly oriented polycrystalline thin‐film lead to ineffective carrier transport and collection, which hinders the process of achieving high‐performance solar cells. Herein, this issue is tackled by producing the three‐dimensional (3D) heterojunction BiI3 nanosheets (NSs) solar cells, which embed vertically aligned monocrystalline BiI3 NSs into spiro‐OMeTAD. The preferred orientation of BiI3 NSs and large p‐n junction areas of 3D heterojunction structure enable a strong light absorption and effective carrier transport and collection, and thus a power conversion efficiency (PCE) of 1.45% was achieved. Moreover, this PCE is the highest ever reported for BiI3 based solar cells to our best knowledge. Moreover, the nonencapsulated device remained 96% of the initial PCE after 24 h continuous one sun illumination at ~70% humidity condition, and 82% of the initial PCE after 1‐month storage at ~30% humidity condition.
