| Core-Shell Heterojunction of Silicon Nanowires Array and Carbon Quantum Dots for Photovoltaic Devices and Self-Driven Photodetectors |
Chao Xie, Biao Nie, Long-Hui Zeng, Feng-Xia Liang, Ming-Zheng Wang, Lin-Bao Luo,* Mei Feng, Yong-Qiang Yu, Chun-Yan Wu, Yu-Cheng Wu,* and Shu-Hong Yu*
Abstract:Silicon nanostructure-based solar cells have lately intrigued intensive interest because of their promising potential in next-generation solar energy conversion devices. Herein, we report a silicon nanowire (SiNW) array/carbon quantum dot (CQD) coreshell heterojunction photovoltaic device by directly coating Ag-assisted chemical-etched SiNW arrays with CQDs. The heterojunction with a barrier height of 0.75 eV exhibited excellent rectifying behavior with a rectification ratio of 103 at ±0.8 V in the dark and power conversion efficiency (PCE) as high as 9.10% under AM 1.5G irradiation. It is believed that such a high PCE comes from the improved optical absorption as well as the optimized carrier transfer and collection capability. Furthermore, the heterojunction could function as a high-performance self-driven visible light photodetector operating in a wide switching wavelength with good stability, high sensitivity, and fast response speed. It is expected that the present SiNW array/CQD coreshell heterojunction device could find potential applications in future high-performance optoelectronic devices.
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