title: Core-shell heterojunction of silicon nanowire arrays and carbon quantum dots for photovoltaic devices and self-driven photodetectors.
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) core-shell 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 10(3) 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 core-shell heterojunction device could find potential applications in future high-performance optoelectronic devices.
authors.affiliation: School of Materials Science and Engineering and ‡School of Electronic Science and Applied Physics, Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology , Hefei 230009, People's Republic of China.
authors.forename: Chao
authors.initials: C
authors.lastname: Xie
authors.forename: Biao
authors.initials: B
authors.lastname: Nie
authors.forename: Longhui
authors.initials: L
authors.lastname: Zeng
authors.forename: Feng-Xia
authors.initials: FX
authors.lastname: Liang
authors.forename: Ming-Zheng
authors.initials: MZ
authors.lastname: Wang
authors.forename: Linbao
authors.initials: L
authors.lastname: Luo
authors.forename: Mei
authors.initials: M
authors.lastname: Feng
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Yu
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Wu
authors.forename: Yucheng
authors.initials: Y
authors.lastname: Wu
authors.forename: Shu-Hong
authors.initials: SH
authors.lastname: Yu