title: Phase-pure iron pyrite nanocrystals for low-cost photodetectors.
abstract: Earth-abundant iron pyrite (FeS2) shows great potential as a light absorber for solar cells and photodetectors due to their high absorption coefficient (>10(5) cm(-1)). In this paper, high-quality phase-pure and single crystalline pyrite nanocrystals were synthesized via facile, low-cost, and environment friendly hydrothermal method. The molar ratio of sulphur to iron and the reaction time play a crucial role in determining the quality and morphology of FeS2 nanocrystals. X-ray diffraction and high-resolution transmission electron microscopy confirm that phase-pure and single crystalline pyrite nanocrystals can be synthesized with high sulphur to iron molar ratio and sufficient reaction time. For the first time, a crystalline nanogap pyrite photodetector with promising photocurrent and UV-visible photoresponse has been fabricated. This work further demonstrates a facile route to synthesize high-quality FeS2 nanomaterials and their potential in optoelectronic applications.
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
authors.forename: Shenting
authors.initials: S
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
authors.forename: Peng
authors.initials: P
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
authors.forename: Handong
authors.initials: H
authors.lastname: Li
authors.affiliation: Material Sciences and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors.forename: Chih-Chung
authors.initials: CC
authors.lastname: Lai
authors.affiliation: Material Sciences and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors.forename: Yu-Lun
authors.initials: YL
authors.lastname: Chueh
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
authors.forename: Zhiming M
authors.initials: ZM
authors.lastname: Wang
keywords: Hydrothermal; Iron pyrite; Nanocrystal; Photodetector