title: Interface Engineering To Boost Photoresponse Performance of Self-Powered, Broad-Bandwidth PEDOT:PSS/Si Heterojunction Photodetector.
abstract: Organic-inorganic hybrid heterojunctions are poised to push toward novel optoelectronics applications, such as photodetectors, but significant challenges complicating practical use remain. Although all organic based photodetectors have been reported with great success, their potential in high-speed, broadband, self-powered photodetectors have not been fully explored. Herein, a self-powered, broad bandwidth of photodetector based on
  PSS/Si heterojunction is built by a facial low temperature spin-coating method. By interface engineering of heterojunction with optimal band alignment and heteromicrostructures, enhanced photoresponse performances are obtained. The bandwidth of the hybrid photodetector could be broadened by 10 kHz after interfacial passivation by a methyl group. Further manipulating the geometrical structure of the hybrid heterojunction with silicon nanowire, a broad spectrum response from 300 to 1100 nm, with bandwidth as high as 40.6 kHz, fast response speed of 2.03 μs and high detection of 4.1 × 10(11) Jones under zero bias was achieved. Meanwhile, the close dependence between the photoresponse performance of heterojunctions and Si nanowire length is observed in the top-coverage configuration. Finally, a coverage effects model is proposed based on the competition of Si bulk and surface recombination, which is also confirmed by the designed bottom-coverage experiment. The mechanisms behind the enhanced photoresponse of the hybrid photodetector is attributed to the optimum band alignment, as well as the optimum balance of carrier dissociation and recombination of heterojunction. The scalable and low temperature method would be of great convenience for large-scale fabrication of the
  PSS/Si hybrid photodetector.
authors.affiliation: Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University , Guangzhou 510632, People's Republic of China.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Liang
authors.affiliation: Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University , Guangzhou 510632, People's Republic of China.
authors.forename: Pingyang
authors.initials: P
authors.lastname: Zeng
authors.affiliation: Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University , Guangzhou 510632, People's Republic of China.
authors.forename: Pengyi
authors.initials: P
authors.lastname: Liu
authors.affiliation: Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University , Guangzhou 510632, People's Republic of China.
authors.forename: Chuanxi
authors.initials: C
authors.lastname: Zhao
authors.affiliation: Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University , Guangzhou 510632, People's Republic of China.|Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University , Guangzhou 510632, People's Republic of China.
authors.forename: Weiguang
authors.initials: W
authors.lastname: Xie
authors.affiliation: Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University , Guangzhou 510632, People's Republic of China.|Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University , Guangzhou 510632, People's Republic of China.
authors.forename: Wenjie
authors.initials: W
authors.lastname: Mai
keywords: bandwidth; high-speed; hybrid photodetector; interface engineering; self-powered