title: Solution-processed photodetectors based on organic-inorganic hybrid perovskite and nanocrystalline graphite.
abstract: We present here solution-processed photodetectors based on a methyl ammonium lead iodide perovskite (MAPbI3) and nanocrystalline graphite (NCG) hybrid composite. The highest responsivity of the best MAPbI3/NCG photodetector was 795 mA W(-1) at 500 nm visible light, which is almost twice as high as that of the NCG-free MAPbI3 photodetector (408 mA W(-1)). The enhanced performance of the MAPbI3/NCG photodetector arises from the improved charge extraction at the MAPbI3/NCG interface. The dependence of photodetector performance on the mass percentage of NCG (the ratio of NCG to MAPbI3) in the hybrid materials is also reported here, and is correlated to the fabrication process. Moreover, by comparing the responsivity of the devices with different channel lengths, we show that the performance of hybrid photodetectors can be further tuned by tailoring the channel length.
authors.affiliation: Shenzhen Key Lab of Thin Film Transistor and Advanced Display, Peking University Shenzhen Graduate School, Peking University, Shenzhen, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhonggao
authors.initials: Z
authors.lastname: Xia
authors.forename: Songnan
authors.initials: S
authors.lastname: Du
authors.forename: Fang
authors.initials: F
authors.lastname: Yuan
authors.forename: Zigang
authors.initials: Z
authors.lastname: Li
authors.forename: Zhenjun
authors.initials: Z
authors.lastname: Li
authors.forename: Qing
authors.initials: Q
authors.lastname: Dai
authors.forename: Haolan
authors.initials: H
authors.lastname: Wang
authors.forename: Shiqiang
authors.initials: S
authors.lastname: Luo
authors.forename: Shengdong
authors.initials: S
authors.lastname: Zhang
authors.forename: Hang
authors.initials: H
authors.lastname: Zhou