title: Ultra-sensitive tandem colloidal quantum-dot photodetectors.
abstract: The solution-processed PbSe colloidal quantum-dot (CQD) infrared photodetector with tandem architecture is proposed to address the high dark current issue. The electrical transport mechanism in tandem has been fundamentally changed in which the recombination of carriers at an intermediate layer becomes dominant rather than carriers hopping between nearest neighbors in CQD materials. As a result, the tandem photodetector exhibits ultra-high detectivities of 4.7 × 10(13) Jones and 8.1 × 10(13) Jones under 34 μW cm(-2) illumination at 1100 nm, at 275 K and 100 K, respectively.
authors.affiliation: Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA. jianxu@engr.psu.edu.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Jiang
authors.forename: Wenjia
authors.initials: W
authors.lastname: Hu
authors.forename: Chen
authors.initials: C
authors.lastname: Mo
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Wenjun
authors.initials: W
authors.lastname: Zhang
authors.forename: Guanjun
authors.initials: G
authors.lastname: You
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Mahmoud R M
authors.initials: MR
authors.lastname: Atalla
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.forename: Kandhar K
authors.initials: KK
authors.lastname: Kurhade
authors.forename: Jian
authors.initials: J
authors.lastname: Xu