title: PbS/Cd₃P₂ quantum heterojunction colloidal quantum dot solar cells.
abstract: Here, we demonstrated the quantum heterojunction colloidal quantum dot (CQD) solar cells employing the PbS CQDs/Cd3P2 CQDs architecture in which both the p-type PbS and n-type Cd3P2 CQD layers are quantum-tunable and solution-processed light absorbers. We synthesized well-crystallized and nearly monodispersed tetragonal Cd3P2 CQDs and then engineered their energy band alignment with the p-type PbS by tuning the dot size and hence the bandgap to achieve efficient light absorbing and charge separation. We further optimized the device through the Ag-doping strategy of PbS CQDs that may leverage an expanded depletion region in the n-layer, which greatly enhances the photocurrent. The resulting devices showed an efficiency of 1.5%.
authors.affiliation: School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Rd., Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Hefeng
authors.initials: H
authors.lastname: Cao
authors.forename: Zeke
authors.initials: Z
authors.lastname: Liu
authors.forename: Xiangxiang
authors.initials: X
authors.lastname: Zhu
authors.forename: Jun
authors.initials: J
authors.lastname: Peng
authors.forename: Long
authors.initials: L
authors.lastname: Hu
authors.forename: Songman
authors.initials: S
authors.lastname: Xu
authors.forename: Miao
authors.initials: M
authors.lastname: Luo
authors.forename: Wanli
authors.initials: W
authors.lastname: Ma
authors.forename: Jiang
authors.initials: J
authors.lastname: Tang
authors.forename: Huan
authors.initials: H
authors.lastname: Liu