PbS/Cd3P2 quantum heterojunction colloidal quantum dot solar cells

Hefeng Cao, Zeke Liu, Xiangxiang Zhu, Jun Peng, Long Hu, Songman Xu, Miao Luo, Wanli Ma, Jiang Tang, Huan Liu

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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%.

Original languageEnglish
Article number035401
Pages (from-to)1-7
Number of pages7
JournalNanotechnology
Volume26
Issue number3
DOIs
Publication statusPublished - 23 Jan 2015
Externally publishedYes

Keywords

  • colloidal quantum dot
  • solar cell
  • quantum junction
  • heterojunction

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