Enhancing the efficiency and stability of PbS quantum dot solar cells through engineering an ultrathin NiO nanocrystalline interlayer

Shanqin Liu, Long Hu, Shujuan Huang, Wanqing Zhang, Jingjing Ma, Jichao Wang, Xinwei Guan, Chun-Ho Lin, Jiyun Kim, Tao Wan, Qi Lei, Dewei Chu, Tom Wu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Significant progress in PbS quantum dot solar cells has been achieved through designing device architecture, engineering band alignment, and optimizing the surface chemistry of colloidal quantum dots (CQDs). However, developing a highly stable device while maintaining the desirable efficiency is still a challenging issue for these emerging solar cells. In this study, by introducing an ultrathin NiO nanocrystalline interlayer between Au electrodes and the hole-transport layer of the PbS-EDT, the resulting PbS CQD solar cell efficiency is improved from 9.3 to 10.4% because of the improved hole-extraction efficiency. More excitingly, the device stability is significantly enhanced owing to the passivation effect of the robust NiO nanocrystalline interlayer. The solar cells with the NiO nanocrystalline interlayer retain 95 and 97% of the initial efficiency when heated at 80 °C for 120 min and treated with oxygen plasma irradiation for 60 min, respectively. In contrast, the control devices without the NiO nanocrystalline interlayer retain only 75 and 63% of the initial efficiency under the same testing conditions.

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Original languageEnglish
Pages (from-to)46239-46246
Number of pages8
JournalACS Applied Materials and Interfaces
Volume12
Issue number41
DOIs
Publication statusPublished - 14 Oct 2020

Keywords

  • colloidal quantum dot
  • NiO nanocrystalline
  • solar cell
  • ultrathin interlayer
  • device stability

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