Improving the performance of PbS quantum dot solar cells by optimizing ZnO window layer

Xiaokun Yang, Long Hu, Hui Deng, Keke Qiao, Chao Hu, Zhiyong Liu, Shengjie Yuan, Jahangeer Khan, Dengbing Li, Jiang Tang, Haisheng Song*, Chun Cheng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
1 Downloads (Pure)

Abstract

Comparing with hot researches in absorber layer, window layer has attracted less attention in PbS quantum dot solar cells (QD SCs). Actually, the window layer plays a key role in exciton separation, charge drifting, and so on. Herein, ZnO window layer was systematically investigated for its roles in QD SCs performance. The physical mechanism of improved performance was also explored. It was found that the optimized ZnO films with appropriate thickness and doping concentration can balance the optical and electrical properties, and its energy band align well with the absorber layer for efficient charge extraction. Further characterizations demonstrated that the window layer optimization can help to reduce the surface defects, improve the heterojunction quality, as well as extend the depletion width. Compared with the control devices, the optimized devices have obtained an efficiency of 6.7% with an enhanced Voc of 18%, Jsc of 21%, FF of 10%, and power conversion efficiency of 58%. The present work suggests a useful strategy to improve the device performance by optimizing the window layer besides the absorber layer.

Original languageEnglish
Article number24
Pages (from-to)1-10
Number of pages10
JournalNano-Micro Letters
Volume9
Issue number2
DOIs
Publication statusPublished - Apr 2017
Externally publishedYes

Bibliographical note

Copyright the Author(s) 2017. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • ZnO
  • window layer
  • thin film solar cells
  • PbS quantum dots
  • physical mechanism

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