High performance PbS colloidal quantum dot solar cells by employing solution-processed CdS thin films from a single-source precursor as the electron transport layer

Long Hu, Robert J. Patterson, Yicong Hu, Weijian Chen, Zhilong Zhang, Lin Yuan, Zihan Chen, Gavin J. Conibeer, Gang Wang*, Shujuan Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

CdS thin films are a promising electron transport layer in PbS colloidal quantum dot (CQD) photovoltaic devices. Some traditional deposition techniques, such as chemical bath deposition and RF (radio frequency) magnetron sputtering, have been employed to fabricate CdS films and CdS/PbS CQD heterojunction photovoltaic devices. However, their power conversion efficiencies (PCEs) are moderate compared with ZnO/PbS and TiO2/PbS heterojunction CQD solar cells. Here, efficiencies have been improved substantially by employing solution-processed CdS thin films from a single-source precursor. The CdS film is deposited by a straightforward spin-coating and annealing process, which is a simple, low-cost, and high-material-usage fabrication process compared to chemical bath deposition and RF magnetron sputtering. The best CdS/PbS CQD heterojunction solar cell is fabricated using an optimized deposition and air-annealing process achieved over 8% PCE, demonstrating the great potential of CdS thin films fabricated by the single-source precursor for PbS CQDs solar cells.

Original languageEnglish
Article number1703687
Number of pages7
JournalAdvanced Functional Materials
Volume27
Issue number46
DOIs
Publication statusPublished - 8 Dec 2017
Externally publishedYes

Keywords

  • CdS/PbS heterojunction
  • PbS colloidal quantum dots
  • photovoltaics
  • single-source precursors

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