Monolayer Perovskite Bridges Enable Strong Quantum Dot Coupling for Efficient Solar Cells

Bin Sun, Andrew Johnston, Chao Xu, Mingyang Wei, Ziru Huang, Zhang Jiang, Hua Zhou, Yajun Gao, Yitong Dong, Olivier Ouellette, Xiaopeng Zheng, Jiakai Liu, Min Jae Choi, Yuan Gao, Se Woong Baek, Frédéric Laquai, Osman M. Bakr, Dayan Ban, Oleksandr Voznyy, F. Pelayo García de ArquerEdward H. Sargent

Research output: Contribution to journalArticlepeer-review

171 Scopus citations

Abstract

Solution-processed colloidal quantum dots (CQDs) are promising photoelectronic materials for next-generation photovoltaic devices; however, efficient charge transport and surface passivation have yet to be successfully combined in CQD solids. Here, we report a new CQD surface engineering strategy that enables the growth of a monolayer of perovskite that bridges neighboring CQDs, breaking this limitation. The monolayer of perovskite increases interdot coupling, reducing the distance over which carriers must tunnel. The new CQD solids provide fully a 3-fold improvement in mobility relative to the best prior well-passivated CQD solids. As a result, we report a power conversion efficiency (PCE) of 13.8%, a record among PbS CQD solar cells. The study offers an avenue to high-quality semiconducting nanocrystal solids for CQD applications including photodetectors, tandem cells, and light-emitting diodes.

Original languageEnglish
Pages (from-to)1542-1556
Number of pages15
JournalJoule
Volume4
Issue number7
DOIs
StatePublished - 15 Jul 2020

Keywords

  • carrier transport
  • monolayer perovskite bridges
  • quantum dots
  • solar cells
  • surface passivation

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