Colloidal Quantum Dot Photovoltaics Enhanced by Perovskite Shelling

Zhenyu Yang, Alyf Janmohamed, Xinzheng Lan, F. Pelayo Garcia de Arquer, Oleksandr Voznyy, Emre Yassitepe, Gi-Hwan Kim, Zhijun Ning, Xiwen Gong, Riccardo Comin, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

141 Scopus citations

Abstract

Solution-processed quantum dots are a promising material for large-scale, low-cost solar cell applications. New device architectures and improved passivation have been instrumental in increasing the performance of quantum dot photovoltaic devices. Here we report photovoltaic devices based on inks of quantum dot on which we grow thin perovskite shells in solid-state films. Passivation using the perovskite was achieved using a facile solution ligand exchange followed by postannealing. The resulting hybrid nanostructure created a more intrinsic CQD film, which, when incorporated into a photovoltaic device with graded bandstructure, achieved a record solar cell performance for single-step-deposited CQD films, exhibiting an AM1.5 solar power conversion efficiency of 8.95%.
Original languageEnglish (US)
Pages (from-to)7539-7543
Number of pages5
JournalNano Letters
Volume15
Issue number11
DOIs
StatePublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Materials Science(all)
  • Chemistry(all)
  • Mechanical Engineering
  • Condensed Matter Physics

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