Enhanced Mobility CsPbI3 Quantum Dot Arrays for Record-Efficiency, High-Voltage Photovoltaic Cells

Erin M. Sanehira, Ashley R. Marshall, Jeffrey A. Christians, Steven P. Harvey, Peter N. Ciesielski, Lance M. Wheeler, Philip Schulz, Lih Y. Lin, Matthew C. Beard, Joseph M. Luther

Research output: Contribution to journalArticlepeer-review

797 Scopus Citations

Abstract

We developed lead halide perovskite quantum dot (QD) films with tuned surface chemistry based on A-site cation halide salt (AX) treatments. QD perovskites offer colloidal synthesis and processing using industrially friendly solvents, which decouples grain growth from film deposition, and at present produce larger open-circuit voltages (VOC’s) than thin-film perovskites. CsPbI3 QDs, with a tunable bandgap between 1.75 and 2.13 eV, are an ideal top cell candidate for all-perovskite multijunction solar cells because of their demonstrated small VOC deficit. We show that charge carrier mobility within perovskite QD films is dictated by the chemical conditions at the QD-QD junctions. The AX treatments provide a method for tuning the coupling between perovskite QDs, which is exploited for improved charge transport for fabricating high-quality QD films and devices. The AX treatments presented here double the film mobility, enabling increased photocurrent, and lead to a record certified QD solar cell efficiency of 13.43%.

Original languageAmerican English
Article numbereaao4204
Number of pages8
JournalScience Advances
Volume3
Issue number10
DOIs
StatePublished - 2017

Bibliographical note

Publisher Copyright:
Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science.

NREL Publication Number

  • NREL/JA-5K00-68723

Keywords

  • perovskites
  • quantum dots
  • surface chemistry

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