Improving Charge Transport via Intermediate-Controlled Crystal Growth in 2D Perovskite Solar Cells

Kai Zhu, Liguo Gao, Fei Zhang, Chuanxiao Xiao, Xihan Chen, Bryon Larson, Alan Sellinger, Joseph Berry

Research output: Contribution to journalArticlepeer-review

104 Scopus Citations

Abstract

Reduced-dimensional hybrid perovskite semiconductors have recently attracted significant attention due to their promising stability and optoelectronic properties. However, the issue of poor charge transport in 2D perovskites limits its application. Here, studies on intermediate-controlled crystal growth are reported to improve charge carrier transport in 2D perovskite thin films. It is shown that the coordination strength of solvents with perovskite precursor affects the initial state of intermediate phase formation as well as the subsequent perovskite layer growth. Tuning the solvent composition with a mixture (5:5) of dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) leads to the growth of highly orientated 2D perovskite films with much-improved optoelectronic properties (faster transport by ≈50x, longer carrier lifetime by ≈4x, and lower defect density by ≈30x) than the film prepared with pure DMF. Consequently, perovskite solar cells based on DMF/DMSO (5:5) show >80% efficiency improvement than the devices based on pure DMF.

Original languageAmerican English
Article number1901652
Number of pages7
JournalAdvanced Functional Materials
Volume29
Issue number47
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

NREL Publication Number

  • NREL/JA-5900-73170

Keywords

  • 2D perovskite
  • defect density
  • microwave conductivity
  • solvent
  • transport

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