Improving Efficiency and Stability of Perovskite Solar Cells Enabled by A Near-Infrared-Absorbing Moisture Barrier

Qin Hu, Wei Chen, Wenqiang Yang, Yu Li, Yecheng Zhou, Bryon Larson, Justin Johnson, Yi-Hsien Lu, Wenkai Zhong, Jinqui Xu, Liana Klivansky, Cheng Wang, Miquel Salmeron, Aleksandra Djurisic, Feng Lui, Zhubing He, Rui Zhu, Thomas Russell

Research output: Contribution to journalArticlepeer-review

88 Scopus Citations

Abstract

Simultaneously improving device efficiency and stability is the most important issue in perovskite solar cell (PSC) research. Here, we strategically introduce a multi-functional interface layer (MFIL) with integrated roles of: (1) electron transport, (2) moisture barrier, (3) near-infrared photocurrent enhancement, (4) trap passivation, and (5) ion migration suppression to enhance the device performance. The narrow-band-gap non-fullerene acceptor, Y6, was screened out to replace the most commonly used PCBM in the inverted PSCs. A significantly improved power conversion efficiency of 21.0% was achieved, along with a remarkable stability (up to 1,700 h) without encapsulation under various external stimuli (light, heat, and moisture). Furthermore, systematic studies of the molecular orientation or passivation and the charge carrier dynamics at the interface between perovskite and MFIL were presented. These results offer deep insights for designing advanced interlayers and establish the correlations between molecular orientation, interface molecular bonding, trap state density, non-radiation recombination, and the device performance.

Original languageAmerican English
Pages (from-to)1575-1593
Number of pages19
JournalJoule
Volume4
Issue number7
DOIs
StatePublished - 15 Jul 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Inc.

NREL Publication Number

  • NREL/JA-5900-76550

Keywords

  • charge carrier dynamics
  • device stability
  • moisture barrier
  • molecular bonding
  • NIR absorption
  • perovskite solar cells
  • solar-photochemistry

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