Lead-Free Flexible Perovskite Solar Cells with Interfacial Native Oxide Have >10% Efficiency and Simultaneously Enhanced Stability and Reliability

Min Chen, Qingshun Dong, Chuanxiao Xiao, Xiaopeng Zheng, Zhengdong Dai, Yantao Shi, Joseph Luther, Nitin Padture

Research output: Contribution to journalArticlepeer-review

20 Scopus Citations

Abstract

Here we demonstrate an innovative compositional and interfacial engineering approach to achieve Pb-free flexible perovskite solar cells (f-PSCs) with an unprecedented combination of the highest efficiency reported to date (10.43%), together with enhanced operational stability and mechanical reliability. The key to this approach is alloying of an FASnI3 metal halide perovskite (MHP) thin film with Ge2+ to stabilize the Sn2+ oxidation state in the MHP, together with the use of a NiOx hole-transport layer. We show that this results in the in situ formation of a thin amorphous GeO2 native oxide layer at the NiOx/FASn0.9Ge0.1I3 interface. This layer not only passivates that critical interface but also enhances the interfacial mechanical bonding.

Original languageAmerican English
Pages (from-to)2256-2264
Number of pages9
JournalACS Energy Letters
Volume7
Issue number7
DOIs
StatePublished - 8 Jul 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-83146

Keywords

  • efficiency
  • mechanical reliability
  • operational stability
  • perovskite solar cells

Fingerprint

Dive into the research topics of 'Lead-Free Flexible Perovskite Solar Cells with Interfacial Native Oxide Have >10% Efficiency and Simultaneously Enhanced Stability and Reliability'. Together they form a unique fingerprint.

Cite this