Surface-Activated Corrosion in Tin–Lead Halide Perovskite Solar Cells

Laura E. Mundt; Jinhui Tong; Axel F. Palmstrom; Sean P. Dunfield; Kai Zhu; Joseph J. Berry; Laura T. Schelhas; Erin L. Ratcliff

doi:10.1021/acsenergylett.0c01445

journal article·2020-11-13Open access

Surface-Activated Corrosion in Tin–Lead Halide Perovskite Solar Cells

Laura E. Mundt, Jinhui Tong, Axel F. Palmstrom, Sean P. Dunfield, Kai Zhu, Joseph J. Berry, Laura T. Schelhas, Erin L. Ratcliff

ACS Energy Letters· Volume 5· Issue 11

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Source abstract

Abstract

Mixed tin–lead halide perovskite solar cells have promising power conversion efficiencies, but long-term stability is still a challenge. Herein we examine the stability of a 60:40 tin–lead perovskite to better understand diminished device performance upon thermal treatment, both in ambient and inert atmosphere. Operando X-ray diffraction shows a stable bulk structure of the perovskite absorber, leading to the hypothesis that surface chemistry dominates the degradation mechanism. X-ray photoelectron spectroscopy reveals two new observations post-thermal annealing that accompany previously reported Sn4+ evolution: (i) the formation of I3– intermediates preceding I2 loss at the surface and (ii) evidence of under-coordinated tin and lead surface sites (Snδ<2+ and Pbδ<2+, respectively) in inert and ambient conditions. These two species indicate an activated corrosion (i.e., both oxidation and reduction) process at the surface as a possible chemical pathway for degradation, which is expected to be accelerated under operando voltage and light biases.

Source: openalex_inverted_index · Quality: baseline

Research context

Metals & alloys Electronic materials Materials processing

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States

National Renewable Energy Laboratory, 15013 Denver West Pkwy, Golden, Colorado 80401, United States

Materials Science and Engineering Program, University of Colorado Boulder, 027 UCB, Suite N321, Boulder, Colorado 80303, United States

Department of Materials Science and Engineering, University of Arizona, 1235 East James E. Rogers Way, Tucson, Arizona 85721, United States

Department of Chemical and Environmental Engineering, University of Arizona, 1133 East James E. Rogers Way, Tucson, Arizona 85721, United States

Department of Chemistry and Biochemistry, University of Arizona, 1306 East University Blvd., Tucson, Arizona 85721, United States

Funding

Office of Naval Research · Solar Energy Technologies Program

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