Heterogeneous Supersaturation in Mixed Perovskites
Abstract
Thin‐film solar cells based on hybrid lead halide perovskites have achieved certified power conversion efficiencies exceeding 24%, approaching those of crystalline silicon. This motivates deeper studies of the mechanisms that determine their performance. Twin defect sites have been proposed as a source of traps in perovskites, yet their origin and influence on photovoltaic performance remain unclear. It is found that twin defects—observed herein via both transmission electron microscopy and X‐ray diffraction—are correlated with the amount of antisolvent added to the perovskite and that twin defects in the highest‐performing perovskite photovoltaics are suppressed. Heterogeneous supersaturation nucleation is discussed as a contributor to efficient perovskite‐based optoelectronic devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 08, 2020
- Source ID
- 10.1002/advs.201903166
Entities
People
- Andrew H. Proppe
- Chih Shan Tan
- Edward H. Sargent
- Grant Walters
- Lih Juann Chen
- Makhsud I Saidaminov
- Mingyang Wei
- Petar Todorović
- Shana O. Kelley
- Yi Hou
- Yicheng Zhao
- Yongbiao Zhao
- Yu Sheng Huang
- Ziyun Wang
Organizations
- National Science and Technology Council
- National Tsing Hua University
- Natural Sciences and Engineering Research Council
- Office of Naval Research
- University of Toronto
- University of Victoria