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Understanding the Influence of Cation and Anion Migration on Mixed‐Composition Perovskite Solar Cells via Transient Ion Drift
Author(s) -
Li Biao,
Kan Chenxia,
Hang Pengjie,
Fang Yanjun,
Zuo Lijian,
Song Lihui,
Zhang Yiqiang,
Yang Deren,
Yu Xuegong
Publication year - 2021
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.202100225
Subject(s) - ion , hysteresis , perovskite (structure) , composition (language) , materials science , transient (computer programming) , chemical physics , instability , chemical engineering , chemistry , crystallography , physics , linguistics , philosophy , organic chemistry , quantum mechanics , computer science , mechanics , engineering , operating system
Ion migration has a significant influence on perovskite solar cells (PSCs), such as inducing hysteresis and long‐term instability problems. Mixed‐composition PSCs demonstrate less hysteresis and better long‐term stability. Nevertheless, the influence of cation and anion migration on reduced hysteresis and better long‐term stability in mixed‐composition PSCs is still poorly understood. Herein, the ion‐migration process in mixed‐composition PSCs is investigated by the transient ion drift (TID) method. Suppressed ion migration for both cations and anions is observed in mixed‐composition PSCs as compared with that of I‐based PSCs. Interestingly, the suppression of anion migration in mixed‐composition PSCs is most notable, that is, ten times smaller than the rate of anion migration in I‐based PSCs. Moreover, the scan‐speed‐dependent hysteresis measurement results are consistent with the migration timescale of the cations. It is inferred that the better long‐term stability of mixed‐composition PSCs predominantly originates from the remarkably suppressed anion migration, whereas the reduced hysteresis originates from the suppressed cation migration. In conclusion, this research provides new insights into the origins of better long‐term stability and reduced hysteresis in mixed‐composition PSCs.