Premium
Ion Migration‐Induced Amorphization and Phase Segregation as a Degradation Mechanism in Planar Perovskite Solar Cells
Author(s) -
Di Girolamo Diego,
Phung Nga,
Kosasih Felix Utama,
Di Giacomo Francesco,
Matteocci Fabio,
Smith Joel A.,
Flatken Marion A.,
Köbler Hans,
Turren Cruz Silver H.,
Mattoni Alessandro,
Cinà Lucio,
Rech Bernd,
Latini Alessandro,
Divitini Giorgio,
Ducati Caterina,
Di Carlo Aldo,
Dini Danilo,
Abate Antonio
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202000310
Subject(s) - perovskite (structure) , halide , materials science , photocurrent , photovoltaics , crystallinity , ion , iodide , phase (matter) , optoelectronics , biasing , photovoltaic system , chemical physics , inorganic chemistry , crystallography , chemistry , voltage , physics , organic chemistry , quantum mechanics , ecology , composite material , biology
The operation of halide perovskite optoelectronic devices, including solar cells and LEDs, is strongly influenced by the mobility of ions comprising the crystal structure. This peculiarity is particularly true when considering the long‐term stability of devices. A detailed understanding of the ion migration‐driven degradation pathways is critical to design effective stabilization strategies. Nonetheless, despite substantial research in this first decade of perovskite photovoltaics, the long‐term effects of ion migration remain elusive due to the complex chemistry of lead halide perovskites. By linking materials chemistry to device optoelectronics, this study highlights that electrical bias‐induced perovskite amorphization and phase segregation is a crucial degradation mechanism in planar mixed halide perovskite solar cells. Depending on the biasing potential and the injected charge, halide segregation occurs, forming crystalline iodide‐rich domains, which govern light emission and participate in light absorption and photocurrent generation. Additionally, the loss of crystallinity limits charge collection efficiency and eventually degrades the device performance.