New Strategies for Defect Passivation in High‐Efficiency Perovskite Solar Cells

Lead halide perovskite solar cells now show excellent efficiencies and encouraging levels of stability. Further improvements in performance require better control of the trap states which are considered to be associated with vacancies and defects at crystallite surfaces. Herein, a reflection on the...

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Bibliographic Details
Published in:Advanced energy materials 2020-04, Vol.10 (13), p.n/a
Main Authors: Akin, Seckin, Arora, Neha, Zakeeruddin, Shaik M., Grätzel, Michael, Friend, Richard H., Dar, M. Ibrahim
Format: Article
Language:English
Subjects:
2D–3D
Cations
Circuits
Control stability
Crystal defects
Crystallites
Current carriers
defects
efficiency
Energy conversion efficiency
engineering
Grain orientation
Lattice vacancies
Lead compounds
Metal halides
mixed‐cation‐halide
passivation
perovskite solar cells
Perovskites
Photovoltaic cells
Solar cells
stability
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Summary:Lead halide perovskite solar cells now show excellent efficiencies and encouraging levels of stability. Further improvements in performance require better control of the trap states which are considered to be associated with vacancies and defects at crystallite surfaces. Herein, a reflection on the ways in which these traps can be mitigated is presented by improving the quality of the perovskite layer and interfaces in fully assembled device configurations. In this review, the most recent design strategies reported in the literature, which have been explored to tune grain orientation, to passivate defects, and to improve charge‐carrier lifetimes, are presented. Specifically, the advances made with single‐cation, mixed‐cation and/or mixed‐halide, and 3D/2D bilayer‐based light absorbers are discussed. The interfacial, compositional, and band alignment engineering along with their consequent effects on the open‐circuit voltage, power conversion efficiency, and stability are a particular focus. Despite the record efficiency exceeding 25%, the long‐term operational stability of perovskite solar cells is limited by the degradation mechanisms accelerated by the presence of vacancies and defects. In this review, recent engineering strategies ranging from grains to interfaces that mitigate degradation and improve efficiencies are discussed.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201903090