Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 21, Pages 23984-23994Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04938
Keywords
CsPbIBr2; all-inorganic; perovskite solar cells; functional doping; mixed halide
Funding
- Australian Research Council [DP150104365, DP160104835]
- National Natural Science Foundation of China [21908106, 21878158, 21576135]
- Jiangsu Natural Science Foundation [BK20170043, BK20190682]
- Program for Jiangsu Specially Appointed Professors
- State Key Laboratory of Materials-Oriented Chemical Engineering [ZK201808]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Although organic inorganic halide perovskite solar cells (PSCs) have shown dramatically enhanced power conversion efficiencies (PCEs) in the last decade, their long-term stability is still a critical challenge for commercialization. To address this issue, tremendous research efforts have been devoted to exploring all-inorganic PSCs because of their intrinsically high structural stability. Among them, CsPbIBr2-based allinorganic PSCs have drawn increasing attention owing to their suitable band gap and favorable stability. However, the PCEs of CsPbIBr2-based PSCs are still far from those of their organic inorganic counterparts, thus inhibiting their practical applications. Herein, we demonstrate that by simply doping an appropriate amount of Cu2+ into a CsPbIBr2 perovskite lattice (0.5 at. % to Pb2+), the perovskite crystallinity and grain size are increased, the perovskite film morphology is improved, the energy level alignment is optimized, and the trap density and charge recombination are reduced. As a consequence, a decent PCE improvement from 7.81 to 10.4% is achieved along with an enhancement ratio of 33% with a CsPbIBr2-based PSC. Furthermore, the long-term stability of CsPbIBr2\-based PSCs against moisture and heat also remarkably improved by Cu2+ doping. This work provides a facile and effective route to improve the PCE and long-term stability of CsPbIBr2-based all-inorganic PSCs.
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