Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803785
Keywords
charge recombination; CsPbIBr2; high efficiency; inorganic perovskite solar cells; interface modification
Categories
Funding
- National Natural Science Foundation of China [21805274, 61674098]
- Doctor Startup Foundation of Liaoning Province [20180540099]
- 111 Project [B1404]
- National Key Research Program of China [2016YFA0202403]
- Chinese National 1000-Talent-Plan program [111001034]
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Inorganic cesium lead halide perovskite solar cells (PSCs) have received enormous attention due to their excellent stability compared with that of their organic-inorganic counterparts. However, the lack of optimization strategies leads the inorganic PSCs to suffer from low efficiency arising from significant recombination. To overcome this dilemma, a surface modification of the electron transport layer (ETL)/perovskite interface is undertaken by using SmBr3 to improve the crystallization and morphology of the perovskite layer for enhanced ETL/perovskite interface interaction. Encouragingly, a gradient energy band is created at the interface with an outstanding hole blocking effect. As a result, both the charge recombination occurring at the interface and the nonradiative recombination inside the perovskite are suppressed, and, simultaneously, the charge extraction is improved successfully. Therefore, the power conversion efficiency of the CsPbIBr2 PSCs is increased to as high as 10.88% under one sun illumination, which is 30% higher than its counterparts without the modification. It is logically inferred that this valuable optimization strategy can be extended to other analogous structures and materials.
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