Journal
ADVANCED SCIENCE
Volume 9, Issue 9, Pages -Publisher
WILEY
DOI: 10.1002/advs.202105103
Keywords
combinational passivation; CsPbTh3; efficiency; solar cells; stability
Categories
Funding
- Fundamental Research Funds for the Central Universities, North Minzu University [2021JCYJ08, 2020KYQD31]
- Graduate Innovation Project of North MinzuUniversity [YCX21117]
- Joint Talent Cultivation Funds of NSFC-HN [U1604138]
- National Natural Science Foundation of China [62104006, 62104173]
- National Key Research and Development Program of China [2016YFA0202403]
- DNL Cooperation Fund CAS [DNL180311]
- Chinese National 1000-talent-plan program [1110010341]
- Fundamental Research Funds for the Central Universities, Shaanxi Normal University [GK202103113]
- China Postdoctoral Science Foundation [BX2021173]
- Shanxi Science and Technology Department [20201101012]
- UAEU
- Shaanxi Normal University [31S464]
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The all-inorganic perovskite based on triple halide-mixed CsPb(I2.85Br0.149Cl0.001) framework has achieved high black phase stability and photovoltaic efficiency. However, there are still issues such as ion migration, trap-induced nonradiative recombination, and black phase instability. A passivation strategy has been developed to suppress ion migration and reduce traps, resulting in improved power conversion efficiency.
The distorted lead iodide octahedra of all-inorganic perovskite based on triple halide-mixed CsPb(I2.85Br0.149Cl0.001) framework have made a tremendous breakthrough in its black phase stability and photovoltaic efficiency. However, their performance still suffers from severe ion migration, trap-induced nonradiative recombination, and black phase instability due to lower tolerance factor and high total energy. Here, a combinational passivation strategy to suppress ion migration and reduce traps both on the surface and in the bulk of the CsPhTh3 perovskite film is developed, resulting in improved power conversion efficiency (PCE) to as high as 19.37%. The involvement of guanidinium (GA) into the CsPhTh3 perovskite bulk film and glycocyamine (GCA) passivation on the perovskite surface and grain boundary synergistically enlarge the tolerance factor and suppress the trap state density. In addition, the acetate anion as a nucleating agent significantly improves the thermodynamic stability of GA-doped CsPbTh3 film through the slight distortion of PbI6 octahedra. The decreased nonradiative recombination loss translates to a high fill factor of 82.1% and open-circuit voltage (V-OC) of 1.17 V. Furthermore, bare CsPbTh3 perovskite solar cells without any encapsulation retain 80% of its initial PCE value after being stored for one month under ambient conditions.
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