Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 22, Pages 9689-9695Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c02739
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Funding
- National Natural Science Foundation of China [91733301, 21702069, 51572102, 51972133]
- Fundamental Research Funds for the Central Universities
- Science and Technology Department of Hubei Province [2017AAA190]
- 111 Project [B07038]
- Program for HUST Academic Frontier Youth Team [2016QYTD06]
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The all-inorganic CsPb(IxBr1-x) 3 (0 <= x <= 1) perovskite solar cells (PSCs) are attractive by virtue of their high environmental and thermal stability. Nevertheless, multiple-step deposition and high annealing temperature (>250 degrees C) and the structural and optoelectronic properties changes upon temperature-dependent phase-transition are potential impediments for highly efficient and stable PSCs. Herein, a space-confined method to fabricate stable lower-order symmetric pure monoclinic CsPbBr3 phase at low temperature (<50 degrees C) is for the first time reported. It is found that the carbon-based mesoporous fully printable area can inhibit the phase transition to get a pure phase. Therefore, the device exhibits a power conversion efficiency of 7.52% with a low hysteresis index of 0.024. Moreover, the device passed the 1000 h 85 degrees C thermal test and the 200 cycles thermal cycling test according to IEC-61625 stability tests. These are critical progresses for achieving long-term stability and the stable pure inorganic perovskite phase of high-performance photovoltaics.
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