期刊
DALTON TRANSACTIONS
卷 51, 期 36, 页码 13919-13927出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2dt00966h
关键词
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资金
- National Natural Science Foundation of China [11774293, 12074321]
- Fundamental Research Funds for the Central Universities [SWU118105]
- Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies [JJNY201905]
The article introduces a simple method to improve the performance of Q-2D perovskite solar cells by adding 3D perovskite powder to the precursor solution. This enables the formation of a uniform and closely connected heterostructure with distributed large-n phases, thereby promoting charge transfer.
Quasi two-dimensional (Q-2D) perovskite cells have attracted much attention due to their excellent stability compared to their 3D counterparts. However, the Q-2D perovskite thin films prepared by the solution method have been confirmed to be a mixture of small-n phases and large-n phases instead of a pure phase, where the amount and distribution of these phases have a great significance on the performance of Q-2D perovskite solar cells. Here, commercialized 3D perovskite powder was simply added to an ACI perovskite precursor solution to get a uniform and closely connected heterostructure in which the large-n phases can work as pathways for charge transfer. The characterization results of the films and devices show that the appropriate amount of MAPbI(3) in the precursor solution could distribute the 3D phases homogeneously within the final film to promote the photovoltaic performance of the devices. Consequently, the power conversion efficiency of the Q-2D ACI perovskite solar cell has been increased from 10.4% to 13.82% (with a 32.8% performance improvement).
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