Journal
ADVANCED SCIENCE
Volume 7, Issue 12, Pages -Publisher
WILEY
DOI: 10.1002/advs.202000480
Keywords
broad tolerance window; eliminate miscellaneous phase; microwave annealing process; perovskite solar cells; rapid annealing period
Categories
Funding
- National Key Research and Development Program of China [2017YFE0131900, 2017YFB0404500]
- Major Program of National Natural Science Foundation of China [91833306, 91733302]
- Taicang Innovation Leading Institute Project [TC2018DYDS24]
- Australian government through the Australian Renewable Energy Agency (ARENA)
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Rapid processing technologies of perovskite solar cells (PSCs) offer an exciting approach to raise the rate of production. Herein, a rapid microwave-annealing process (MAP) is reported to replace the traditional hotplate annealing process (HAP) and the processing period of perovskite is reduced to less than 1 min. Benefiting from the penetrability and simultaneity of microwave irradiation, the MAP method can effectively eliminate miscellaneous phases and thus achieve >1 mu m large-size crystal grains in perovskite films. These MAP treated perovskite films exhibit pure crystalline phase, long charge-carrier lifetime, and low defect density, which can substantially improve the PSC efficiency without requiring an additional enhancer/passivation layer. The inverted planar PSCs present enhanced power conversion efficiency from 18.33% (HAP) to 21.59% (MAP) and good stability of >1000 h lifetime without encapsulation under ambient conditions. In addition, MAP can be applied to a large-size (10 cm x 10 cm) perovskite film fabrication as well as a broader tolerance in environmental temperature and precursor concentration, making it a reliable method for repeatably practical fabrication of perovskite photovoltaics.
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