Rapid microwave-annealing process of hybrid perovskites to eliminate miscellaneous phase for high performance photovoltaics

Qing Chen, Taotao Ma, Fangfang Wang, You Liu, Sizhou Liu, Jungan Wang, Zhengchun Cheng, Qing Chang, Rong Yang, Wenchao Huang, Lin Wang, Tianshi Qin, Wei Huang

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

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 µm 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 × 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.

Original languageEnglish
Number of pages9
JournalAdvanced Science
Volume7
Issue number12
DOIs
Publication statusPublished - Jun 2020

Keywords

  • broad tolerance window
  • eliminate miscellaneous phase
  • microwave annealing process
  • perovskite solar cells
  • rapid annealing period

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