期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 10, 页码 10610-10617出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01593
关键词
CsPbBr3; aqueous solution; improved crystallinity; loading time; stability
资金
- Natural Science Foundation of Shandong Province [ZR2017MB006, ZR2017ZB0315, ZR2017BB027]
- Fundamental Research Funds for the Central Universities [18CX02052A, 18CX02053A, 20CX06004A]
- China Postdoctoral Science Foundation [2020M672163]
- Talent Introduction Program of China University of Petroleum (East China) [ZX20190162]
- Tsingtao Postdoc Program [qdyy20190062]
- Yankuang Group 2019 Science and Technology Program [YKKJ2019AJ05JG-R60]
- Taishan Scholar program of Shandong Province [ts201712019, tsnq201909069]
The study introduces a modified two-step spin-coating method to prepare CsPbBr3 films using water as the solvent, achieving a maximum PCE of 9.14% in 15 seconds. The devices also show superior stability with a high fill factor and slightly decreased PCEs under humidity and high temperature conditions during a 30-day aging test.
Due to their superior stability and high open-circuit voltage (V-oc), all-inorganic cesium lead bromine (CsPbBr3) perovskite solar cells are attractive for tandem device applications. However, the current methanol fabrication process requires multistep (at least 5-6 times) spin coating, which is tedious and time-consuming. Here, we introduced a modified two-step spin-coating method to prepare the CsPbBr3 films. Water, instead of methanol, has been selected as the solvent for CsBr. Via precisely controlling the loading time (t) of CsBr aqueous solution on the PbBr2 film surface, the prepared films can be tuned from a CsPbBr3@CsPb2Br5 phase (t < 15 s) to a well-crystallized CsPbBr3 phase (t similar to 15 s) and finally the CsPbBr3@Cs4PbBr6 phase (t > 15 s). With a loading time of 15 s, we yield a maximum power conversion efficiency (PCE) of 9.14%, which is comparable with the devices fabricated from the methanol process. In addition, a high fill factor (FF) of 0.84 with a PCE of 9.02% has been obtained, which is among the highest FF reported for CsPbBr3 devices. Moreover, the devices hold superior stability with their PCEs slightly dropped under humidity and high temperature during a 30 day aging test. Overall, this facile and simple fabrication method reported in this work shows great potential for practical applications in the future.
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