Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 4, Pages 4540-4548Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20831
Keywords
inorganic perovskite solar cells; cesium lead bromide; surface defects passivation; ionic liquids; stability
Funding
- Director Foundation from Qingdao National Laboratory for Marine Science and Technology [QNLM201702]
- National Natural Science Foundation of China [61604143, 61774139, U1802257]
- Natural Science Foundation of Guangdong Province [2019B151502061]
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The defect passivation of perovskite films is an efficacious way to further boost the power conversion efficiency (PCE) and long-term stability of perovskite solar cells (PSCs). In this work, ionic liquids (ILs) of 1-butyl-2,3-dimethylimidazolium chloride ([BMMIm]Cl) are used as a modification layer in perovskite films in carbon-based CsPbBr3 PSCs without a hole-transporting material (HTM) for passivating the surface defects. The preliminary results demonstrate that the [BMMIm]Cl modifier passivates the surface defects of the perovskite film and reduces the valence band of perovskite close to the work function of the carbon electrode, which causes a remarkably inhibited nonradiative and radiative charge recombination, improved energy-level matching, and decreased energy loss. After optimization, a champion efficiency of 9.92% with a V-oc as high as 1.61 V is achieved for the [BMMIm]Cl tailored carbon-based CsPbBr3PSC without HTM, which is improved by 61.3% in comparison with 6.15% for the control device. Furthermore, the encapsulation-free PSC presents good long-term stability after storage in an air atmosphere with 70% RH at 20 degrees C or 0% RH at 80 degrees C as well as under continuous illumination conditions for 30 days. The significantly improved PCE and stability in high humidity or temperature suggest that the perovskite passivation by ILs is an effective strategy for fabricating high-PCE and stable PSCs.
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