期刊
ADVANCED MATERIALS
卷 32, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002066
关键词
CsPbI3; hybrid materials; nonfullerene acceptors; organic solar cells; perovskite quantum dots
类别
资金
- NSFC [21673011, 21734001, 51761165023]
- Natural Science Foundation of Shandong Province [ZR2017BEM037]
- China Postdoctoral Science Foundation [2017M612199]
- Postdoctoral Scientific Research Foundation of Qingdao
- NSFC/RGC Joint Research Scheme [N_CUHK418/17]
To take advantages of the intense absorption and fluorescence, high charge mobility, and high dielectric constant of CsPbI(3)perovskite quantum dots (PQDs), PQD hybrid nonfullerene organic solar cells (OSCs) are fabricated. Addition of PQDs leads to simultaneous enhancement of open-circuit voltage (V-OC), short-circuit current density (J(SC)), and fill factor (FF); power conversion efficiencies are boosted from 11.6% to 13.2% for PTB7-Th:FOIC blend and from 15.4% to 16.6% for PM6:Y6 blend. Incorporation of PQDs dramatically increases the energy of the charge transfer state, resulting in near-zero driving force and improvedV(OC). Interestingly, at near-zero driving force, the PQD hybrid OSCs show more efficient charge generation than the control device without PQDs, contributing to enhancedJ(SC), due to the formation of cascade band structure and increased molecular ordering. The strong fluorescence of the PQDs enhances the external quantum efficiency of the electroluminescence of the active layer, which can reduce nonradiative recombination voltage loss. The high dielectric constant of the PQDs screens the Coulombic interactions and reduces charge recombination, which is beneficial for increased FF. This work may open up wide applicability of perovskite quantum dots and an avenue toward high-performance nonfullerene solar cells.
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