The commercial viability of all-small-molecule (ASM) organic solar cells (OSCs) requires high efficiency, long-term stability, and low-cost production. However, satisfying all these factors at the same time remains highly challenging. Herein, a volatile solid additive, namely, 1,8-dichloronaphthalene (DCN) is demonstrated to simultaneously enhance the power conversion efficiency (PCE) and the storage, thermal as well as photo stabilities of oligothiophene ASM-OSCs with concise and low-cost syntheses. The improved PCEs are mainly due to the DCN-induced morphology control with improved exciton dissociation and reduced non-geminate recombination. Notably, the PCE of 16.0% stands as the best value for oligothiophene ASM-OSCs and is among the top values for all types of binary ASM-OSCs. In addition, devices incorporating DCN have shown remarkable long-term stability, retaining over 90% of their initial PCE after dark storage aging of 3000 h and thermal or light stressing of 500 h. The findings demonstrate that the volatile-solid-additive strategy can be a simple yet effective method of delivering highly efficient and stable oligothiophene ASM-OSCs with excellent commercial viability.
|Original language||English (US)|
|Journal||Advanced Functional Materials|
|State||Published - Dec 7 2022|
Bibliographical noteKAUST Repository Item: Exported on 2022-12-09
Acknowledged KAUST grant number(s): OSR-CARF/CCF-3079
Acknowledgements: This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Research Administration (ORA) under Award No: OSR-CARF/CCF-3079. S.L. thanks the research grant from the National Youth Thousand Program Project (R52A199Z11), Chongqing Funds for Distinguished Young Scientists (cstc2020jcyj-jqX0018), Chongqing talent plan (CQYC201903008) and General Program of National Natural Science Foundation of China (62074149). D.H. thanks for the research grant from Chongqing Funds for Natural Science Foundation (cstc2021jcyj-msxmX0239). C.E.P. acknowledges support by the KAUST Global Fellowship Program, under the auspice of the Vice President for Research.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics