Journal
CHEMICAL ENGINEERING JOURNAL
Volume 426, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131583
Keywords
Non-fullerene OSCs; Surface modification; 2-(Dimethylamino) ethyl methacrylate; (DMAEMA); SnO2; Work function
Categories
Funding
- National Natural Science Foundation of China [51673139, 91633301]
- Priority Academic Program Development of Jiangsu Higher Education Institutions, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
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By modifying SnO2 films with DMAEMA, the energy level regulation and stability of OSCs based on PM6:Y6 were improved, resulting in an increase in power conversion efficiency and maintaining a high level of performance even after long-term storage.
In order to regulate the energy level of SnO2 films, we currently in this study employed a non-conjugated small molecule 2-(Dimethylamino) ethyl methacrylate (DMAEMA) to modify SnO2 films, which are applied as electron transportation layers in inverted non-fullerene organic solar cells (OSCs). It is demonstrated that an ultra-thin layer of DMAEMA can efficiently reduce the work function of SnO2 due to the formation of surface dipoles. The optimized PCE of OSCs based on photoactive materials PM6:Y6 increased from 13.80% to 15.45% after the SnO2 films being modified with DMAEMA. More importantly, the OSCs with DMAEMEA-modified SnO2 showed an extremely excellent stability, and the unencapsulated devices maintained 95% of the initial PCE after being stored in Nitrogen for 960 h. To the best of our knowledge, the average decay rate of normalized PCE is the smallest among the up-to-date reported studies.
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