Journal
ORGANIC ELECTRONICS
Volume 99, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2021.106308
Keywords
Organic solar cell; Ternary; Solvent; Efficiency; Stability
Funding
- Ningbo S&T Innovation 2025 Major Special Program [2018B10055]
- Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou, China
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The research reveals the importance of appropriate phase separation/blend morphology in device performance, which can be achieved through the use of a ternary strategy or suitable solvent.
Blend morphology is crucial for the efficiency and stability of organic solar cells. Exploring and understanding the correlations between is meaningful and greatly desired. In this work, based on polymer donor (PTB7-Th), fullerene and non-fullerene acceptors (PC71BM and Y6), we systematically study the influence of ternary strategy and solvent system on device performance and stability. It is found that insufficient and excessive phase separation of blend could result in the depressed performance of corresponding devices. Appropriate phase separation/blend morphology can be achieved by utilizing a ternary strategy or suitable solvent. Chloroform-processed ternary blend PTB7-Th:Y6:PC71BM delivers efficiency of 9.55%, with dramatically enhanced J(SC) of 24.68 mA cm(-2) due to optimized absorption, blend morphology and optoelectmnic properties. More importantly, superior device stability is demonstrated for the optimal ternary device under both thermal stress and maximum power point operation, by maintaining 80% of initial efficiency at 85 degrees C for 880 h and presenting almost zero efficiency decay in 200 h under MPP operation.
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