Abstract
Herein, we demonstrate that the lifetimes of polymer-based solar cells comprising PTB7-F20:PC71BM composites can be significantly increased by using post-additive-soaked bulk heterojunction (BHJ) films. Analyses of solar cell performance, film morphology, time-resolved photoluminescence, and photoconductivity revealed that the above increase resulted from the combined effects of the improved carrier generation and transport in post-additive-soaked BHJ films and the efficient deactivation of burn-in loss by using the photochemically stable PTB7-F20 polymer.
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