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Gradient heating dissolution of active materials enhances the performance of organic solar cells
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DOI：10.1016/j.orgel.2026.107416.png)
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Abstract
En 中文
The optimization of active layer morphology is essential for achieving high performance of organic solar cells (OSCs). Nonetheless, conventional methods often overlook the dynamic regulation during the dissolution of polymer electron donor materials, which significantly influences the nanostructures of the active layers. In this study, we introduce a gradient heating dissolution method to regulate the dissolution behavior of D18:L8-BO active layer by employing a programmed temperature ramp, which enables staged dissolution regulation of the active materials. As results, the active layers obtained from the solution by gradient heating method exhibits optimized phase separation, more compacted molecular stacking and reduced defect states. Consequently, the devices based on the gradient heating method obtain an optimized power conversion efficiency (PCE) of 18.82%, outperforming the 17.65% PCE obtained from conventional direct heating method. Improvements of shortcircuit current density (JSC) and fill factor (FF) are also noted, which are attributed to the more balanced charge transport, higher charge collection efficiency, and suppressed charge recombination. Furthermore, the devices based on gradient heating method demonstrate superior stability, maintaining over 90% original PCE after 1500 h at ambient temperature and retaining 90% efficiencies after 200 h of thermal aging at 80 degrees C. This work underscores the significance of the dissolution of polymer active materials for the morphology control of polymer-based films and provides a facile and universal strategy for enhancing the performance of OSCs.
Keywords:
Organic solar cells
Gradient heating
Polymer dissolution
Film morphology
Device performance
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2.6
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244
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1.1W
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