Long-term efficient organic photovoltaics based on quaternary bulk heterojunctions
- Long-term efficient organic photovoltaics based on quaternary bulk heterojunctions
- 한일기; 권석준; 허가현; 남민우; 차민정; 이현희; 이규태; 유재홍; 고두현
- organic photovoltaics; long-term; stability; bulk heterojunctions; quaternary; thin film; inverse cascade; absorption efficiency
- Issue Date
- Nature Communications
- VOL 8-14068-10
- A major impediment to the commercialization of organic photovoltaics (OPVs) is attaining long-term morphological stability of the bulk heterojunction (BHJ) layer. To secure the stability while pursuing optimized performance, multi-component BHJ-based OPVs have been strategically explored. Here we demonstrate the use of quaternary BHJs (q-BHJs) composed of two conjugated polymer donors and two fullerene acceptors as a novel platform to produce high-efficiency and long-term durable OPVs. A q-BHJ OPV (q-OPV) with an experimentally optimized composition exhibits an enhanced efficiency and extended operational lifetime than does the binary reference OPV. The q-OPV would retain more than 72% of its initial efficiency (for example, 8.42-6.06%) after a 1-year operation at an elevated temperature of 65 degrees C. This is superior to those of the state-of-the-art BHJ-based OPVs. We attribute the enhanced stability to the significant suppression of domain growth and phase separation between the components via kinetic trapping effect.
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