Improving open-circuit voltage by a chlorinated polymer donor endows binary organic solar cells efficiencies over 17%
Improving open-circuit voltage by a chlorinated polymer donor endows binary organic solar cells efficiencies over 17%
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DOI：
10.1007/s11426-019-9669-3
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发表时间：
2020-02-17
影响因子：
9.6
通讯作者：
Yan, He
中科院分区：
文献类型：
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作者：
Ma, Ruijie;Liu, Tao;Yan, He
近年来，单结聚合物太阳能电池的功率转换效率（PCE）有了显著的突破。据报道，大量的工作，以实现从PM 6：Y 6二元系统获得的PCE高于16%。为了进一步增加掺入小分子受体（SMA）Y 6的二元OSC的PCE，由于PM 7的更深的最高占据分子轨道（HOMO），我们用PM 7取代PM 6。因此，由于改善了开路电压（VOC），PM 7：Y 6通过热铸法实现了高达17.0%的PCE。与PM 6相比，PM 7的较低HOMO增大了ELUMO-供体和EHOMO-受体之间的差距，这与V-OC成正比。该研究为单结二元PSC提供了高PCE，这对于与PM 7相关的器件制造和PSC的商业化具有重要意义。
Power conversion efficiency (PCE) of single-junction polymer solar cells (PSCs) has made a remarkable breakthrough recently. Plenty of work was reported to achieve PCEs higher than 16% derived from the PM6:Y6 binary system. To further increase the PCEs of binary OSCs incorporating small molecular acceptor (SMA) Y6, we substituted PM6 with PM7 due to the deeper highest occupied molecular orbital (HOMO) of PM7. Consequently, the PM7:Y6 has achieved PCEs as high as 17.0% by the hotcast method, due to the improved open-circuit voltage (VOC). Compared with PM6, the lower HOMO of PM7 increases the gap between ELUMO-donor and EHOMO-acceptor, which is proportional to V-OC. This research provides a high PCE for single-junction binary PSCs, which is meaningful for device fabrication related to PM7 and commercialization of PSCs.