Efficient modulation of end groups for the asymmetric small molecule acceptors enabling organic solar cells with over 15% efficiency
作者:Gang Li、Dandan Li、Ruijie Ma、Tao Liu、Zhenghui Luo、Guanwei Cui、Lili Tong、Ming Zhang、Zaiyu Wang、Feng Liu、Liang Xu、He Yan、Bo Tang
DOI:10.1039/d0ta01032d
日期:——
Non-fullerene organic solar cells (OSCs) have attracted tremendous interest and made an impressive breakthrough, largely due to advances in high-performance small molecule acceptors (SMAs). The relationship between short-circuit current density (JSC) and open-circuit voltage (VOC) is usually shown as one falls, the other rises. Controlling the trade-off between JSC and VOC to harvest high power conversion
非富勒烯有机太阳能电池(OSC)引起了极大的兴趣,并取得了令人印象深刻的突破,这在很大程度上归功于高性能小分子受体(SMA)的进步。短路电流密度(J SC)和开路电压(V OC)之间的关系通常表示为一个下降,另一个上升。控制J SC和V OC之间的权衡以获取高功率转换效率(PCE)仍然是一个挑战。在此,双硫醇[3,2- b:2′,3′- d设计并合成了基于吡咯(DTP)的不对称SMA,具有不同的基于氯化二氰基茚满酮的端基,分别命名为TPIC,TPIC-2Cl和TPIC-4Cl。这些不对称受体表现出显着的红移吸收曲线,而当氯原子数从0、1变为2时,由于逐渐提高的电负性,其能级同时下移。结果,基于PM7:TPIC-4Cl的OSC达到了15.31%的最佳PCE,这是基于不对称SMA的非富勒烯二元OSC的最高PCE。PM7:TPIC-4Cl系统的优越性包括平衡的电荷传输,有利的相分离,有效的激子离