三元运算
材料科学
轨道能级差
接受者
有机太阳能电池
吸收(声学)
开路电压
聚合物太阳能电池
吸收光谱法
光电子学
太阳能电池
电压
化学
有机化学
分子
物理
光学
计算机科学
聚合物
凝聚态物理
复合材料
量子力学
程序设计语言
作者
Xiang Xu,Chaoyuan Sun,Jianhua Jing,Tianqi Niu,Xiao Wu,Kai Zhang,Fei Huang,Qing‐Hua Xu,Jun Yuan,Xinhui Lu,Yonghua Zhou,Yingping Zou
标识
DOI:10.1021/acsami.2c07883
摘要
A ternary strategy is viable to minimize the trade-off between short-circuit current density (Jsc) and open-circuit voltage (Voc) in organic solar cells. Generally, the ternary OSCs can achieve a higher PCE than the binary counterparts by subtly utilizing the particular photoelectric properties of the third material. In this regard, we choose BTP-CC with a higher-lying LUMO level based on a fused TPBT (dithienothiophen[3.2-b]-pyrrolobenzothiadiazole) central framework and CC (2-(6-oxo-5,6-dihydro-4H-cyclopenta [b]thiophen-4-ylidene) malononitrile) flanking groups as the third component to broaden the light-absorption spectrum, regulate the bulk heterojunction (BHJ) morphology, improve the Voc, and reduce the charge recombination in OSCs. In addition, BTP-CC demonstrates intense intermolecular energy transfer to Y6 by fluorescence resonance energy transfer (FRET) pathway, which is due to the photoluminescence (PL) spectrum of BTP-CC covering the absorption region of Y6. The PM6:Y6:BTP-CC based ternary OSC achieves a champion PCE of 17.55%. Further investigation indicates that introduction of BTP-CC could reduce the trap states in OSCs, leading to an increased charge carrier density. Moreover, the incorporation of BTP-CC could improve the device stability. These results demonstrated that BTP-CC is important in improving the photovoltaic performance of ternary OSCs, and this work also provides a guideline for constructing ideal ternary OSCs in the future.
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