三元运算
结晶度
材料科学
活动层
短路
光活性层
有机太阳能电池
开路电压
吸收(声学)
化学物理
光电子学
吸收光谱法
离解(化学)
聚合物太阳能电池
接受者
共轭体系
带隙
聚合物
化学
光伏系统
激子
分子
能量转换效率
轨道能级差
分子物理学
有机半导体
纳米技术
物理化学
电压
光学
有机化学
图层(电子)
物理
凝聚态物理
复合材料
程序设计语言
计算机科学
薄膜晶体管
量子力学
标识
DOI:10.1016/j.orgel.2021.106153
摘要
Ternary organic photovoltaics (OPVs) were fabricated with two polymers (PM6 and D18) as the donor and the fullerene-free small molecule Y6 as the acceptor in an inverted structure. The blueshifted absorption spectrum of neat D18 relative to neat PM6 can enable harvesting of more short and medium wavelength photons in the ternary photoactive layer, which is beneficial to increasing the short-circuit current density (JSC). The enhancement of the open-circuit voltage (VOC) of the ternary OPVs can be explained by the deeper HOMO level of D18 than that of PM6, which is beneficial to broadening the energy bandgap. In addition, the combination of the cascade LUMO levels among D18, PM6 and Y6 and the enhanced crystallinity can lead to more efficient exciton dissociation and charge transport within the ternary films. As a result, the power conversion efficiency of the optimize ternary OPV is 15.85%, which is higher than those of the PM6:Y6- and D18:Y6-base binary OPVs (PCEs of 14.70% and 14.95%, respectively). The results indicate that ternary OPVs with a blend of two similar chemical structure polymers as the donor could achieve high performance by broadening the light spectrum and optimizing the phase separation and crystallinity.
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