A non-fullerene acceptor with all “A” units realizing high open-circuit voltage solution-processed organic photovoltaics
作者:Lingcheng Chen、Linquan Huang、Dong Yang、Shuying Ma、Xin Zhou、Jian Zhang、Guoli Tu、Can Li
DOI:10.1039/c3ta14396a
日期:——
A novel non-fullerene small molecule electron acceptor TTzBT-DCAO, which contains all electron-withdrawing units of 2,1,3-benzothiadiazole, oligothiazole and alkyl cyanoacetate, has been synthesized and characterized. Its photophysical, electrochemical, and photovoltaic properties have been investigated. The material has favorable HOMO and LUMO levels of â5.88 and â3.60 eV, and shows strong absorption in the visible spectrum up to 650 nm. The small moleculeâ:ânon-fullerene bulk-heterojunction organic photovoltaics (OPVs) were constructed based on two small molecules SF8TBT and TTzBT-DCAO. The influence of the donorâ:âacceptor composition on device performance was investigated. The open-circuit voltages of the devices are over 1.20 V, which is among the highest values reported for single-junction OPVs. The results indicate that small molecules with all electron-withdrawing units could provide a novel route to efficient solution-processed OPVs with high open-circuit voltages.
一种新型非富勒烯小分子电子受体TTzBT-DCAO,含有2,1,3-苯并噻二唑、噻唑低聚物和烷基氰基乙酸酯等所有吸电子单元,已被合成并表征。研究了其光物理、电化学和光伏性能。该材料具有良好的HOMO和LUMO能级,分别为-5.88和-3.60 eV,并在可见光谱中表现出高达650 nm的强烈吸收。基于两种小分子SF8TBT和TTzBT-DCAO构建了小分子:非富勒烯体异质结有机光伏器件(OPV)。研究了供体:受体组成对器件性能的影响。器件的开路电压超过1.20 V,这是单结OPV报道的最高值之一。结果表明,具有所有吸电子单元的小分子可以为高效溶液法制备OPV提供一条新途径,具有高开路电压。