A novel D– π –A small molecule with N -heteroacene as acceptor moiety for photovoltaic application
作者:Chengyuan Wang、Takuya Okabe、Guankui Long、Daiki Kuzuhara、Yang Zhao、Naoki Aratani、Hiroko Yamada、Qichun Zhang
DOI:10.1016/j.dyepig.2015.06.029
日期:2015.11
Organic π-conjugated small molecules have attracted much attention for developing high performance organic photovoltaics (OPVs) due to their well-defined molecular structure, easily controlled energy levels and absorption, and more accurate simulation-experiment match. A novel small molecule combing a N-heteroacene (acceptor moiety) and benzo[1,2-b:4,5-b′]dithiophene (donor unit) together through a π-conjugated
有机π共轭小分子因其分子结构清晰,能级易于控制和吸收以及更精确的模拟与实验匹配,已引起了人们对开发高性能有机光伏(OPV)的广泛关注。一种新颖的小分子,它通过π将N-杂并苯(受体部分)和苯并[1,2- b:4,5- b ']二噻吩(供体单元)结合在一起已经合成并表征了-共轭桥(3,3“-二辛基-2,2':5',2”-三噻吩)。具有不同受体的这种小分子的共混膜在可见光区域具有宽吸收性,这使得其可用于OPV。以PEDOT:PSS作为阳极缓冲层的预制器件显示出约1%的功率转换效率。通过用MoO 3代替PEDOT:PSS ,功率转换效率几乎翻了一番,达到1.97%。AFM图像和XRD图案用于研究活性层的形貌。与J – V一致 曲线和EQE光谱,较高的功率转换效率可能来自小分子的HOMO能级与阳极缓冲层的功函数的良好对齐以及活性层与阳极缓冲层之间的化学相互作用降低。