Effects of Acyloxy Groups in Anthrabisthiadiazole-Based Semiconducting Polymers on Electronic Properties, Thin-Film Structure, and Solar Cell Performance
作者:Hiroki Mori、Yuki Yamada、Yukiya Minagawa、Natsuki Hasegawa、Yasushi Nishihara
DOI:10.1246/bcsj.20220093
日期:2022.6.15
Donor-acceptor (D-A) polymers with the anthra[1,2-c:5,6-c’]bis([1,2,5]thiadiazole) (ATz)-based acceptor unit bearing acyloxy groups in the 6,12-positions were synthesized. By incorporating electron-withdrawing acyloxy groups, the synthesized monomers 5a and 5b showed a down-shifted HOMO while maintaining LUMO energy level compared to the alkoxy-substituted ATz monomer ATz2T-o6OD, which we have previously
以蒽[1,2- c : 5,6- c ']双([1,2,5]噻二唑)(ATz)为基础的受体单元在6,12中带有酰氧基的供体-受体(DA)聚合物-位置被合成。通过引入吸电子酰氧基,与我们之前报道的烷氧基取代的 ATz 单体ATz2T-o6OD相比,合成的单体5a和5b在保持 LUMO 能级的同时显示出下移的 HOMO 。DFT 计算表明,ATz 核心在 6,12 位的 LUMO 是节点平面,LUMO 能级的变化可以忽略不计。相反,尽管存在酰氧基,聚合物PATz4T-a12R ( a12R =发现在本研究中合成的a12OD和a12DT)具有比先前报道的烷氧基取代聚合物PATz4T-o6OD更高的 HOMO 能级。HOMO能级的这种升高可能归因于酰氧基的独特电子效应,其中官能团的电子效应因聚合物中π电子系统的延长而减弱,供电子介观效应可能占主导地位。PATz4T-a12R在共混薄膜中形成了不合适