In this study, wide bandgap (WBG) two-dimensional (2D) copolymer donors (DZ1, DZ2, and DZ3) based on benzodithiophene (BDT) on alkoxyphenyl conjugated side chains without and with different amounts of chlorine atoms and difluorobenzotriazole (FBTZ) are designed and synthesized successfully for efficient non-fullerene polymer solar cells (PSCs). Three polymer donors DZ1, DZ2, and DZ3 display similar absorption spectra at 300–700 nm range with optional band-gap (E_g^opt) of 1.84, 1.92, and 1.97 eV, respectively. Compared with reported DZ1 without chlorine substitution, it is found that introducing chlorine atoms into the meta-position of the alkoxyphenyl group affords polymer possessing a deeper the highest occupied molecular orbital (HOMO) energy level, which can increase open circuit voltage (V_OC) of PSCs, as well as improve hole mobility. Non-fullerene bulk heterojunction PSCs based on DZ2:MeIC demonstrate a relatively high power conversion efficiency (PCE) of 10.22% with a V_OC of 0.88 V, a short-circuit current density (J_SC) of 17.62 mA/cm², and a fill factor (FF) of 68%, compared with PSCs based on DZ1:MeIC (a PCE of 8.26%) and DZ3:MeIC (a PCE of 6.28%). The results imply that adjusting chlorine atom amount on alkoxyphenyl side chains based on BDT polymer donors is a promising approach of synthesizing electron-rich building block for high performance of PSCs.

在这项研究中，宽带隙（WBG）的二维（2D）共聚物供体（DZ1，DZ2，和DZ3）基于苯并二噻吩（BDT）上烷氧基偶联侧链不具有和具有不同量的氯原子和difluorobenzotriazole的（FBTZ）是设计并成功合成了高效的非富勒烯聚合物太阳能电池（PSC）。三种聚合物供体DZ1，DZ2和DZ3在300-700 nm范围内具有可选的带隙（显示类似的吸收光谱Ë_克^选择的1.84，1.92），和1.97电子伏特，分别。与报告的DZ1相比在没有氯取代的情况下，发现将氯原子引入烷氧基苯基的间位可使聚合物拥有更深的最高占据分子轨道（HOMO）能级，从而可以增加PSC的开路电压（V _OC），因为以及提高空穴迁移率。基于非富勒烯本体异质结的PSC DZ2：MEIC证明的10.22％的相对高的功率转换效率（PCE）与V _OC为0.88V，短路电流密度（Ĵ _SC 17.62毫安/厘米的）²，和的填充系数为68％（FF），基于比较的PSC DZ1：MEIC（8.26％的PCE）和DZ3：MeIC（PCE为6.28％）。结果表明，基于BDT聚合物供体调节烷氧基苯基侧链上的氯原子量是合成用于PSC高性能的富电子构建基的有前途的方法。