Two new π-conjugated polymers with donor backbone and π-conjugated indolin-2-one side chains, PBDTTI and PBDTTIF, are designed and synthesized as wide bandgap donors for non-fullerene acceptor-based organic solar cells (OSCs). The monomers containing electron accepting indolin-2-one side chains, (Z)-3-((2,5-dibromothiophen-3-yl) methylene)-1-methylindolin-2-one (M1) and (Z)-3-((2,5-dibromothiophen-3-yl) methylene)-5-fluoro-1-methylindolin-2-one (M2), can be easily synthesized via Knoevenagel condensation between 2,5-dibromothiophene-3-carbaldehyde and 2-oxindole or 5-fluoro-2-oxindole, respectively. Stille coupling polymerization of the electron donating benzodithiophene (BDT)-containing monomer 1,1′-[4,8-bis [5-(2-ethylhexyl)-2-thienyl]benzo [1,2-b:4,5-b′]dithiophene-2,6-diyl]bis [1,1,1-trimethylstannane] and M1 or M2 produced PBDTTI or PBDTTIF, respectively. The strong electron accepting π-conjugated 1-methylindolin-2-one and 5-fluoro-1-methylindolin-2-one side chains can achieve low-lying HOMO energy levels of −5.59 eV for PBDTTI and −5.60 eV for PBDTTIF, which is beneficial for realizing high open circuit voltage (V_OC) of the resulting OSCs. On the other hand, since the electron acceptor units are on the side chains, the polymer backbone containing only electron donor units could maintain wide bandgaps of 1.91 eV and 1.89 eV for PBDTTI and PBDTTIF, respectively. When PBDTTI and PBDTTIF were used as donors and a small bandgap non-full acceptor ITIC as an acceptor, the resulting OSCs devices achieved V_OC of 0.97 and 1.00 V, short circuit current densities (J_SC) of 15.60 and 13.70 mAcm^-2, and fill factors (FF) of 0.60 and 0.59, resulting in power conversion efficiencies of 8.00 and 7.70%, respectively.

设计并合成了两种具有供体骨架和 π-共轭 indolin-2-one 侧链的新型 π-共轭聚合物，PBDTTI 和 PBDTTIF，作为非富勒烯受体基有机太阳能电池 (OSC) 的宽带隙供体。含电子接受indolin-2-one侧链的单体，(Z)-3-((2,5-dibromothiophen-3-yl)methylene)-1-methylindolin-2-one (M1)和(Z)-3 -((2,5-dibromothiophen-3-yl)methylene)-5-fluoro-1-methylindolin-2-one (M2)，可以很容易地通过 2,5-dibromothiophene-3-carbaldehyde 和 2 -oxindole 或 5-fluoro-2-oxindole。含电子苯并二噻吩 (BDT) 单体 1,1'-[4,8-双 [5-(2-乙基己基)-2-噻吩基]苯并 [1,2- b :4,5- ] 的 Stille 偶联聚合乙']二噻吩-2,6-二基]双[1,1,1-三甲基锡烷]和M1或M2分别产生PBDTTI或PBDTTIF。强电子接受 π-共轭 1-methylindolin-2-one 和 5-fluoro-1-methylindolin-2-one 侧链可以实现 PBDTTI 的 -5.59 eV 和 PBDTTIF 的 -5.60 eV 的低位 HOMO 能级，这有利于实现所得 OSC 的高开路电压 (V _OC )。另一方面，由于电子受体单元位于侧链上，仅包含电子供体单元的聚合物主链可以分别为 PBDTTI 和 PBDTTIF 保持 1.91 eV 和 1.89 eV 的宽带隙。当PBDTTI和PBDTTIF作为供体，小带隙非全受体ITIC作为受体时，由此产生的OSCs器件实现了V _OC0.97 和 1.00 V，短路电流密度 (J _SC ) 为 15.60 和 13.70 mAcm ^-2，填充因子 (FF) 为 0.60 和 0.59，导致功率转换效率分别为 8.00 和 7.70%。