The conventional polymerization of 2,5-bis(trimethylstannyl)thiophene (T) or 2,5-bis(trimethylstannyl)thieno[3,2-b]thiophene (Tt) with 4,6-bis(5-bromothiophen-2-yl)-5-octyl-2-(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,3(2H,5H)-dione (TPPDT) afforded new alternating polymers, namely P(T-TPPDT) or P(Tt-TPPDT), respectively. Both P(T-TPPDT) and P(Tt-TPPDT) exhibited similar thermal stabilities (5% weight loss at around 420 °C) and absorption maxima (λ_max ≈ 515 nm) as films. The absorption bands of P(T-TPPDT) and P(Tt-TPPDT) extend between 300 and 620 nm, with optical band gaps (E_gs) of 2.02 eV and 2.00 eV, respectively. The highest-occupied/lowest-unoccupied molecular-orbital energies of P(Tt-TPPDT) (HOMO/LUMO: −5.35 eV/–3.33 eV) were found to be somewhat higher than those of P(T-TPPDT) (HOMO/LUMO: −5.31 eV/–3.31 eV). Organic solar cells (OSCs) prepared using 1:1.5 (w/w) P(T-TPPDT):PC₇₀BM or P(Tt-TPPDT):PC₇₀BM (PC₇₀BM = [6,6]-phenyl C₇₀ butyric acid methyl ester) blends provided power-conversion efficiencies (PCEs) of 3.50% or 4.71%, respectively. On the other hand, OSCs prepared with 1:1 (w/w) P(T-TPPDT):ITIC or P(Tt-TPPDT):ITIC (ITIC = 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)indanone))-5,5,11,11-tetrakis(4-hexylphenyl)dithieno[2,3-d:2′,3′-d’]-s-indaceno[1,2-b:5,6-b’]dithiophene) blends exhibited improved PCEs of 5.32% or 6.35%, respectively.

2,5-双（三甲基锡烷基）噻吩（T）或2,5-双（三甲基锡烷基）噻吩并[3,2-b]噻吩（Tt）与4,6-双（5-溴噻吩-2-）的常规聚合yl）-5-辛基-2-（2-辛基十二烷基）吡咯并[3,4-c]吡咯-1,3（2H，5H）-二酮（TPPDT）提供新的交替聚合物，即P（T-TPPDT）或P（Tt-TPPDT）。两个P（T-TPPDT）和P（TT-TPPDT）表现出类似的热稳定性（5％的重量损失在约420℃）和最大吸收（λ_最大 ≈515纳米）作为膜。P（T-TPPDT）和P（Tt-TPPDT）的吸收带在300到620 nm之间延伸，具有光学带隙（E _gs）分别为2.02 eV和2.00 eV。发现P（Tt-TPPDT）的最高占用/最低未占用分子轨道能量（HOMO / LUMO：-5.35 eV / –3.33 eV）略高于P（T-TPPDT）（HOMO / LUMO：−5.31 eV / –3.31 eV）。使用1：1.5（w / w）P（T-TPPDT）：PC ₇₀ BM或P（Tt-TPPDT）：PC ₇₀ BM（PC ₇₀ BM = [6,6]-苯基C _70种丁酸甲酯混合物可分别提供3.50％或4.71％的功率转换效率（PCE）。另一方面，用1：1（w / w）P（T-TPPDT）：ITIC或P（Tt-TPPDT）制备的OSC：ITIC（ITIC = 3,9-双（2-亚甲基-（3-（1,1-二氰基亚甲基）茚满酮））-5,5,11,11-四（4-己基苯基）二硫代[2,3-d ：2'，3'-d']-s-茚二酮[1,2-b：5,6-b']二噻吩）共混物的PCE值分别提高了5.32％或6.35％。