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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >π-Conjugated gradient copolymers suppress phase separation and improve stability in bulk heterojunction solar cells
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π-Conjugated gradient copolymers suppress phase separation and improve stability in bulk heterojunction solar cells

机译：π共轭梯度共聚物可抑制相分离并提高整体异质结太阳能电池的稳定性

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摘要

Gradient sequence copolymers of 3-hexylthiophene (90 mol%) and 3-(6-bromohexyl)thiophene (10 mol%) were synthesized by catalyst transfer polycondensation. Post-polymerization conversion of the side-chain bromides into azides and subsequent Cu-catalyzed azide-alkyne cycloaddition installed C_(60)-functional groups. Comparing blends of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) with and without the gradient copolymer additive revealed that, when the gradient copolymer was present, micron-scale phase separation was not observed even after prolonged thermal annealing times. In addition, the PCBM was still able to quench the P3HT emission after thermal annealing, indicating that the donor-acceptor interfacial area is maintained. Together, these data suggest that the gradient copolymers are an effective compatibilizer for P3HT/PCBM physical blends. This stabilized film morphology led to stable power conversion efficiencies (PCE) of the corresponding bulk heterojunction solar cells even upon extended thermal annealing. Nevertheless, the short circuit current and fill factor were reduced when the gradient copolymer was present, leading to a lower PCE. Overall, these gradient copolymer additives represent a promising tool for inhibiting micron-scale phase separation and producing robust polymer/fullerene-based solar cells.
机译：通过催化剂转移缩聚反应合成3-己基噻吩（90mol％）和3-（6-溴己基）噻吩（10mol％）的梯度序列共聚物。侧链溴化物的聚合后转化为叠氮化物，以及随后的Cu催化的叠氮化物-炔烃环加成反应安装了C_（60）官能团。比较聚（3-己基噻吩）（P3HT）和苯基-C61-丁酸甲酯（PCBM）在有和没有梯度共聚物添加剂的情况下的混合物，发现存在梯度共聚物时，甚至没有观察到微米级的相分离经过延长的热退火时间。此外，PCBM在热退火后仍能够淬灭P3HT的发射，表明可以维持供体-受体界面面积。总之，这些数据表明，梯度共聚物是P3HT / PCBM物理共混物的有效增容剂。即使在延长的热退火时，这种稳定的膜形态也导致相应的体异质结太阳能电池的稳定的功率转换效率（PCE）。然而，当存在梯度共聚物时，短路电流和填充因子减小，导致较低的PCE。总体而言，这些梯度共聚物添加剂是抑制微米级相分离并生产坚固的基于聚合物/富勒烯的太阳能电池的有前途的工具。

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