Influence of Alkyl Side-Chain Length on the Performance of Poly(3-alkylthiophene)/Polyfluorene All-Polymer Solar Cells
Influence of Alkyl Side-Chain Length on the Performance of Poly(3-alkylthiophene)/Polyfluorene All-Polymer Solar Cells
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DOI：
10.1021/cm100189t
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发表时间：
2010-05
影响因子：
8.6
通讯作者：
B. Friedel;C. McNeill;N. Greenham
中科院分区：
文献类型：
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作者：
B. Friedel;C. McNeill;N. Greenham
研究了聚（3-烷基噻吩）（P3 AT）的烷基侧链长度对以聚芴共聚物F8 TBT（聚（（9，9-二辛基芴）-2，7-二基-alt-[4，7-双（3-己基噻吩-5-基）-2，1，3-苯并噻二唑]-2Mobi，2 ′′-二基））为电子受体的全聚合物共混光伏器件性能的影响.丁基，己基，辛基和癸基侧链进行了研究，观察到的器件性能的明显趋势。首次报道了未共混的聚噻吩的性质，即它们的热、物理、电化学和形态特征。光伏器件性能的观察到的趋势解释的复杂的相互作用之间的能级偏移，共混物形态和电荷载流子迁移率。器件性能对退火温度特别敏感，退火温度影响P3 AT的再结晶和相分离的粗化。聚3-己基噻吩（P3 HT）是最佳的P3 A聚合物。
We have investigated the influence of the alkyl side-chain length of poly(3-alkylthiophene) (P3AT) on the performance of all-polymer blend photovoltaic devices with the polyfluorene copolymer F8TBT (poly((9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole]-2′,2′′-diyl)) used as the electron acceptor. Butyl, hexyl, octyl, and decyl side-chains have been studied, with clear trends in the device performance observed. The properties of the unblended polythiophene are first reported, namely their thermal, photophysical, electrochemical, and morphological characteristics. The observed trends in photovoltaic device performance are interpreted in terms of the complex interplay between energy level offsets, blend morphology and charge carrier mobility. Device performance is especially sensitive to the annealing temperature employed that influences both the recrystallization of P3AT and the coarsening of phase separation. Poly(3-hexylthiophene) (P3HT) is found to be the optimum P3A...