New Insights into the Molecular Dynamics of P3HT:PCBM Bulk Heterojunction: A Time-of-Flight Quasi-Elastic Neutron Scattering Study
New Insights into the Molecular Dynamics of P3HT:PCBM Bulk Heterojunction: A Time-of-Flight Quasi-Elastic Neutron Scattering Study
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DOI：
10.1021/acs.jpclett.6b00537
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发表时间：
2016-06-16
影响因子：
5.7
通讯作者：
Nelson, Jenny
中科院分区：
文献类型：
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作者：
Guilbert, Anne A. Y.;Zbiri, Mohamed;Nelson, Jenny
有机半导体共混层的分子动力学很可能会影响太阳能电池等器件的光电性能和性能。我们用飞行时间准弹性中子散射研究了聚(3-己基噻吩基)(P3HT)：苯基-C61-丁酸甲酯(PCBM)共混物在250-360K温度范围内的动力学(5-50ps)，从而跨越了聚合物的玻璃化转变温度区域和OPV器件的工作温度。QENS信号的行为为P3HT在共混时的玻璃化，特别是在玻璃化转变温度以上，以及P3HT对PCBM的塑化提供了证据，这两种动力学都发生在皮秒时间尺度上。
The molecular dynamics of organic semiconductor blend layers are likely to affect the optoelectronic properties and the performance of devices such as solar cells. We study the dynamics (5-50 ps) of the poly(3-hexylthiophene) (P3HT): phenyl-C61-butyric acid methyl ester (PCBM) blend by time-of-flight quasi-elastic neutron scattering, at temperatures in the range 250-360 K, thus spanning the glass transition temperature region of the polymer and the operation temperature of an OPV device. The behavior of the QENS signal provides evidence for the vitrification of P3HT upon blending, especially above the glass transition temperature, and the plasticization of PCBM by P3HT, both dynamics occurring on the picosecond time scale.