Femtosecond Time-Resolved Fluorescence Study of P3HT/PCBM Blend Films
Femtosecond Time-Resolved Fluorescence Study of P3HT/PCBM Blend Films
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DOI：
10.1021/jp912288p
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发表时间：
2010-08
影响因子：
3.7
通讯作者：
Yu Xie;Yong Li;Lixin Xiao;Q. Qiao;R. Dhakal;Zhiling Zhang;Q. Gong;D. Galipeau;Xingzhong Yan
中科院分区：
文献类型：
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作者：
Yu Xie;Yong Li;Lixin Xiao;Q. Qiao;R. Dhakal;Zhiling Zhang;Q. Gong;D. Galipeau;Xingzhong Yan
为了了解光诱导初始过程对热退火的依赖性，采用荧光上转换技术研究了热退火的聚3-己基噻吩（P3 HT）/[6，6]-苯基-C61丁酸甲酯（PCBM）共混膜中P3 HT的飞秒时间分辨荧光动力学.为了进行比较，还研究了P3 HT溶液、原始P3 HT和未退火的P3 HT/PCBM共混物膜。P3 HT溶液的荧光动力学表现出波长依赖性。链段间的激发能转移和扭转弛豫可能发生在几ps的时间尺度内。在较长波长发射下观察到的上升时间表明形成了这些相对较低的发射状态（在650和700 nm处）。电荷转移（或激子淬灭）是占主导地位的过程中，在FS的时间尺度与发射在650 nm的未退火的共混物膜。在退火的共混膜中，电荷转移（334 fs）和电荷转移（334 fs）的速率都随退火温度的升高而增加。
In order to understand the dependence of photoinduced initial processes on thermal annealing, the femtosecond time-resolved fluorescence dynamics of regioregular poly(3-hexylthiophene) (P3HT) in (thermally) annealed P3HT/[6,6]-phenyl-C61 butyric acid methyl ester (PCBM) blend films has been studied by using the fluorescence up-conversion technique. For comparison, a P3HT solution, pristine P3HT, and unannealed P3HT/PCBM blend films have been investigated as well. The fluorescence dynamics of the P3HT solution showed wavelength dependence. Excitation energy transfer between the segments and torsional relaxation possibly occurred in a time scale of several ps in the solution. Observed rise times at longer wavelength emission suggested the formation of these relatively lower emission states (at 650 and 700 nm). Charge transfer (or excitonic quenching) was the dominant process in the fs time scale with emission at 650 nm in the unannealed blend film. In the annealed blend film, the charge transfer (334 fs) an...