Photophysics of Charge Generation in Organic Photovoltaic Materials: Kinetic Studies of Geminate and Free Polarons in a Model Donor/Acceptor System
Photophysics of Charge Generation in Organic Photovoltaic Materials: Kinetic Studies of Geminate and Free Polarons in a Model Donor/Acceptor System
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有机光伏材料中电荷产生的光物理学：模型供体/受体系统中双子和自由极化子的动力学研究
DOI：
10.1021/jp206840m
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Snedden E
中科院分区：
文献类型：
--
作者：
Snedden E
研究了在模型施主/受主共混体系中光诱导电荷的产生，该体系由共轭聚合物区域规则聚（3-己基噻吩）（P3 HT）和染料分子酞菁（PC）的本体异质结共混物组成。在780 nm处激发进入PC NIR吸收带，在PC域中产生激子，而不填充P3 HT激发态。然后，可以在没有来自直接产生的极化子、能量转移或显著的激子迁移的特征的干扰的情况下跟踪成对极化子对（GPP）和自由极化子的动力学。供体/受体膜形态对形成的自由极化子和GPP的比率具有显著影响：增加的相分离导致直接形成的自由极化子的分数显著增加。与自由极化子群体不同，GPP受到直接到基态的快速复合的影响，发生的时间常数为170 ps。GPP和自由极化子都在P3 HT/PC界面形成。然而，自由极化子能够从这些界面迁移到大块的准结晶P3 HT区域。最后，我们的模型系统所获得的结果进行了比较，在P3 HT/PCBM 1：1共混膜的光生电荷产生。获得了电子转移后自由极化子形成产率为100%的指示;没有观察到GPP形成。这与基于这些共混物的光物理学和OPV器件表征的先前研究一致。
Photoinduced charge generation is studied in a model donor/acceptor blended system, consisting of bulk-heterojunction blends of the conjugated polymer regioregular poly(3-hexylthiophene) (P3HT) and the dye molecule phthalocyanine (PC). Excitation at 780 nm, into the PC NIR absorption band, creates excitons in PC domains without populating the P3HT excited state. The kinetics of geminate polaron pairs (GPP) and free polarons can then be followed without the interference from the signatures of directly created polarons, energy transfer, or significant exciton migration. The donor/acceptor film morphology has a significant impact on the ratio of free polarons and GPP that are formed: increased phase segregation leads to a pronounced increase on the fraction of free polarons formed directly. Unlike the free polaron population, GPPs are affected by fast recombination directly to the ground state, occurring with a time constant of 170 ps. Both GPP and free polarons are formed at the P3HT/PC interfaces. Free polarons are, however, able to migrate from these interfaces into the bulk, quasi-crystalline P3HT regions. Finally, the results obtained with our model system were compared with the photoinduced charge generation in P3HT/PCBM 1:1 blend films. Indication for free polaron formation yield following electron transfer of ∼100% was obtained; no GPP formation was observed. This is in agreement with previous studies of both the photophysics and OPV device characterization based on these blends.
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影响因子：
19
作者：
Koppe, Markus;Egelhaaf, Hans-Joachim;Hoth, Claudia N.
通讯作者：
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影响因子：
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作者：
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J. Nelson
影响因子：
56.9
作者：
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DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
I. Yilmaz;A. Gürek;V. Ahsen
通讯作者：
V. Ahsen
影响因子：
4
作者：
Hallermann, Markus;Da Como, Enrico;von Hauff, Elizabeth
通讯作者：
von Hauff, Elizabeth