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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Thermal Annealing Effects on the Photocarrier Dynamics in PCBM Films
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Thermal Annealing Effects on the Photocarrier Dynamics in PCBM Films

机译：PCBM电影中光载波动力学的热退火效应

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摘要

The thermal annealing effects on the photocarrier dynamics in thin films of [6,6]-phenyl C-61 butyric acid methyl ester (PCBM) on quartz substrates are investigated. Both the photocarrier generation via charge-transfer state and the charge transport in PCBM films are studied by time-resolved photoconductance (PC) measurement. More than 90% of external photocarrier generation efficiency relative to the non-annealed film is reduced upon annealing of the PCBM film at high temperatures. Excitation light power dependence of PC indicates that the photocarrier in the non-annealed film is generated by a one-photon process, while photons of more than one are required in highly annealed films. The multiphotonic process for carrier generation and the substantial reduction of carrier density caused by the thermal treatment are associated with trap formation. The density of photoinjected carrier is also affected by applying external magnetic field. The observed positive magnetophotoconductance (MPC) in non-annealed film is understood in terms of the incoherent spin conversion in nongeminate electron-hole (e-h) pairs with a selective recombination from singlet e-h pairs. In highly annealed film, the broad magnetic field dependence of MPC with negative phase is suggested to originate from the detrapping of trapped carrier assisted by collision with the triplet exciton.
机译：研究了在石英底物上[6,6] - 苯基C-61丁酸甲酯（PCBM）薄膜中对光载体动力学的热退火效应。通过电荷转移状态和PCBM膜中的电荷传输的光载体通过时间分辨的光电导（PC）测量来研究。在高温下的PCBM薄膜退火时，减少了相对于非退火膜的超过90％的外部光载体产生效率。 PC的激发光功率依赖性表示非退火膜中的光载体由单光子过程产生，而在高度退火的膜中需要多于一个的光子。载流子生成的多旋转过程和由热处理引起的载体密度的大幅降低与陷阱形成相关。光反射载体的密度也受到外部磁场的影响。非退火膜中观察到的正磁极电极（MPC）在不透明的电子 - 孔（E-H）对中的不连贯的旋转转化物方面，具有来自单态E-H对的选择性重组。在高退火的膜中，建议使用与阴相的宽磁场依赖性源于与三重态激子碰撞辅助的被捕获的载体的脱落。

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