Molecular Orientation and Ultrafast Charge Transfer Dynamics Studies on the P3HT:PCBM Blend
Molecular Orientation and Ultrafast Charge Transfer Dynamics Studies on the P3HT:PCBM Blend
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DOI：
10.1021/acs.jpcc.6b08056
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发表时间：
2016-11-03
影响因子：
3.7
通讯作者：
Rocco, M. L. M.
中科院分区：
文献类型：
--
作者：
Borges, B. G. A. L.;Veiga, A. G.;Rocco, M. L. M.
用X射线吸收谱（XAS）和共振俄歇谱（RAS）研究了聚3-己基噻吩（P3 HT）与6，6-苯基-C61-丁酸甲酯（PCBM）共混物在硫K吸收边的核-孔方法. P3 HT：PCBM共混物是广泛用作有机光致发光（OPV）中的本体异质结（BHJ）光活性层的众所周知的系统。其形态、相分离和组成相的有序性已被证明显著影响所得OPV器件的性能。在本文中，就所得完全印刷的OPV模块的功率转换效率（PCE）（对于8 cm（2）有源面积模块为2.22%）而言，在最佳条件下热退火的P3 HT：PCBM膜已被证明是良好有序的膜，如在入射光子的不同角度下测量的XAS光谱所揭示的。此外，电子离域时间计算作为激发能量的函数，导致在飞秒制度中的一个非常低的离域时间。
Ultrathin films of poly(3-hexylthiophene) (P3HT) blended with 6,6-phenyl-C61-butyric acid methyl ester (PCBM) were investigated by X-ray absorption spectroscopy (XAS) and resonant Auger spectroscopy (RAS) in the context of the core-hole approach at the sulfur K absorption edge. P3HT:PCBM blend is a well-known system widely used as a bulk heterojunction (BHJ) photoactive layer in organic photovoltaics (OPV). Its morphology, phase separation and ordering of the constituent phases have been proven to significantly affect the performance of the resulting OPV devices. Herein, thermally annealed P3HT:PCBM films at optimum conditions, in terms of power conversion efficiency (PCE) of the resulting fully printed OPV modules (2.22% for 8 cm(2) active area modules), have been proven to be well-ordered films as revealed by the XAS, spectra measured at different angles of the incoming photons. Moreover, electron delocalization times were calculated as a function of the excitation energy, resulting in a very low delocalization time in the femtosecond regime.