External quantum efficiency versus charge carriers mobility in polythiophene/methanofullerene based planar photodetectors
External quantum efficiency versus charge carriers mobility in polythiophene/methanofullerene based planar photodetectors
复制标题
基于聚噻吩/亚甲基富勒烯的平面光电探测器中的外部量子效率与载流子迁移率
DOI：
10.1063/1.2756079
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发表时间：
2007
影响因子：
3.2
通讯作者：
S. Luzzati
中科院分区：
文献类型：
--
作者：
M. Caironi;T. Agostinelli;D. Natali;M. Sampietro;R. Cugola;M. Catellani;S. Luzzati
基于重量为1:1的聚3-己基噻吩（P3HT）和c61 -丁酸甲酯（PCBM）共混物，研究了电子和空穴迁移率对光电探测器外量子效率（EQE）的影响。为了将光电探测器上测量的光电特性（效率和瞬态光电流）与场效应晶体管上测量的输运特性相当地联系起来，光电探测器和晶体管已经生产出相同的平面几何形状，在这两种情况下，电荷流相对于衬底在相同的方向上发生。在基于原始P3HT、原始PCBM和P3HT:PCBM 1:1混合的器件上进行了退火前后的测量，并揭示了平衡载流子输运的重要性，表明只要电子（最慢的载流子）的迁移率增加，量子效率就会提高。另一方面，响应时间主要受扩展的影响。
The paper studies the role of electrons and holes mobility in determining the external quantum efficiency (EQE) in photodetectors based on a 1:1 in weight blend of poly(3-hexylthiophene) (P3HT) and C61-butyric acid methyl ester (PCBM). In order to fairly correlate the optoelectronic properties (efficiency and transient photocurrent) measured on photodetectors with the transport properties measured on field effect transistors, the photodetectors and the transistors have been produced with an identical planar geometry, where in both cases the charges flow occurs in the same direction with respect to the substrate. The measurements have been performed on devices based on pristine P3HT, on pristine PCBM, and on P3HT:PCBM 1:1 blend, before and after annealing, and have revealed the importance of a balanced carrier transport, showing that quantum efficiency increases as long as the mobility of electrons, which are the slowest carrier, increases. On the other end, the response time is mainly affected by the exte...