Excited-states spectroscopies and its magnetic field effect of π-conjugated polymer-fullerene blends with below-gap excitation

被引：2

作者：

Wang, R. Z. ^{[1
]}

Yang, X. ^{[1
]}

Hong, W. ^{[1
]}

Wang, Y. C. ^{[1
]}

Li, H. ^{[1
]}

Li, L. ^{[1
]}

Sheng, C. -X. ^{[1
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Jiangsu, Peoples R China

来源：

SYNTHETIC METALS | 2017年 / 223卷

基金：

中国国家自然科学基金;

关键词：

Organic materials; Photovoltaic applications; Solar energy; ORGANIC SOLAR-CELLS; CHARGE-TRANSFER; PHOTOVOLTAIC APPLICATIONS; PHOTOEXCITATION DYNAMICS; FILMS; GENERATION; HETEROJUNCTION; RECOMBINATION; COMPOSITES; RELAXATION;

D O I：

10.1016/j.synthmet.2016.12.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We used continuous wave photoinduced absorption (PIA) spectroscopy to investigate long-lived polarons in blend of [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) and regio-regular poly (3-hexylthiophene) (RR-P3HT) with below-gap excitation. Compared to above-gap excitation, the polarons exhibited thermally activated and multi-trap limited bimolecular recombination too, but with narrower distribution profile in polaron states in millisecond time regime. However, magnetophoto-induced absorption (MPA) of polarons presented much weaker magnetic field effect in below-gap excitation (similar to 0.5 mT) than in above-gap excitation (order of similar to 10 mT), although the underline mechanism is same as spin mixing of polaron pairs by the hyperfine interaction at small field region. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：132 / 136

页数：5

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