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Transient Extraction of Holes and Electrons Separately Unveils the Transport Dynamics in Organic Photovoltaics
Author(s) -
Peng Jiajun,
Chen Xiaoqing,
Chen Yani,
Sandberg Oskar J.,
Österbacka Ronald,
Liang Ziqi
Publication year - 2016
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201500333
Subject(s) - materials science , organic solar cell , photovoltaics , optoelectronics , photoelectric effect , organic semiconductor , photovoltaic system , solar cell , lithium fluoride , electron , polymer , composite material , inorganic chemistry , ecology , chemistry , physics , quantum mechanics , biology
We have utilized the metal–insulator–semiconductor charge extraction by linearly increasing voltage (MIS‐CELIV) technique to clarify the hole‐ and electron‐transport properties in benchmark poly(3‐hexylthiophene) (P3HT) and its blend with phenyl‐C61‐butyric acid methyl ester (PCBM) by using a thick lithium fluoride (LiF) as the charge‐blocking layer. Both dark and light MIS‐CELIV are employed to comparatively investigate the differences in the recombination process and charge mobilities in neat P3HT and P3HT:PCBM blends. Our studies quantitatively show that balanced hole and electron transport can be achieved in the P3HT:PCBM blend under light illumination, leading to a high efficiency in the photovoltaic cell. Furthermore, light MIS‐CELIV can be employed as a novel method to directly evaluate the capability of photoelectric conversion of organic photovoltaic materials.