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Modulated Photocurrent Spectroscopy for Determination of Electron and Hole Mobilities in Working Organic Solar Cells.

Abstract：

:Carrier drift mobility is an important physical constant in the charge transport process of organic solar cells (OSCs). Although time-of-flight and space-charge-limited current techniques have been frequently utilized for mobility measurements, the validity of a new method using modulation photocurrent spectroscopy is discussed in this contribution. The advantages of this method are its applicability to working OSCs with optimized device structures and the simultaneous determination of the electron and hole mobilities. These features make it possible to study the relation between the mobility balance and the solar cell characteristics, such as the power conversion efficiency, using only a single working OSC; hence, it is not necessary to fabricate electron-only and hole-only devices for mobility measurements. After carrying out numerical simulations to examine the validity of this method for mobility determination, the dependence of the mobility balance on the mixing ratio of the electron-donor and -acceptor materials is presented.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Nojima H,Kobayashi T,Nagase T,Naito H

doi

10.1038/s41598-019-56945-3

subject

Has Abstract

pub_date

2019-12-30 00:00:00

pages

20346

issue

1

issn

2045-2322

pii

10.1038/s41598-019-56945-3

journal_volume

9

pub_type

杂志文章

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