Quantifying Charge Extraction in Organic Solar Cells: The Case of Fluorinated PCPDTBT

被引:85
作者
Albrecht, Steve [1 ]
Tumbleston, John R. [2 ]
Janietz, Silvia [3 ]
Dumsch, Ines [4 ]
Allard, Sybille [4 ]
Scherf, Ullrich [4 ]
Ade, Harald [2 ]
Neher, Dieter [1 ]
机构
[1] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany
[2] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA
[3] Fraunhofer Inst Angew Polymerforsch, D-14476 Potsdam, Germany
[4] Berg Univ Wuppertal, Inst Polymertechnol, D-42097 Wuppertal, Germany
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2014年 / 5卷 / 07期
关键词
OPEN-CIRCUIT VOLTAGE; RECOMBINATION DYNAMICS; HOLE-TRANSPORT; GENERATION; PHOTOCURRENT; DEPENDENCE; MORPHOLOGY; SEPARATION; POLYMERS; MOBILITY;
D O I
10.1021/jz500457b
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We introduce a new and simple method to quantify the effective extraction mobility in organic solar cells at low electric fields and charge carrier densities comparable to operation conditions under one sun illumination. By comparing steady-state carrier densities at constant illumination intensity and under open-circuit conditions, the gradient of the quasi-Fermi potential driving the current is estimated as a function of external bias and charge density. These properties are then related to the respective steady-state current to determine the effective extraction mobility. The new technique is applied to different derivatives of the well-known low-band-gap polymer PCPDTBT blended with PC70BM. We show that the slower average extraction due to lower mobility accounts for the moderate fill factor when solar cells are fabricated with mono- or difluorinated PCPDTBT. This lower extraction competes with improved generation and reduced nongeminate recombination, rendering the monofluorinated derivative the most efficient donor polymer.
引用
收藏
页码:1131 / 1138
页数:8
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