Relaxation of Photogenerated Carriers in P3HT:PCBM Organic Blends

被引：23

作者：

Moehl, Thomas ^{[1
]}

Kytin, Vladimir G. ^{[2
]}

Bisquert, Juan ^{[1
]}

Kunst, Marinus ^{[3
]}

Bolink, Henk J. ^{[4
]}

Garcia-Belmonte, Germa ^{[1
]}

机构：

[1] Univ Jaume 1, Dept Fis, Photovolta & Optoelect Devices Grp, Castellon de La Plana 12071, Spain

[2] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia

[3] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany

[4] Univ Valencia, Inst Ciencia Mol, Valencia, Spain

来源：

CHEMSUSCHEM | 2009年 / 2卷 / 04期

关键词：

solar cells; charge carriers; photochemistry; transport; polymer blends; HETEROJUNCTION SOLAR-CELLS; AMORPHOUS-SILICON; CHARGE-TRANSPORT; REGIOREGULAR POLY(3-HEXYLTHIOPHENE); TRANSIENT PHOTOCONDUCTIVITY; CONDUCTIVITY MEASUREMENTS; BULK HETEROJUNCTIONS; MOBILITY; SEMICONDUCTORS; SPECTROSCOPY;

D O I：

10.1002/cssc.200900002

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The after-pulse time-resolved microwave conductivity (TRMC) decays observed in P3HT:PCBM blends display a dependence on time close to t(-beta), independent of excitation intensity, in the 10 ns-1 mu s range. This is explained in terms of the relaxation of carriers in a Gaussian density of states (DOS). The model is based on a demarcation level that moves with time by thermal release and retrapping of initially trapped carriers. The model shows that when the disorder is large the after-pulse decay of the type t(-beta) is obtained, while at low disorder and large temperature the carrier distribution becomes independent of time. In the measurements different beta values were observed depending on the solvent used for spin-coating: 0.4-0.6 for chlorobenzene and 0.3-0.4 for toluene. The model was applied to extract the shape of the DOS from the TRMC decays, giving a dispersion parameter of about 120 meV for blends with high P3HT content.

引用

页码：314 / 320

页数：7

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