On the Field Dependence of Free Charge Carrier Generation and Recombination in Blends of PCPDTBT/PC70BM: Influence of Solvent Additives

被引：147

作者：

Albrecht, Steve ^{[1
]}

Schindler, Wolfram ^{[2
]}

Kurpiers, Jona ^{[1
]}

Kniepert, Juliane ^{[1
]}

Blakesley, James C. ^{[1
]}

Dumsch, Ines ^{[3
]}

Allard, Sybille ^{[3
]}

Fostiropoulos, Konstantinos ^{[2
]}

Scherf, Ullrich ^{[3
]}

Neher, Dieter ^{[1
]}

机构：

[1] Univ Potsdam, Soft Matter Phys, Inst Phys & Astron, D-14476 Potsdam, Germany

[2] Helmholtz Zealum Berlin Mat & Energie, D-14109 Berlin, Germany

[3] Berg Univ Wuppertal, Inst Polymer Technol, D-42097 Wuppertal, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2012年 / 3卷 / 05期

关键词：

POLYMER SOLAR-CELLS; TRANSFER EXCITONS; EFFICIENCY; DONOR; ORDER;

D O I：

10.1021/jz3000849

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 have applied time-delayed collection field (TDCF) and charge extraction by linearly increasing voltage (CELIV) to investigate the photogeneration, transport, and recombination of charge carriers in blends composed of PCPDTBT/PC70BM processed with and without the solvent additive diiodooctane. The results suggest that the solvent additive has severe impacts on the elementary processes involved in the photon to collected electron conversion in these blends. First, a pronounced field dependence of the free carrier generation is found for both blends, where the field dependence is stronger without the additive. Second, the fate of charge carriers in both blends can be described with a rather high bimolecular recombination coefficients, which increase with decreasing internal field. Third, the mobility is three to four times higher with the additive. Both blends show a negative field dependence of mobility, which we suggest to cause bias-dependent recombination coefficients. SECTION: Macromolecules, Soft Matter

引用

页码：640 / 645

页数：6

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