Optimization of the Bulk Heterojunction Composition for Enhanced Photovoltaic Properties: Correlation between the Molecular Weight of the Semiconducting Polymer and Device Performance

被引：57

作者：

Nicolet, Celia ^{[1
,2
]}

Deribew, Dargie ^{[1
,2
]}

Renaud, Cedric ^{[1
,2
]}

Fleury, Guillaume ^{[1
,2
]}

Brochon, Cyril ^{[1
,2
]}

Cloutet, Eric ^{[1
,2
]}

Vignau, Laurence ^{[3
,4
]}

Wantz, Guillaume ^{[3
,4
]}

Cramail, Henri ^{[1
,2
]}

Geoghegan, Mark ^{[1
,2
,5
]}

Hadziioannou, Georges ^{[1
,2
]}

机构：

[1] Univ Bordeaux, Lab Chim Polymeres Organ, IPB ENSCBP, F-33607 Pessac, France

[2] CNRS, Lab Chim Polymeres Organ, UMR 5629, F-33607 Pessac, France

[3] Univ Bordeaux, Lab Integrat Mat Syst, IPB ENSCBP, F-33607 Pessac, France

[4] CNRS, Lab Integrat Mat Syst, UMR 5218, F-33607 Pessac, France

[5] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2011年 / 115卷 / 44期

关键词：

OPEN-CIRCUIT VOLTAGE; SOLAR-CELLS; REGIOREGULAR POLY(3-HEXYLTHIOPHENE); BLOCK-COPOLYMERS; CHARGE-TRANSPORT; THIN-FILMS; MORPHOLOGY; BLENDS; GROWTH; POLYTHIOPHENE;

D O I：

10.1021/jp207669j

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：

Herein we propose an approach toward the optimization of the photovoltaic performance of bulk heterojunctions by tuning the composition of the active layer with respect to the molecular weight of the semiconducting polymer. We used a poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) blend as a typical system and varied the molecular weight of the P3HT semiconducting polymer in order to determine its influence on the bulk heterojunction morphology as well as on the optoelectronic characteristics of the device. We have systematically mapped out the phase diagram for different molecular weight P3HTs blended with PCBM and observed the presence of a eutectic composition, which shifts to higher content of P3HT for lower molecular weight P3HTs. This shift inherent to the P3HT molecular weight is also apparent in the photovoltaic performance as the eutectic composition corresponds to the best of the photovoltaic properties. The P3HT molecular weight dependence of the eutectic composition is due to the molecular weight dependence of the P3HT crystallization behavior, which leads to dramatic morphological changes of the bulk heterojunction.

引用

页码：12717 / 12727

页数：11

共 74 条

[1] The effect of poly(3-hexylthiophene) molecular weight on charge transport and the performance of polymer:fullerene solar cells [J].