Elucidating Double Aggregation Mechanisms in the Morphology Optimization of Diketopyrrolopyrrole-Based Narrow Bandgap Polymer Solar Cells

被引：53

作者：

Gao, Jing ^{[1
]}

Chen, Wei ^{[2
]}

Dou, Letian ^{[1
]}

Chen, Chun-Chao ^{[1
]}

Chang, Wei-Hsuan ^{[1
]}

Liu, Yongsheng ^{[1
]}

Li, Gang ^{[1
]}

Yang, Yang ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

[2] Univ Chicago, Inst Mol Engn, Chicago, IL 60637 USA

来源：

ADVANCED MATERIALS | 2014年 / 26卷 / 19期

基金：

美国国家科学基金会;

关键词：

polymer solar cells; solution-stage morphology; polymer aggregation; polymer crystallization; solvent mixtures; POWER CONVERSION EFFICIENCY; CONJUGATED POLYMERS; PHASE-SEPARATION; SMALL-ANGLE; PERFORMANCE; ACCEPTOR; ADDITIVES; LAYER;

D O I：

10.1002/adma.201305645

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The power conversion efficiency (PCE) of a DPP-based polymer solar cell is significantly improved by using DIO or DCB as processing additives. The discovery that DCB outperforms DIO with a significantly wider solvent mixture operation window suggests different optimization mechanisms. Although both solvent mixture systems involve double aggregation processes, including a similar solution-to-film aggregation, however, two distinct solution-stage aggregations are observed: relatively amorphous polymer aggregates form in the CF-DIO solution, while more crystalline polymer aggregates form in CF-DCB solution. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：3142 / 3147

页数：6

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