Diketo-pyrrolo-pyrrole-Based Medium Band Gap Copolymers for Efficient Plastic Solar Cells: Morphology, Transport, and Composition-Dependent Photovoltaic Behavior

被引：32

作者：

Chen, Lin ^{[1
,2
]}

Deng, Dan ^{[1
]}

Nan, Yaxiong ^{[1
]}

Shi, Minmin ^{[1
]}

Chan, Paddy K. L. ^{[2
]}

Chen, Hongzheng ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Polymer Sci & Engn, MOE Key Lab Macromolecule Synth & Functionalizat, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China

[2] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 22期

基金：

中国国家自然科学基金;

关键词：

OPEN-CIRCUIT VOLTAGE; CONJUGATED POLYMERS; SEMICONDUCTING POLYMER; SMALL-MOLECULE; MOBILITY; UNITS; CYCLOPENTADITHIOPHENE; PERFORMANCE; TRANSISTORS; BLENDS;

D O I：

10.1021/jp201104s

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：

Two diketo-pyrrolo-pyrrole-based donor-acceptor copolymers, PCPDT-PDPP and PDTP-PDPP, were synthesized and applied as p-type component for bulk heterojunction solar cells. Using a facile molecular engineering of the main chain linking bridge, we have successfully tuned the band gap of the materials from low to medium level, which results in an improved balance between the device open circuit voltage and short circuit current. The power conversion efficiencies of the polymer/PC70BM combinations achieve 2.03% (PCPDT-PDPP) and 1.32% (PDTP-PDPP) without any interface engineering or post-treatment. A totally different composition-dependent photovoltaic behavior was also discovered for each of the two materials, although they share similar donor acceptor (D-A) structure. Morphological and photophysical studies reveal a phase structure dominated, light harvesting subordinated mechanism, in Which some nonkernel molecular level factors, such as the branch chain density and the molecular weight, are found to play important roles.

引用

页码：11282 / 11292

页数：11

共 56 条

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