Synthesis of a New Ladder-Type Benzodi(cyclopentadithiophene) Arene with Forced Planarization Leading to an Enhanced Efficiency of Organic Photovoltaics

被引：94

作者：

Chen, Yung-Lung ^{[1
]}

Chang, Chih-Yu ^{[1
]}

Cheng, Yen-Ju ^{[1
]}

Hsu, Chain-Shu ^{[1
]}

机构：

[1] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu 30010, Taiwan

来源：

CHEMISTRY OF MATERIALS | 2012年 / 24卷 / 20期

关键词：

forced planarization; conjugated polymers; solar cells; additive; POLYMER SOLAR-CELLS; FIELD-EFFECT TRANSISTORS; LOW-BANDGAP POLYMERS; CONJUGATED POLYMERS; HIGHLY EFFICIENT; COPOLYMERS; UNITS; CARBON;

D O I：

10.1021/cm3024082

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 developed a new heptacyclic benzodi(cyclopentadithiophene) (BDCPDT) unit, where 3,7-positions of the central benzo[1,2-b:4,5-b']dithiophenes (BDT) subunit are covalently rigidified with 3-positons of the two external thiophenes by two carbon bridges, forming two external CPDT rings that share two thiophene rings with the central BDT core. The distannyl-BDCPDT building block was copolymerized with 1,3-dibromo-thieno[3,4-c]pyrrole-4,6-dione (TPD) by Stille polymerization to afford a new alternating donor-acceptor copolymer PBDCPDT-TPD. The implementation of forced planarization greatly suppresses the interannular twisting to extend the effective conjugated length and preserve the interactions between the donor and acceptor segments. The device using the PBDCPDT-TPD/PC71BM (1:3 in wt%) blend processed with dimethyl sulfoxide as an additive delivered a marked PCE of 6.6% which represents a significant enhancement compared to the device using the corresponding nonfused polymer analogue with a PCE of 0.2%.

引用

页码：3964 / 3971

页数：8

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