Tunable Novel Cyclopentadithiophene-Based Copolymers Containing Various Numbers of Bithiazole and Thienyl Units for Organic Photovoltaic Cell Applications

被引：104

作者：

Li, Kuang-Chieh ^{[5
]}

Huang, Jen-Hsien ^{[2
]}

Hsu, Ying-Chan ^{[1
]}

Huang, Po-Ju ^{[5
]}

Chu, Chih-Wei ^{[3
,4
]}

Lin, Jiann-T'suen ^{[1
]}

Ho, Kuo-Chuan ^{[2
]}

Wei, Kung-Hwa ^{[5
]}

Lin, Hong-Cheu ^{[5
]}

机构：

[1] Acad Sinica, Inst Chem, Taipei, Taiwan

[2] Natl Taiwan Univ, Dept Chem Engn, Taipei 10764, Taiwan

[3] Acad Sinica, Res Ctr Appl Sci, Taipei 115, Taiwan

[4] Natl Chiao Tung Univ, Dept Photon, Hsinchu, Taiwan

[5] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu, Taiwan

来源：

MACROMOLECULES | 2009年 / 42卷 / 11期

关键词：

FIELD-EFFECT TRANSISTORS; POLYMER SOLAR-CELLS; PI-CONJUGATED POLYMERS; BAND-GAP; SEMICONDUCTING POLYMERS; ALTERNATING COPOLYMER; ELECTRON-TRANSPORT; EFFICIENCY; THIOPHENE; POLYTHIOPHENE;

D O I：

10.1021/ma900416d

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Six novel conjugated copolymers (P1-P6) containing coplanar cyclopentadithiophene (CPDT) units (incorporated with bithiazole/thienyl-based monomers) were synthesized and developed for the applications of polymer solar cells (PSCs). Copolymers P1-P6 covered broad absorption ranges from UV to near-infrared (400-800 nm) with narrow optical band gaps of 1.70-1.94 eV, which are compatible with the maximum solar photon reflux. Partially reversible p- and n-doping processes of P1-P6 in electrochemical experiments were observed. Compared with those previously reported CPDT-based narrow band gap polymers, the proper molecular design for HOMO/LUMO levels of P1-P6 induced relatively high photovoltaic open-circuit voltages in the PSC devices. Powder X-ray diffraction (XRD) analyses suggested that these copolymers formed highly self-assembled pi-pi stackings. Under 100 mW/cm(2) of AM 1.5 white-light illumination, bulk heterojunction PSC devices containing an active layer of electron donor copolymers P1-P6 blended with electron acceptor [6,6]-phenyl C-61 butyric acid methyl ester (PCBM) in the weight ratio of 1:1 were explored, and the external quantum efficiency (EQE) measurements showed a maximal quantum efficiency of 60%. The PSC device containing P4 in the weight ratio of 1:2 with PCBM gave the best preliminary result with an overall power conversion efficiency (PCE) of 3.04%, an open-circuit voltage of 0.70 V, a short-circuit current of 8.00 mA/cm(2), and a fill factor of 53.7%.

引用

页码：3681 / 3693

页数：13

共 84 条

[1]

[Anonymous], PHYS REV B

[2]

Asawapirom U, 2001, MACROMOL RAPID COMM, V22, P746, DOI 10.1002/1521-3927(20010701)22:10<746::AID-MARC746>3.0.CO

[3]

2-H

[4] High performance amorphous metallated π-conjugated polymers for field-effect transistors and polymer solar cells [J].