Synthesis and characterization of three small band gap conjugated polymers for solar cell applications

被引:19
作者
Hellstrom, Stefan [1 ]
Lindgren, Lars J. [1 ]
Zhou, Yi [2 ]
Zhang, Fengling [2 ]
Inganas, Olle [2 ]
Andersson, Mats R. [1 ]
机构
[1] Chalmers, Dept Chem & Biol Engn, SE-41296 Gothenburg, Sweden
[2] Linkoping Univ, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, Sweden
基金
瑞典研究理事会;
关键词
ALTERNATING POLYFLUORENE COPOLYMERS; ENERGY-TRANSFER PROCESSES; PHOTOVOLTAIC CELLS; DONOR; HETEROJUNCTION; FLUORENE; DEVICES; CHARGE; PHOTOLUMINESCENCE; DISSOCIATION;
D O I
10.1039/c0py00152j
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We report on a new series of small band gap conjugated polymers utilizing donor-acceptor-donor substructures in the polymer backbone to broaden and extend the optical absorption to longer wavelengths. Three polymers were prepared by Suzuki polymerization, using the same donor-acceptor-donor segment but with different comonomers. The goal was to investigate how the optical and electronic properties of the polymers were influenced by the different comonomers. Electrochemical spectroscopy, using square-wave voltammetry, shows that increasing the electron-donating strength of the comonomer will raise the HOMO energy level of the polymer, resulting in a decreased band gap. This result is also manifested by comparing open-circuit voltages from the corresponding laboratory fabricated solar cells. The best performing photovoltaic cell, based on APFO-Green15/[60]PCBM (1 : 4 w/w), reached a J(sc) of 4.2 mA cm(-2), a V(oc) of 0.73 V, and a FF of 0.54, giving a PCE of 1.7%.
引用
收藏
页码:1272 / 1280
页数:9
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