A Small Molecule Non-fullerene Electron Acceptor for Organic Solar Cells

被引:150
作者
Schwenn, Paul E. [1 ]
Gui, K. [1 ]
Nardes, Alexandre M. [2 ]
Krueger, Karsten B. [1 ]
Lee, Kwan H. [1 ]
Mutkins, Karyn [1 ]
Rubinstein-Dunlop, Halina [3 ]
Shaw, Paul E. [1 ]
Kopidakis, Nikos [2 ]
Burn, Paul L. [1 ]
Meredith, Paul [1 ]
机构
[1] Univ Queensland, Ctr Organ Photon & Elect, Brisbane, Qld 4072, Australia
[2] Natl Renewable Energy Lab, Golden, CO 80401 USA
[3] Univ Queensland, Sch Math & Phys, Brisbane, Qld 4072, Australia
基金
澳大利亚研究理事会;
关键词
OPEN-CIRCUIT VOLTAGE; CONJUGATED POLYMER; POLY(3-HEXYLTHIOPHENE); EFFICIENT; DEPENDENCE; MORPHOLOGY; NETWORK; DESIGN;
D O I
10.1002/aenm.201000024
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
Organic bulk heterojunction photovoltaic devices predominantly use the fullerene derivatives [C60]PCBM and [C70]PCBM as the electron accepting component. This report presents a new organic electron accepting small molecule 2-[{7-(9,9-di-n-propyl-9H-fluoren-2-yl)benzo[c][1,2,5]thiadiazol-4-yl} methylene] malononitrile (K12) for organic solar cell applications. It can be processed by evaporation under vacuum or by solution processing to give amorphous thin films and can be annealed at a modest temperature to give films with much greater order and enhanced charge transport properties. The molecule can efficiently quench the photoluminescence of the donor polymer poly(3-n-hexylthiophene-2,5-diyl)(P3HT) and time resolved microwave conductivity measurements show that mobile charges are generated indicating that a truly charge separated state is formed. The power conversion efficiencies of the photovoltaic devices are found to depend strongly on the acceptor packing. Optimized K12: P3HT bulk heterojunction devices have efficiencies of 0.73 +/- 0.01% under AM1.5G simulated sunlight. The efficiencies of the devices are limited by the level of crystallinity and nanoscale morphology that was achievable in the blend with P3HT.
引用
收藏
页码:73 / 81
页数:9
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