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

来源：

ADVANCED ENERGY MATERIALS | 2011年 / 1卷 / 01期

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

页码：73 / 81

页数：9

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