期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 21, 页码 10995-11003出版社
AMER CHEMICAL SOC
DOI: 10.1021/am4032289
关键词
polymer solar cells; low-band-gap polymers; N-acyldithienopyrrole; amine-modified fullerene; intetfacial materials
资金
- CSIRO-CAS joint project
- Chinese Scholarship Council
- Flexible Electronics Theme of the CSIRO , Future Manufacturing Flagship
- Future Manufacturing Flagship
- Victorian Organic Solar Cell Consortium (Victorian Department of Primary Industries, Sustainable Energy Research and Development grant, Victorian Department of Business, and the Australian Solar Institute)
- Victorian Department of Primary Industries
- Sustainable Energy Research and Development grant
- Victorian Department of Business, and the Australian Solar Institute
Efficient low-band-gap polymers are one key component for constructing tandem solar cells with other higher-band-gap materials to harvest wide absorption of the solar spectrum. The N-acyldithieno[3,2-b:2',3'-d]pyrrole (DTP) building block is used for making low-band-gap polymers. It is attractive because of its strong donating ability and relatively low highest-occupied-molecular-orbital level in comparison with the N-alkyl DTP building block. However, additional solubilizing groups on the accepting units are needed for soluble donor acceptor polymers based on the N-alkanoyl DTP building block. Combining N-benzoyl DTP with a 4,7-dithieno-2,1,3-benzothiadiazole building block, a polymer with a low band gap of 1.44 eV, delivers a high short-circuit current of 17.1 mA/cm(2) and a power conversion efficiency of 3.95%, which are the highest for the devices with DTP-containing materials. Herein, an alcohol-soluble diamine-modified fullerene cathode interfacial layer improved the device efficiency significantly more than the mono-amine analogue.
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