Efficiency limitations in a low band-gap diketopyrrolopyrrole-based polymer solar cell

Title
Efficiency limitations in a low band-gap diketopyrrolopyrrole-based polymer solar cell
Authors
Sebastian Albert-Seifried고두현Sven Hu¨ttnerCatherine KanimozhiSatish PatilRichard H. Friend
Issue Date
2014-04
Publisher
Physical chemistry chemical physics : PCCP
Citation
VOL 16, NO 14, 6743-6752
Abstract
We report the performance and photophysics of a low band-gap diketopyrrolopyrrole-based copolymer used in bulk heterojunction devices in combination with PC71BM. We show that the short lifetime of photogenerated excitons in the polymer constitutes an obstacle towards device efficiency by limiting the diffusion range of the exciton to the donor–acceptor heterojunction. We employ ultrafast transient-probe and fluorescence spectroscopy techniques to examine the excited state loss channels inside the devices. We use the high boiling point solvent additive 1,8-diiodooctane (DIO) to study the photoexcited state losses in different blend morphologies. The solvent additive acts as a compatibiliser between the donor and the acceptor material and leads to smaller domain sizes, higher charge formation yields and increased device efficiency.
URI
http://pubs.kist.re.kr/handle/201004/47984
ISSN
14639076
Appears in Collections:
KIST Publication > Article
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