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

Albert-Seifried, Sebastian and Ko, Doo-Hyun and Huettner, Sven and Kanimozhi, Catherine and Patil, Satish and Friend, RichardH (2014) Efficiency limitations in a low band-gap diketopyrrolopyrrole-based polymer solar cell. In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16 (14). pp. 6743-6752.

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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.

Item Type:	Journal Article
Publication:	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	Copyright for this article belongs to the ROYAL SOC CHEMISTRY, ENGLAND
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	15 May 2014 07:31
Last Modified:	15 May 2014 07:31
URI:	http://eprints.iisc.ac.in/id/eprint/48998

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