Efficiency limitations in a low band-gap diketopyrrolopyrrole-based polymer solar cell
- Efficiency limitations in a low band-gap diketopyrrolopyrrole-based polymer solar cell
- Sebastian Albert-Seifried; 고두현; Sven Hu¨ttner; Catherine Kanimozhi; Satish Patil; Richard H. Friend
- Issue Date
- Physical chemistry chemical physics : PCCP
- VOL 16, NO 14, 6743-6752
- 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.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.