The effect of branched versus linear alkyl side chains on the bulk heterojunction photovoltaic performance of small molecules containing both benzodithiophene and thienopyrroledione
SCIE
SCOPUS
- Title
- The effect of branched versus linear alkyl side chains on the bulk heterojunction photovoltaic performance of small molecules containing both benzodithiophene and thienopyrroledione
- Authors
- Kim, YJ; Park, KH; Ha, JJ; Chung, DS; Kim, YH; Park, CE
- Date Issued
- 2014-01
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- To evaluate the effect of side chain characteristics on the photovoltaic performance of small molecules containing both benzodithiophene (BDT) and thienopyrroledione (TPD), we designed and synthesized two such molecules, one containing a branched 2-ethylhexyl (2EH) side chain on the BDT unit (BDTEH-TTPD) and the other containing a linear n-octyl (C-8) side chain on the BDT unit (BDTO-TTPD). The optical and electrochemical properties and crystalline structures of these molecules were examined. Compared to BDTO-TTPD, BDTEH-TTPD showed stronger light absorption, longer-range ordering and shorter pi-pi stacking distances between backbones. As a result, the power conversion efficiency of a bulk heterojunction solar cell based on BDTEH-TTPD (2.40%) was substantially higher than that of the BDTO-TTPD device (1.12%).
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11918
- DOI
- 10.1039/C4CP00077C
- ISSN
- 1463-9076
- Article Type
- Article
- Citation
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS, vol. 16, no. 37, page. 19874 - 19883, 2014-01
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