New D-A-D-A-D push-pull organic semiconductors with different benzo[1,2-b:4, 5-b '] dithiophene cores for solution processed bulk heterojunction solar cells
- Authors
- Do, Kwangseok; Cho, Nara; Siddiqui, S. A.; Singh, Surya Prakash; Sharma, Ganesh D.; Ko, Jaejung
- Issue Date
- Sep-2015
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Push-pull organic semiconductors; Bulk heterojunction organic solar cells; Power conversion efficiency; Solvent additives; Small molecules; Solution process
- Citation
- DYES AND PIGMENTS, v.120, pp 126 - 135
- Pages
- 10
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 120
- Start Page
- 126
- End Page
- 135
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92594
- DOI
- 10.1016/j.dyepig.2015.04.012
- ISSN
- 0143-7208
1873-3743
- Abstract
- The synthesis and characterization of two D-A-D-A-D push-pull organic semiconductors based on either his- (2-ethylhexyloxy) benzo [1,2-b:4,5-b'] dithiophene or bis- (triisopropylsilylethynyl) benzodithiophene electron rich core are described. The optical and electrochemical properties of these compounds indicate that these materials can absorb sunlight over a wide spectral range from 350 to 700 nm and exhibit suitable energy levels for efficient exciton dissociation. These small molecules were used as donor coupled with phenyl-C-71-butyric acid methyl ester acceptor for the fabrication of solution processed small molecule bulk heterojunction solar cells. The rigid and -conjugation of the silylacetylene substituted analog pi-extended compared to the hexyloxy substituted analog facilitates intermolecular packing interactions of small pi-pi charge transfer and intermolecular molecule which induce a deep HOMO level, producing a high open circuit voltage of similar to 0.98 V. The achieved PCE was 5.69% when the active layer hexyloxy analog: phenyl-C-71-butyric acid methyl ester was processed with optimized 1-chloronaphathalene additive. (C) 2015 Elsevier Ltd. All rights reserved.
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