The effect of acceptor end groups on the physical and photovoltaic properties of A-pi-D-pi-A type oligomers with same S, N-heteropentacene central electron donor unit for solution processed organic solar cells
- Authors
- Tee, Hyejeoung; Jo, Hyeonjun; Kim, Dayoung; Biswas, Subhayan; Sharma, Ganesh D.; Ko, Jaejung
- Issue Date
- 6월-2016
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Acceptor-donor-acceptor small molecules; Organic bulk heterojunction solar cells; Two step annealing; Power conversion efficiency
- Citation
- DYES AND PIGMENTS, v.129, pp.209 - 219
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 129
- Start Page
- 209
- End Page
- 219
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88542
- DOI
- 10.1016/j.dyepig.2016.02.029
- ISSN
- 0143-7208
- Abstract
- Synthesis and characterization of novel acceptor donor acceptor small molecules with different end group acceptors such as dicyanovinyl, cyanoacetate and indenedione, denoted as SM1, SM2 and SM3, respectively, linked with same central S, N-heteropentacene donor is described. These small molecules are used as electron donor along with the PC71BM as an electron acceptor for the fabrication of solution processed bulk heterojunction organic solar cells. The optimized devices based on as cast SM1:PC71BM, SM2:PC71BM and SM2:PC71BM showed power conversion efficiency about 2.01%, 1.60% and 2.65%, respectively and improved to 5.64%, 4.24% and 6.64%, respectively, using active layer processed with two steps annealing, i.e. combination of thermal annealing and subsequent solvent vapor annealing. This increase in the power conversion efficiency was due to the enhancement in J(sc) and FF attributed to the enhancement of the light harvesting ability of the active layer, which is reflected by favorable nanoscale morphology. (C) 2016 Elsevier Ltd. All rights reserved.
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Collections - College of Science and Technology > Department of Advanced Materials Chemistry > 1. Journal Articles
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