Vacuum-Deposited Organic Solar Cells Based on a Dicyanovinyl-Terminated Small-Molecule Donor
- Authors
- Park, Dasom; Jung, In Hwan; Jang, Sung-Yeon; Yim, Sanggyu
- Issue Date
- May-2019
- Publisher
- POLYMER SOC KOREA
- Keywords
- vacuum-deposited organic solar cells; planar-mixed heterojunction; push-pull; small molecule donor
- Citation
- MACROMOLECULAR RESEARCH, v.27, no.5, pp.444 - 447
- Indexed
- SCIE
SCOPUS
KCI
OTHER
- Journal Title
- MACROMOLECULAR RESEARCH
- Volume
- 27
- Number
- 5
- Start Page
- 444
- End Page
- 447
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/14127
- DOI
- 10.1007/s13233-019-7132-2
- ISSN
- 1598-5032
- Abstract
- The design and synthesis of photoactive semiconducting materials with an appropriate band gap and charge transport properties are crucial for developing vacuum-deposited organic solar cells (VD-OSCs). In this work, we synthesized a novel conjugated material, 2,2-(((4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b]dithiophene-2,6-diyl)bis([2,2-bithiophene]-5,5-diyl))bis(methanylylidene))dimalononitrile (BBTBDTM), with a symmetric A--D--A architecture. BBTBDTM contains benzodithiophene as the central donor (D), bithiophene as the conjugated spacer (), and dicyanovinyl as the acceptor (A). This effective push-pull structure gives rise to a bandgap of 1.5 eV and leads to the favorable energy level alignment with the C-60 acceptor that is suitable for solar flux absorption and charge transport in VD-OSCs. Notably, the insertion of the co-deposited BBTBDTM:C-60 layer between the BBTBDTM and C-60 layers improved the interfacial contact between BBTBDTM and C-60. As a result, the power conversion efficiency of the BBTBDTM:C-60-based VDOSCs reaches 1.49% (V-OC of 0.70 V, J(SC) of 4.56 mA cm(-2) and FF of 0.47) under AM 1.5 illumination.
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