Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 354, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2022.118868
Keywords
Discotic materials; Liquid crystals; Self-organization; Organic photovoltaics; Solar cells
Funding
- Polish National Centre of Research and Development [TECHMATSTRATEG1/347431/14/NCBR/2018]
- Czech Science Foundation [CSF 22-16499S]
- European Structural and Investment Funds
- Czech Ministry of Education, Youth and Sports [SOLID21-CZ.02.1.01/0.0/0.0/16_019/0000760]
- Czech Academy of Sciences [TWN-18-01]
- Ministry of Science and Technology of Taiwan [MOST 107-3017-F-027-001, MOST 110-2113-E-027-009]
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Three new discotic liquid crystalline compounds were used as smart dopants in organic solar cells to achieve one-dimensional charge transportation. The power conversion efficiency of the cells was found to be strongly influenced by the molecular conformation and specific amount of dopants in the active layer.
Three new discotic liquid crystalline (DLC) penta(phenylethynyl)benzene derivatives (HSC0X, X = 1-3) in nonchiral, homogeneously chiral, and racemic conformations were used as smart dopants between poly [[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][s-fluoro-2-[2-ethylhexyl]carbonyl] thirno[3,4-b]thiophene- diyl]](PTB7) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) which can achieve one-dimensional (1D) charge transportation for organic solar cells (OSCs). All HSC0X exhibits columnar rectangular phase stability over a reasonably broad temperature and is characterized by powder X-ray analysis and polarized optical microscopy (POM). The thermal imaging revealed the best homogeneity of heat distribution for devices PTB7:PC71BM:HSC0X ternary active layer with resistance value 26.4-53.5 X. The resulting power conversion efficiency (PCE) values were strongly dependent on the molecular conformation and specific amount of the dopants in an active layer. A narrow band gap at 1.01 eV was found for the nonchiral discotic material (HSC01) as well as a low-lying highest occupied molecular orbital (HOMO) energy level of ti -5.34 eV and the best PCE of 3.02%. (c) 2022 Elsevier B.V. All rights reserved.
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