Cited 13 time in webofscience Cited 13 time in scopus

Highly Systematic and Efficient HOMO-LUMO Energy Gap Control of Thiophene-Pyrazine-Acenes

Title
Highly Systematic and Efficient HOMO-LUMO Energy Gap Control of Thiophene-Pyrazine-Acenes
Authors
Brownell, LV[Brownell, Lacie V.]Robins, KA[Robins, Kathleen A.]Jeong, Y[Jeong, Youngjun]Lee, Y[Lee, Youngu]Lee, DC[Lee, Dong-Chan]
DGIST Authors
Jeong, Y[Jeong, Youngjun]; Lee, Y[Lee, Youngu]
Issue Date
2013-12-05
Citation
Journal of Physical Chemistry C, 117(48), 25236-25247
Type
Article
Article Type
Article
Keywords
Bulk-Heterojunction Organic Solar CellsCollaborative ApproachDNA SequencesDonor-Acceptor-Donor MoleculesDonor-Acceptor CombinationsDonor Acceptor DonorsEnergy GapHeterojunctionsHomo and Lumo EnergiesMoleculesPower Conversion EfficienciesSelf-Assembled ClustersSolidsThiophene
ISSN
1932-7447
Abstract
We report a series of unique and simple donor-acceptor-donor molecular systems that provide compelling insights into the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) energy gap. In this system, thiophene and pyrazine-acene were employed as a donor and an acceptor, respectively. More specifically, acceptor moieties are a combination of phenazine, bisphenazine, and thiadiazole. These donor and acceptor units are well-known primarily for generating low band gap polymers, however a systematic study on why these donor-acceptor combinations are successful has yet to be investigated. In this study, we attempt to gain a fundamental understanding about how these specific donor and acceptors impact the energetics of the resulting molecular systems. A combination of theoretical and experimental methods was used to explore the impact of geometry on the HOMO and LUMO energies. One of the most critical findings is that the dihedral angle between the donor and acceptor influences the HOMO energy predominantly while having very little impact on the LUMO energy, verified experimentally with a perfectly planar system and a closely related nonplanar counterpart. With this collaborative approach, we effectively produced a simple molecular system with an unusually small energy gap of 1.43 eV. The donor-acceptor-donor molecules showed an exceptional ability to produce one-dimensional self-assembled clusters by solution casting, with one in particular exhibiting bundles of ca. 100-200 nm width which is composed of ca. 10 nm width nanotapes. Finally, bulk heterojunction organic solar cell performance is tested using the donor-acceptor-donor molecule as an interlayer between P3HT/PC60BM blend and Al cathode. Power conversion efficiency was improved by 13% compared to the bulk heterojunction without the interlayer. © 2013 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/3170
DOI
10.1021/jp407269p
Publisher
American Chemical Society
Related Researcher
  • Author Lee, Youn Gu Organic & Printed Electronics Laboratory(OPEL)
  • Research Interests OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지; OLED; Printed Electronics
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Collection:
Energy Science and EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles


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