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Author

Kwon, Tae-Hyuk
Energy Recognition
Research Interests
  • Energy transfer, organic solar cells, supercapacitor, ultrasonic spray chemistry, dithienothiophene, iridium complexes, phosphorescent bioapplications

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Molecular Engineering for Enhanced Charge Transfer in Thin-Film Photoanode

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Title
Molecular Engineering for Enhanced Charge Transfer in Thin-Film Photoanode
Author
Kim, Jeong SooKim, Byung-ManKim, Un-YoungShin, HyeonOhNam, Jung SeungRoh, Deok-HoPark, Jun-HyeokKwon, Tae-Hyuk
Keywords
bonding effect; charge injection; intramolecular charge transfer; molecular engineering; self-aggregation
Issue Date
201710
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.9, no.40, pp.34812 - 34820
Abstract
We developed three types of dithieno[3,2-b;2′,3′-d]thiophene (DTT)-based organic sensitizers for high-performance thin photoactive TiO2 films and investigated the simple but powerful molecular engineering of different types of bonding between the triarylamine electron donor and the conjugated DTT π-bridge by the introduction of single, double, and triple bonds. As a result, with only 1.3 μm transparent and 2.5-μm TiO2 scattering layers, the triple-bond sensitizer (T-DAHTDTT) shows the highest power conversion efficiency (η = 8.4%; VOC = 0.73 V, JSC = 15.4 mA·cm–2, and FF = 0.75) in an iodine electrolyte system under one solar illumination (AM 1.5, 1000 W·m–2), followed by the single-bond sensitizer (S-DAHTDTT) (η = 7.6%) and the double-bond sensitizer (D-DAHTDTT) (η = 6.4%). We suggest that the superior performance of T-DAHTDTT comes from enhanced intramolecular charge transfer (ICT) induced by the triple bond. Consequently, T-DAHTDTT exhibits the most active photoelectron injection and charge transport on a TiO2 film during operation, which leads to the highest photocurrent density among the systems studied. We analyzed these correlations mainly in terms of charge injection efficiency, level of photocharge storage, and charge-transport kinetics. This study suggests that the molecular engineering of a triple bond between the electron donor and the π-bridge of a sensitizer increases the performance of dye-sensitized solar cell (DSC) with a thin photoactive film by enhancing not only JSC through improved ICT but also VOC through the evenly distributed sensitizer surface coverage.
URI
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DOI
http://dx.doi.org/10.1021/acsami.7b08098
ISSN
1944-8244
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