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Author

Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Acid-functionalized fullerenes used as interfacial layer materials in inverted polymer solar cells

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Title
Acid-functionalized fullerenes used as interfacial layer materials in inverted polymer solar cells
Author
Choi, HyosungLee, JunghoonLee, WonhoKo, Seo-JinYang, RenqiangLee, Jeong ChulWoo, Han YoungYang, ChangdukKim, Jin Young
Keywords
Fullerene; Interfacial layer; Inverted polymer solar cells; Self-assembled monolayer; Surface modification
Issue Date
201311
Publisher
ELSEVIER SCIENCE BV
Citation
ORGANIC ELECTRONICS, v.14, no.11, pp.3138 - 3145
Abstract
Two types of carboxylic acid functionalized fullerence derivatives, 4-(2-ethylhexyloxy)-[6,6]-phenyl C61-butyric acid (p-EHO-PCBA) and bis-4-(2-ethylhexyloxy)-[6,6]-phenyl C61-butyric acid (bis-p-EHO-PCBA), were synthesized and investigated as an interfacial layer for inverted polymer solar cells (iPSCs). The -COOH groups on the PCBAs chemisorb to inorganic metal oxide (TiOX ), generating fullerene-based self-assembled monolayers (FSAMs). The devices with the mono- and bis-FSAMs exhibited substantially lower series resistance (RS) values of 2.10 Ω cm2 and 1.46 Ω cm2, compared to that (4.15 Ω cm2) of the unmodified device. The TiOX films modified with mono- and bis-FSAMs showed higher contact angles of 50° and 91°, respectively, than that of the pristine TiOX film (33°). The increased contact angles were attributed to the enhanced hydrophobicity, improving the wetting properties with the organic photoactive layer. In addition, a comparison of device characteristics with electroactive FSAMs and non-electroactive benzoic acid SAMs clearly indicates that the FSAMs may suggest an additional pathway for photo-induced charge transfer and charge collection to ITO. After surface modification with FSAMs, the short-circuit current density (JSC) and fill factor (FF) values increased substantially. The iPSCs based on poly(5,6-bis(octyloxy)-4-(thiophen-2-l)benzo[c][1,2,5]thiadiazole) (PTBT) and [6,6]phenyl-C61-butyric acid methyl ester (PCBM) as an active layer showed remarkably improved power conversion efficiency up to 5.13% through incorporation of the FSAMs-based interfacial layer.
URI
http://scholarworks.unist.ac.kr/handle/201301/4239
DOI
http://dx.doi.org/10.1016/j.orgel.2013.07.027
ISSN
1566-1199
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MNE_Journal Papers
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