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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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Functionalized methanofullerenes used as n-type materials in bulk-heterojunction polymer solar cells and in field-effect transistors

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Title
Functionalized methanofullerenes used as n-type materials in bulk-heterojunction polymer solar cells and in field-effect transistors
Author
Yang, ChangdukKim, Jin YoungCho, ShinukLee, Jae KwanHeeger, Alan J.Wudl, Fred
Keywords
PHOTOINDUCED ELECTRON-TRANSFER; THIN-FILM TRANSISTORS; OPEN-CIRCUIT VOLTAGE; PHOTOVOLTAIC CELLS; BUCKMINSTERFULLERENE; PERFORMANCE; DERIVATIVES; EFFICIENT; C-60
Issue Date
200805
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.130, no.20, pp.6444 - 6450
Abstract
The synthesis of two well-solubilized [60]methanofullerene derivatives (p-EHO-PCBM and p-EHO-PCBA) is presented for usage in organic solar cells and in field-effect transistors. The para position of the PCBM's phenyl ring was substituted with a branched alkoxy side chain, which contributes to higher solubility, facilitating synthesis, purification, and processing. We find a small change of the open-circuit voltage (V(oc)) as a slight improvement in performance upon application in P3HT/[60]methanofullerene bulk-heterojunction-photovoltaic cells, when compared to PCBM, because of the electron donation of the alkoxy group. In the case of the devices with a TiO(x) layer, the best power conversion efficiencies (PCE, eta(e)) is observed in a layered structure of P3HT/p-EHO-PCBA/TiO(x) (eta(e) = 2.6%), which slightly exceeds that of P3HT/PCBM/TiO(x) (eta(e) = 2.3%) under conditions reported here. This can be attributed, in part, to the carboxylic acid group in p-EHO-PCBA that leads to an effective interface interaction between the active layer and TiOx phase. In addition, n-channel organic field-effect transistor (OFET) devices were fabricated with thin films of p-EHO-PCBM and p-EHO-PCBA, respectively cast from solution on SiO(2)/Si substrates. The values of field-effect mobility (mu) for p-EHO-PCBM and p-EHO-PCBA are 1 x 10(-2) and 1.6 x 10(-3) cm(2)/V.s, respectively. The results in this paper demonstrate the effects of a carboxylic acid group and an electron-donating substituent in [60]methanofullerenes as n-type materials with respect to organic solar cells and OFET applications.
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DOI
http://dx.doi.org/10.1021/ja710621j
ISSN
0002-7863
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