Functionalized methanofullerenes used as n-type materials in bulk-heterojunction polymer solar cells and in field-effect transistors
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- Functionalized methanofullerenes used as n-type materials in bulk-heterojunction polymer solar cells and in field-effect transistors
- Yang, Changduk; Kim, Jin Young; Cho, Shinuk; Lee, Jae Kwan; Heeger, Alan J.; Wudl, Fred
- PHOTOINDUCED ELECTRON-TRANSFER; THIN-FILM TRANSISTORS; OPEN-CIRCUIT VOLTAGE; PHOTOVOLTAIC CELLS; BUCKMINSTERFULLERENE; PERFORMANCE; DERIVATIVES; EFFICIENT; C-60
- Issue Date
- AMER CHEMICAL SOC
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.130, no.20, pp.6444 - 6450
- The synthesis of two well-solubilized 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/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 methanofullerenes as n-type materials with respect to organic solar cells and OFET applications.
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