期刊
THIN SOLID FILMS
卷 516, 期 9, 页码 2743-2746出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2007.04.098
关键词
regioregular poly(3-alkylthiophene); photocurrent; surface-type cell; bimolecular recombination
We have studied steady-state photocurrents of regioregular poly(3-alkylthiophene)/C-60 composite on surface-type photocells formed with Au electrodes. The photocurrent is observed above 1.4 eV, in agreement with the light-induced ESR measurements on the composite. The photocurrent is small up to 1.8 eV and then increases abruptly at 1.9 eV and keeps increasing up to 3 eV. The action spectra is not symbatic nor antibatic with the optical absorption spectra. The exponent n of the light intensity I dependence of the photocurrent P, P proportional to I-n, is close to n = 0.5 above 1.9 eV, indicating the involvement of the bimolecular recombination. Below 1.9 eV, n is between 0.5 and 1, indicating the contribution of the monomolecular process. The change in the exponent is understood by a universal curve as a function of the photoexcitation density taking account of the fraction of the incident light absorbed and the optical penetration depth. (C) 2007 Elsevier B.V. All rights reserved.
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