کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1674126 | 1008957 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Photocurrent of regioregular poly(3-alkylthiophene)/fullerene composites in surface-type photocells Photocurrent of regioregular poly(3-alkylthiophene)/fullerene composites in surface-type photocells](/preview/png/1674126.png)
We have studied steady-state photocurrents of regioregular poly(3-alkylthiophene)/C60 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 ∝ In, 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.
Journal: Thin Solid Films - Volume 516, Issue 9, 3 March 2008, Pages 2743–2746