Elsevier

Thin Solid Films

Volume 111, Issue 2, 13 January 1984, Pages 93-103
Thin Solid Films

Electronics and optics
Electrochemically grown polythiophene and poly(3-methylthiophene) organic photovoltaic cells

https://doi.org/10.1016/0040-6090(84)90478-4Get rights and content

Abstract

Electrochemically grown polythiophene and poly(3-methylthiophene) films were used for the fabrication of Al/polymer/Au photovoltaic sacdwich cells. A power efficiency, corrected for absorption by the aluminium layer, of 4% under monochromatic (470 nm) low level (0.8 μ W cm−2) illumination is reported. A significant decrease in the efficiency with increasing light power is observed (e.g. 0.007% for polychromatic xenon light at 1 m W cm−2). The linear variation in the photocurrent with the incident light power at low illumination suggests that the primary carrier generation mechanism is a direct band-to-band process with a quantum yield of nearly unity. The sublinear dependence at higher light levels is explained as due to bimolecular recombinations. A low doping level of the polymer films is suggested by the high photoconduction observed at forward bias under illumination. The decay in the photocurrent with time is interpreted as the result of the growth of an aluminium oxide layer at the polymer-aluminium interface.

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