Abstract: Sunlight may be converted into electrical or chemical energy by semiconductors composed of suitably doped polymers (e.g. polyaeetylene). The mobility of the dopant in the polymer is significant and the concentration of dopant is not uniform in the semiconductor polymer because of the electric field in the space-charge region. The theoretical treatment for traditional semiconductor, even the depletion layer approximation cermet be applied to this case. It is interesting to study quantitatively the distributions of concenrations of dopant and carriers as well as the electric potential and field. In order to search for polymer semiconductor material as photoelectrode of high performance, it is necessary to study quantitative relationships between the conversion efficiency and various parameters of the semiconductor bulk properties.
For the steady state of a planar n-type semiconductor illuminated by monochromatic light, the following six simultaneous differential equations can be formulated:
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