Abstract
The photo-electrical behavior of n-Si/orange dye/conductive glass and p-Si/orange dye/conductive glass sandwich type cells were investigated. In these cells crystal silicon of n-type and p-type and conductive glass (CG) electrodes were employed and the aqueous solution of organic dye (OD) was used as an electrolyte in the distilled water. Under filament lamp illumination, photo-induced open-circuit voltage and shortcircuit current exponentially dropped with time for the n-Si/orange dye/CG cell. In the p-Si/orange dye/CG cell, the photovoltaic effect was not observed. The n-Si/OD/CG cell showed high photo-electrical response under illumination. In the light-voltage/current conversion, these cells behaved as a differentiator and exhibited charge-storage properties.
Highlights
Characterization of organic semiconductors and studies of the photo-electric and photo-electrochemical cells based on organic semiconductors have attracted considerable interest [116]
The Eredox is defined with reference to standard hydrogen electrode (SHE)
In order to identify the electronic energy levels at the interface between the semiconductor and the electrolyte, we investigated visible absorption spectrum of orange dye aqueous solution (Fig. 3)
Summary
Characterization of organic semiconductors and studies of the photo-electric and photo-electrochemical cells based on organic semiconductors have attracted considerable interest [116]. The present paper is one of a series on the characterization of OD and its use as an organic semiconductor which have to date concerned with the investigations of electrical properties of the OD films deposited from aqueous solution at high gravity conditions [20] and a two-layer structure, poly-N-epoxipropylcarbazole/OD heterojunction, that has shown a rectification behavior [21].
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