PHOTOVOLTAIC PROPERTIES OF TITANYL PHTHALOCYANINE PERYLENE PIGMENT LAYERED CELLS

A photovoltaic device consisting of two layered organic dyes sandwiched between transparent ITO and semitransparent gold electrodes was fabricated by successive vacuum depositions onto the ITO plate. The organic dyes used are β-type titanyl phthalocyanine (TiOPc)and N,N′-dimethyl-3,4:9,10-perylenebis(dicarboximide) (MPCI). The vacuum-deposited films of these dyes are amorphous, as shown from their X-ray diffraction patterns. The ITO/MPCI(4()OÅ)/ TiOPc(400 Å)/Au cell showed rectification behavior in the dark. The results of the action spectra for short-circuit photocurrent, which flows from the Au to the ITO electrode, indicate that photogeneration of charge carriers takes place at the interface between TiOPc and MPCI. The device responds to light of the wavelength from 400 to 800 nm depending on the direction of irradiation; TiOPc and MPCI act as optical windows to the light from 400 to 600 nm and to the light from 600 to 800 nm, respectively. Conversion efficiencies for the transmitted monochromatic light (470 nm, 720 nm) were ca. 0.35 and 0.39%. © 1990, The Society of Polymer Science, Japan. All rights reserved.