High quantum efficiency polymer photoconductors using interdigitated electrodes

In this letter the authors investigate photoconductivity in interdigitated lateral photoconductors with aluminum contacts, and a poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene]/ {6}-1-(3-(methoxycarbonyl)propyl)-{5}-1-phenyl-[6,6]-C61 blend as the active layer. They demonstrate quantum efficiencies over 70% in 5 mu m devices. The quantum efficiency spectra follow the absorbance spectra and are not corrected for incomplete absorption of the films. The quantum efficiency is a monotonically increasing function of applied field. The field dependence can be explained with a modified Onsager model for charge dissociation.