Metal-insulator-semiconductor structures with metal-oxide nano-particles in polymeric matrix were fabricated for optoelectronic and photovoltaic applications. Then, the polymer layer has also possibility for an application to flexible devices. The optical absorbance spectra of Cu(2)O, In(2)O(3), and SnO(2) nano-particles with the diameter of 10-50 nm range embedded in the polyimide layer showed a broad absorption peak around 250-300 nm. For the Cu(2)O nano-particles, the optical responsivity under an incident light with wavelength of 260-390 nm was measured about 1.38 x 10(3) A/W at 0 V bias, and the external quantum efficiency appeared about 1.0% between 200 nm and 400 nm. Crown Copyright (C) 2010 Published by Elsevier B. V. All rights reserved.