Hybrid solar cells based on the combination of conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polystyrenesulfonate (PSS) and inorganic semiconductor CuIn(S,Se)(2) (CISSe) were investigated. The CuInSe2 (CISe) absorber layers were electrodeposited on ITO covered glasses from aqueous solutions with various ratios of elements. The ITO/ln(O,S)/CISSe photovoltaic (PV) junctions were prepared by the sulfurization of ITO/ CISe precursors at 450 degrees C in the H2S atmosphere. The PEDOT-PSS layer of p-type is considered an alternative to the traditional window top layer on the CISSe absorber layer in the cell structure. The polymer deposition was performed by help of the spin-casting technique. PV properties of the prepared ITO/ln(O,S)/CISSe and ITO/In(O,S)/CISSe/PEDOT-PSS structures were studied, with emphasis on the role of conductive polymer layer in the cell structure. (c) 2004 Elsevier B.V. All rights reserved.