Inorganic Nanocomposites of n‐ and p‐Type Semiconductors: A New Type of Three‐Dimensional Solar Cell

A new approach to the ‘3D solar‐cell concept’ is reported. Atomic layer chemical vapor deposition is employed to infiltrate CuInS2 into the pores of nanostructured TiO2. In this way it is possible to obtain a nanometer‐scale interpenetrating network between n‐type TiO2 and p‐type CuInS2. Cells created this way show photovoltaic activity with a maximum monochromatic incident photon‐to‐ current conversion efficiency of 80 %.