PHOTOPOTENTIAL SPECTRUM FOR ELECTRODEPOSITED CdSe FILMS
Photopotential spectral dependence for electrodeposited CdTe films with thickness d = 2 - 20 μm has been studied. Deposition has been performed on Ni cathode from (1 M CdSO4 + 1 mM TeO2 + 0.05 M H2SO4) electrolyte at 85 °C. The photopotential (a difference between dark potential and light potential of CdTe electrode) measured in 0.1 M Na2SO3 in open circuit reaches its maximum for CdTe films with d = 10 μm. In thicker films, photoelectrochemical activity reduction has been observed, associated with formation of multiphase films containing, along with CdTe, also Te and CdTe1+x phases. Photoelectrochemical behavior of films has been modeled by CdTe/Te heterostructure behavior.