CORRELATION BETWEEN INTERFACIAL CHEMISTRY AND ELECTROSTATICS AT AN IRRADIATED N-CDTE AQUEOUS FLUORIDE JUNCTION

Three complementary techniques, namely laser Raman spectroscopy, elect rolyte electroreflectance (EER), and capacitance-voltage measurements, were combined to establish a correlation between the interfacial chem istry and electrostatics at an irradiated n-CdTe/aqueous fluoride elec trolyte interface. Thus, supra-bandgap irradiation of the latter was s hown by laser Raman spectroscopy to produce a Te corrosion layer at th e n-CdTe surface. This resulted in an additional voltage drop across t his layer as indicated both by a modification of the EER profile and b y the positive shift in the flatband potential, These new data provide chemical support for an (electrostatic) model proposed by earlier wor kers.