WORK FUNCTION AND PHOTOEMISSION-STUDIES OF CESIUM-COATED CDTE(100)

The work function and photoemission from p-type CdTe(100) single-cryst al phosphorus doped to approximately 10(15) CM-3 and crystals that wer e subsequently highly doped to approximately 10(19) cm-3 with Li and c overed with submonolayers of Cs were studied. In some instances the ce sium-coated surfaces were modified by deposition of oxygen. Large work -function changes were found in CdTe at the initial deposition stages of Cs indicating the formation of large dipole moments on the CdTe(100 ) substrate. Band-gap-limited (at 1.56 eV) long-wavelength photoemissi on was observed from the above samples. The total spectral photoemissi on for visible and near-infrared regions was determined.