Abstract
Monograin CdTe powders were grown by recrystallization in isothermal ampoules in the presence of CdCl2 and CdCl2–NaCl liquid phases. The conductivity of n-type CdTe samples quenched from 750°C was high for low sodium concentrations and decreased abruptly by seven orders of magnitude with a simultaneous appearing of photosensitivity at sodium concentrations of CNa=1018 cm−3. A high n-type conductivity is possibly based on the ionization of the chlorine induced donor defects: ClTex→ClTe°+e′. A low conductivity at high Na levels may be connected with the compensation of these donors by acceptors: NaCdx+ClTe°+e′→NaCd′ClTe°. The same complex defect can serve as one of the radiative recombination centers of the 1.4 eV PL band. The 1.4 eV PL band intensity increased with increasing CNa, reached a maximum in the vicinity of CNa=1018 cm−3 and then decreased abruptly. The latter can be caused by NaCd′Nai° or by (NaCd′Nai°)2, serving as s-center of non-radiative recombination.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
