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OPTICAL AND PHOTOELECTRICAL PROPERTIES OF GaS AND CdTe THIN FILMS, COMPONENTS OF GaS/CdTe HETEROJUNCTIONS
(2006) Cuculescu, Elmira; Evtodiev, Igor; Caraman, Mihail; Rusu, Mihaela
In the paper, experimental results concerning the absorption and photosensibility spectral dependence of GaS and CdTe thin film components of GaS/CdTe heterojunctions are presented. GaS films (d = 0.06 μm – 2.8 μm) were deposited onto ITO substrate by laser light pulses. CdTe films (d = 3.6 μm) were deposited onto GaS films by close-spaced sublimation technique. At the fundamental absorption edge, the absorption coefficient of CdTe layers increases of five orders of magnitude in a narrow 40 – 100 meV energy range, up to 4 104cm-1. At room temperature, the energy band of GaS/CdTe heterojunctions photosensitivity is 1.45 eV-2.75 eV, the photocurrent having a constant value up to 2.0 eV photon energy.
ON THE PHOTOMAGNETIC EFFECT IN CdTe THIN FILMS EVAPORATED ONTO UNHEATED SUBSTRATES
(2005) Rusu, George G.; Rusu, Mihaela; Caraman, Mihail
Cadmium telluride (CdTe) thin films (d=500–700 nm) were deposited onto unheated glass substrates by thermal evaporation under vacuum. The dependence of the photomagnetic voltage on the magnetic induction for the as deposited and heat-treated films was investigated. The spectral dependence of the photomagnetic voltage was also investigated. The results are discussed in relation with structural characteristics of the studied films.