Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

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JUNE 28 WEDNESDAY AFTERNOON JS1-WeA-P.3 OPTICAL CHARACTERIZATION OF VACUUM EVAPORATED CdZnTe THIN FILMS DEPOSITED BY STACKED LAYER METHOD. G.G. Rusu, M. Rusu, M. Girtan. Faculty of Physics, “Al.I. Cuza” University, B-dul Carol I, No. 11, Iasi, Romania (e-mail: rusugxg@uaic.ro) The interest in the study of CdZnTe (CZT) alloys in thin films has been increased due to their important applications in technology of thin film devices as solar cells, photo-detectors, gamma-ray detectors, etc. Among other preparation techniques of CZT, the physical vapour deposition is often preferred. In such method, the evaporation of CdTe and ZnTe mixed powder or co-evaporation from dual CdTe and ZnTe sources are frequently used. An inconvenient of these procedures is the difficulty to control of Zn content in as evaporated CdZnTe films due to the vapour pressure difference between CdTe and ZnTe and to the lower sticking coefficient of Zn. To avoid this inconvenient, in present paper, a modified two source evaporation technique was used to prepare CdZnTe thin films. Namely, during film deposition, the film substrates, placed onto a rotating disk, passed successively with constant rate over the CdTe powder and metallic Zn evaporation sources respectively, separated between them by two glass cylinders. In this way, nanolayered CdTe/Zn structures with uniform Zn content were deposited. The structural and optical properties of as deposited CdZnTe films were investigated. Depending on the preparation conditions, both quasi-amorphous and oriented (111) polycrystalline films were obtained. Also, depending on Zn content and heat treatment, the value of optical band gap, E g , for studied films ranged between 1.48 eV and 1.63 eV. 126
JUNE 28 WEDNESDAY AFTERNOON JS1-WeA-P.2 STUDY OF OPTICAL PROPERTIES OF DIAMOND LIKE CARBON /POROUS SILICON ANTIREFLECTION COATING LAYERS FOR MULTICRYSTAL- LINE SILICON SOLAR CELL APPLICATIONS. K. Ait-Hamouda. Labo Instrumentation, Faculté d’Electronique et informatique, USTHB, BP 32 El-Alia Bab-ezouar Alger, Algérie. M. Ouchabane. CDTA , Haouche Loukil BP<strong>17</strong>, Baba-Hassen Alger, Algérie. A. Ababou. Labo Instrumentation, Faculté d’Electronique et informatique, USTHB, BP 32 El-Alia Bab-ezouar Alger, Algérie. N. Gabouze. UDTS, 2Bd Frantz Fanon BP 399, Alger Algérie In the past decade, Diamond Like Carbon (DLC) coatings have received great attention essentially due to their unique properties such as mechanical hardness, adhesion strength and chemical inertness, and recently in the sensing application, combined with porous silicon. In addition, the same research group demonstrates an enhancement of the photoluminescence of the porous layer subjected to a DLC layer deposition. In this work, we report a study on some optical properties of DLC films. The DLC films have been deposited by DC discharge plasma enhanced chemical vapor deposition. The deposited layers have been characterized by spectrophotometry, ellipsometry and FTIR analysis. The evolution of optical properties for different DLC thickness layers has been correlated with the FTIR spectra change. In addition, The DLC films have been deposited on multicrystalline solar cell with a PS film (< 0.3 μm) as an antireflection coating. The results reveal that the solar cell efficiency strongly depends on the DLC layer thickness. The quantum efficiency of the solar cell coated with a DLC layer increases by 5% order than the uncoated cell. 125
Page 1 and 2: Wüest M. 51 Wykes M. 82 Yamaguchi
Page 3 and 4: Oliveira F. J. 140 Orts M.J. 76 Ota
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Sigilum Universitatis Studii Salama
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