Growth and characterization of InSe single crystals

Deniz, Derya
In this study, InSe single crystals were grown from the melt using conventional Bridgman-Stockbarger system. The grown crystals were implanted by N-ions to investigate the doping effect. the stoichiometry and the structural features were examined by scanning electron microscope and X-ray diffraction method, respectively. We have observed that the ingot was stoichiometric and the structure was hexagonal. Temperature dependent conductivity and Hall effect measurements were carried out to investigate the electrical properties of as-grown, as-implanted and annealed samples within the temperature range of 80-400 K. To investigate the annealing effect on both the absorption and photoluminescence (PL) spectra, absorption and PL measurements were performed at room temperature. N-implantation reduced the resistivity order from 103 to 101 (O-cm). We have used temperature dependent conductivity and Hall effect measurements to analyze the dominant scattering mechanisms. Hall measurements showed that all the samples had n-type conduction. Absorption measurements showed that InSe had direct band gap. It was observed that annealing had almost no effect an both room temperature absorption and PL spectra of the samples.


Investigation of inse thin film based devices
Yılmaz, Koray; Parlak, Mehmet; Department of Physics (2004)
In this study, InSe and CdS thin films were deposited by thermal evaporation method onto glass substrates. Schottky and heterojunction devices were fabricated by deposition of InSe and CdS thin films onto SnO2 coated glass substrates with various top metal contacts such as Ag, Au, In, Al and C. The structural, electrical and optical properties of the films were investigated prior to characterization of the fabricated devices. The structural properties of the deposited InSe and CdS thin films were examined t...
Formation of semiconductor nanocrystals in sio2 by ion implantation
Serincan, Uğur; Turan, Raşit; Department of Physics (2004)
In this study, we used ion implantation technique to synthesize semiconductor (Ge, Si) nanocrystals in SiO2 matrix. Ge and Si nanocrystals have been successfully formed by Ge and Si implantation and post annealing. Implanted samples were examined by characterization techniques such as TEM, XPS, EDS, SAD, SIMS, PL, Raman and FTIR spectroscopy and the presence of Ge and Si nanocrystals in the SiO2 matrix has been evidenced by these measurements. It was shown that implantation dose, implantation energy, anneal...
Silicon nanocrystals embedded in sio2 for light emitting diode (led) applications
Kulakçı, Mustafa; Turan, Raşit; Department of Physics (2005)
In this study, silicon nanocrystals (NC) were synthesized in silicon dioxide matrix by ion implantation followed by high temperature annealing. Annealing temperature and duration were varied to study their effect on the nanocrystal formation and optical properties. Implantation of silicon ions was performed with different energy and dose depending on the oxide thickness on the silicon substrate. Before device fabrication, photoluminescence (PL) measurement was performed for each sample. From PL measurement ...
Characterization of cds thin films and schottky barrier diodes
Korkmaz, Sibel; Erçelebi, Ayşe Çiğdem; Department of Physics (2005)
CdS thin films were deposited by thermal evaporation method onto glass substrates without any doping. As a result of the structural and electrical investigation it was found that CdS thin films were of the polycrystalline structure and n-type; and of the transmission analysis optical band gap was found to be around 2.4 eV. Temperature dependent conductivity measurements were carried out in the range of 180 K ا 400 K. The dominant conduction mechanism is identified as tunnelling between 180 K ا 230 K and the...
Investigation of structural, electrical and optical properties of CU1-XAGXINSE2 thin films as a function of X content
Güllü, Hasan Hüseyin; Parlak, Mehmet; Department of Physics (2010)
In this work, we will focus on the quaternary system Cu1-xAgxInSe2 (CAIS) to investigate the effects of silver (Ag) contribution and exchange with copper (Cu) in CuInSe2. This system is located between the ternary semiconducting chalcopyrite compounds CuInSe2 and AgInSe2. These are two most popular materials applied in photovoltaic cells because of their high optical absorption coefficient, which is an important factor for the manufacture of devices, direct energy gap with values Eg ~1.05 and 1.24 eV, respe...
Citation Formats
D. Deniz, “Growth and characterization of InSe single crystals,” M.S. - Master of Science, Middle East Technical University, 2004.