May 17, 2022 Thesis Open Access

TOLA KASAHUN

DCAT Export

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    <dct:title>THEORETICAL ESTIMATION OF OPTICAL PROPERTIES OF NANOPOROUS GERMANIUM QUANTUM DOT</dct:title>
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        <foaf:name>BERISO (MSC, Assistant Prof. ADEM</foaf:name>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2022-05-17</dct:issued>
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    <dct:description>&lt;p&gt;Germanium is one of semiconductor materials in group IV which has an indirect band gap of ~ 0.67 eV at room temperature. Size dependent optical properties of germanium (Ge) nanomaterial make them an attractive material for optoelectronic applications. In this thesis work, we calculate the optical absorption coefficient, imaginary part of the dielectric function and the oscillator strength near the band edge for Nano porous Germanium by using the dipole matrix element together with the joint density of states between valence and conduction band states. In our calculation, we find that the optical absorption coefficient, oscillator strength and the imaginary part of the dielectric function are explicit function of photon energy and band gap energy but implicit function of the Nano porous semiconductors Ge size through band gap energy. The porosity level and surface effects are incorporated through empirical parameters 𝛾 and 𝜎 . In our results we find that optical absorption coefficient and the imaginary part of the dielectric function slowly increase and then sharply decrease but oscillator strength increases as size of the germanium nanoporous quantum dot decreases. Our results for these optical parameters are in consistency with other research work&lt;br&gt; &amp;nbsp;3&lt;/p&gt;</dct:description>
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