<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">El-Bakkali, Abdelmajid</style></author><author><style face="normal" font="default" size="100%">Sadki, Siham</style></author><author><style face="normal" font="default" size="100%">Drissi, Lalla Btissam</style></author><author><style face="normal" font="default" size="100%">Djeffal, Faycal</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Layers engineering optoelectronic properties of 2D hexagonal GeS materials</style></title><secondary-title><style face="normal" font="default" size="100%">Physica E: Low-dimensional Systems and Nanostructures</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2021</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2021</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/abs/pii/S1386947721001740</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">133</style></volume><pages><style face="normal" font="default" size="100%">114791</style></pages><isbn><style face="normal" font="default" size="100%">1386-9477</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p style=&quot;text-align: justify;&quot;&gt;
	Using first-principles calculations, we study the structural, electronic and&amp;nbsp;&lt;a href=&quot;https://www.sciencedirect.com/topics/materials-science/optical-property&quot; title=&quot;Learn more about optical properties from ScienceDirect's AI-generated Topic Pages&quot;&gt;optical properties&lt;/a&gt;&amp;nbsp;of the monolayer, bilayer and trilayer&amp;nbsp;&lt;a href=&quot;https://www.sciencedirect.com/topics/materials-science/germanium&quot; title=&quot;Learn more about germanium from ScienceDirect's AI-generated Topic Pages&quot;&gt;germanium&lt;/a&gt;&amp;nbsp;&lt;a href=&quot;https://www.sciencedirect.com/topics/physics-and-astronomy/sulfide&quot; title=&quot;Learn more about monosulfide from ScienceDirect's AI-generated Topic Pages&quot;&gt;monosulfide&lt;/a&gt;&amp;nbsp;GeS. The results reveal an indirect semiconducting band gap for the monolayer and trilayer GeS, whereas the gap is direct for the bilayer GeS. Both the&amp;nbsp;&lt;a href=&quot;https://www.sciencedirect.com/topics/physics-and-astronomy/generalized-gradient-approximation&quot; title=&quot;Learn more about generalized gradient approximation from ScienceDirect's AI-generated Topic Pages&quot;&gt;generalized gradient approximation&lt;/a&gt;&amp;nbsp;and the screened hybrid functionals assess a decrease in&amp;nbsp;&lt;a href=&quot;https://www.sciencedirect.com/topics/physics-and-astronomy/energy-bands&quot; title=&quot;Learn more about band energy from ScienceDirect's AI-generated Topic Pages&quot;&gt;band energy&lt;/a&gt;&amp;nbsp;as the number of layers is improved. Furthermore, due to the high buckling of lattice structures, the&amp;nbsp;optical spectra&amp;nbsp;show significant degree of anisotropy. The number of layers engineers key optical parameters including the&amp;nbsp;refractive index, the&amp;nbsp;reflectivity&amp;nbsp;absorption and provides the layered GeS with excellent absorption in the low energy region, namely the visible and UV range of the&amp;nbsp;electromagnetic spectrum. Accordingly, 2D hexagonal GeS few-layers can be used as a highly promising material in the&amp;nbsp;optoelectronic, ultraviolet optical&amp;nbsp;nanodevices&amp;nbsp;and&amp;nbsp;photovoltaics.
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