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SUMMARY:Optical properties of atomically thin semiconductors: The role of 
 excitons
DTSTART;VALUE=DATE-TIME:20200926T132000Z
DTEND;VALUE=DATE-TIME:20200926T134000Z
DTSTAMP;VALUE=DATE-TIME:20260412T141548Z
UID:indico-contribution-255@indico.uni.edu.pe
DESCRIPTION:Speakers: Cesar E. P. Villegas (Universidad Privada del Norte 
 (UPN))\nTwo-dimensional (2D) atom-thick crystals such as graphene\, boron-
 nitrade (BN)\, transition metal dichalcogenides (TMDC)  and most recently 
 phosphorus allotropes have drawn both experimental and theoretical interes
 t due to their unique electronic and optical properties.  For instance\, T
 MDCs possess remarkable properties concerning the tunability of band gap a
 nd strong light-matter coupling that are desirable features for optoelectr
 onic applications. Likewise\,  the phosphorus allotropes (black and blue p
 hosphorus) possess layered-tunable band-gap properties and a peculiar anis
 otropic crystalline structure\, which are important features that can  be 
 used in photonics and photovoltaics technologies. \nMotivated by this rece
 nt findings and considering the individual properties of the materials men
 tioned above\, we carry out density functional theory (DFT) calculations c
 ombining with the GW-Bethe-Salpeter (GW-BSE) methodology to study the exci
 tonic\, optical properties and the power conversion efficiency of  MoTe$_{
 2}$/InN heterostructures.  First\, we study the geometric and electronic s
 tructure of six heterostructures based on different stacking.  We  also ex
 plore the effects of the tensile strain on engineering the bandgap of the 
 individual monolayers. Secondly\, we use the GW-BSE methodology  to study 
 the optical spectrum and estimate the power conversion efficiency of the d
 evice. Our results indicates that the optical band gap of the heterostruct
 ures are in the range of  1.12 to 1.17 eV [1]. For the sake of completenes
 s\, the excitonic properties of black/blue phosphorus as a function of the
  light-polarization are also explored [2]. We hope this work will shed som
 e light in the seeking of designing more efficient photovoltaics devices b
 ased on those materials.  \nKeywords: Black phosphorus\, blue phosphorus\,
  optical properties\, excitons\, MoTe$_2$\n\nReferences\n[1] C.E.P. Villeg
 as et. al The Journal of Physical Chemistry C 119\, 11886 (2015).\n[2] C.E
 .P. Villegas et. al Physical Chemistry Chemical Physics 18\, 27829 (2016).
 \n\nhttps://indico.uni.edu.pe/event/85/contributions/255/
LOCATION:Lima\, Perú
URL:https://indico.uni.edu.pe/event/85/contributions/255/
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