Band offsets, optical conduction, photoelectric and dielectric dispersion in InSe/Sb2 Te3 heterojunctions
Yükleniyor...
Dosyalar
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
SciELO
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
InSe based heterojunction devices gain importance in optoelectronic applications in NIR range as multipurpose sensors. For this reason, InSe/Sb2 Te3 heterojunctions are constructed as NIR sensors by the thermal evaporation technique. The structural, optical, dielectric and photoelectric properties of InSe/Sb2 Te3 heterojunctions are explored by X-ray diffraction and ultraviolet-visible light spectrophotometry techniques. The structural analyses revealed the preferred growth of polycrystalline hexagonal Sb2 Te3 onto amorphous InSe as a major phase. Optically, the coating of Sb2 Te3 onto InSe enhanced the light absorbability of InSe by more than 18 times, redshifts the energy band gap, increased the dielectric constant by ~5 times and increased the optical conductivity by 35 times in the NIR range of light. A conduction and valance band offsets of 0.40 and 0.68 eV are determined for the InSe/Sb2 Te3 heterojunction devices. In addition, the Drude-Lorentz fittings of the optical conductivity indicated a remarkable increase in the plasmon frequency values upon depositing of Sb2 Te3 onto InSe. The illumination intensity and time dependent photocurrent measurements resulted in an enhancement in the photocurrent values by one order of magnitude. The response time of the devices is sufficiently short to nominate the InSe/Sb2 Te3 heterojunction devices as fast responding NIR sensors suitable for optoelectronic applications.
Açıklama
Anahtar Kelimeler
InSe/Sb2 Te3, Dielectric, Band Offset, Drude-Lorentz Model
Kaynak
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
WoS Q Değeri
Q4
Scopus Q Değeri
N/A
Cilt
24
Sayı
Künye
Alfhaid, Latifah Hamad Khalid, Qasrawi, A. F. and AlGarni, Sabah E.Band Offsets, Optical Conduction, Photoelectric and Dielectric Dispersion in InSe/Sb2Te3 Heterojunctions. Materials Research [online]. 2021, v. 24, n. 4 [Accessed 27 May 2021] , e20200578. Available from: <https://doi.org/10.1590/1980-5373-MR-2020-0578>. Epub 19 May 2021. ISSN 1980-5373. https://doi.org/10.1590/1980-5373-MR-2020-0578.
