In situ monitoring of crystallinity of FeSe2 thin films during thermal annealing and the annealing effects on the structural, optical and dielectric properties
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Wiley
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Herein stacked layers of iron selenide (FeSe2) thin films are deposited by the physical evaporation technique and thermally annealed. An in situ monitoring of the crystallinity during the annealing process has shown that the crystallinity is reached at 100 degrees C. The crystallinity of the films that preferred the orthorhombic phase is enhanced with increasing annealing temperature. Evidences about the improved crystallinity are presented by the increased crystallite and grain sizes, decreased microstrain values, decreased stacking faults, and decreased defect densities with increasing annealing temperature. Optical investigations have shown impressive effect of the annealing process on the optical reflectance, optical contrast, and light absorbability. Namely, respective improvement percentages exceeding 170%, 64%, and 140% is achieved near E approximate to 2 eV for samples annealed at 200 degrees C for 20 min. Both direct and indirect optical transitions are dominant in the film. In addition the annealing increased the dielectric constant in the spectral range of 1.17-4.20 eV. Maximum dielectric enhancement by 214% is reached near approximate to 2.10 eV. Moreover, the annealing process increases the optical conductivity and drift mobility of the FeSe2 films. The improvement in the crystallinity that resulted in enhanced optical properties makes the thermally annealed FeSe2 films promising for optoelectronic technology applications.
Açıklama
Anahtar Kelimeler
Dielectric, Enhanced Optical Conduction, FeSe2, Orthorhombic, Thermal Annealing
Kaynak
Crystal research and technology
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
Cilt
59
Sayı
8
Künye
Qasrawi, A., Gaabour, L. H., & Alharbi, S. (2024). In Situ Monitoring of Crystallinity of FeSe2 Thin Films During Thermal Annealing and the Annealing Effects on the Structural, Optical and Dielectric Properties.
