Growth and characterization of PbSe microcrystals via the pulsed laser welding technique
Yükleniyor...
Dosyalar
Tarih
2022
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
SPRINGER HEIDELBERG
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Herein lead selenide crystals are fabricated by the pulsed laser welding (PLW) technique within 2 min. The effect of the pulse width on the crystallinity, surface morphology, structural parameters, compositional stoichiometry, electric resistivity and dielectric constant is considered. It is observed that the PLW technique allowed the growth of the crystals in a short period of time. The grown PbSe crystals are mostly cubic containing tetragonal SeO2 as a minor phase. Selenium oxide presented due to the surface oxidation of PbSe after exposing the crystals to air. Remarkable decreases in the electrical resistivity and increase in the dielectric constant by more than two orders of magnitude are achieved as the pulse width increases from 10 to 50 ms. It is observed that the optimum pulse width revealing the highest dielectric constant value is 30 ms. For these samples, a negative capacitance effect is observed for ac signals of frequencies larger than 700 MHz. In addition, analyzing the microwave cut-off frequency spectra for an imposed signal of low amplitude displayed cut-off frequency values larger than 100 GHz at the point where negative capacitance dominates and ac conductance shows a maxima. The features of the PbSe crystals which are prepared in 2 min nominate them for use as negative capacitance sources and band filters suitable for 6G technologies.
Açıklama
Anahtar Kelimeler
PbSe, Pulsed laser welding, Negative capacitance, Microwave, 6G technology
Kaynak
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
128
Sayı
12
Künye
Alkhamisi, M. M., Khanfar, H. K., Qasrawi, A. F., & Algarni, S. E. (2022). Growth and characterization of PbSe microcrystals via the pulsed laser welding technique. Applied Physics A, 128(12), 1-10.
