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All Journal Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Journal of Technomaterial Physics
Rahayu, Siti Utari
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Agriculture, Biological Sciences & Forestry Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences

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Journal : Journal of Technomaterial Physics

 1 
Raman Spectroscopic Analysis of Cu-Ag-In-S/CdSe Core/Shell Quantum Dots Grown on Mesoporous TiO2 Substrates Rahayu, Siti Utari; Candra, Andy
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.19717

Abstract

This study investigates the structural and vibrational properties of Cu-Ag-In-S/CdSe core/shell quantum dots (QDs) grown on the mesoporous TiO2 (mp-TiO2) substrates using Raman spectroscopy and 3D Raman mapping.  The Raman spectra revealed distinct vibrational modes of AgInS2 and CdSe, compared to Cu-Ag-In-S, with a notable shift observed in the A1 mode (282.2 cm-1 to 260.8 cm-1), E and B2 modes (316.7 cm-1 to 326.4 cm-1), and an additional Cu-S mode (289.3 cm-1 to 283.4 cm-1). These shifts indicate significant interactions between the QDs and the substrate, as well as the presence of Cu and CdSe phases. 3D mapping provided spatial distribution data, showing enhanced Cu-incorporation and morphological variations across the substrates, with darker regions signifying Cu-enriched areas. The alterations in the Raman spectrum suggest a strong interaction between Cu-Ag-In-S and CdSe. The findings contribute to a deeper understanding of Cu-Ag-In-S/CdSe QDs, highlighting their potential to optoelectronic application.   
An In-depth Study of Relation Between Band Gap Energy and Lattice Constant for Cubic Phase LiSnX3 (X = F, Cl, Br, and I) Perosvkite Ong, Russell; Sagala, Junaina Sahputri; Rahayu, Siti Utari
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.19772

Abstract

Organic perovskites or inorganic perovskites are very popular among researchers who are designing the most efficient perovskite solar cells. Besides, they can be used as materials for other optoelectronic applications, such as light-emitting diodes. In this paper, we reported the results of studies on the electronic property of LiSnX3 (X = F, Cl, Br, or I) perovskite in the cubic phase. This electronic property is the density of states, which one can determine the band gap energy value. These studies were undertaken to understand the relation between their band gap energy and lattice constant through anion X variations. The Quantum ESPRESSO program calculated These two crucial quantities with norm-conserving Troullier-Martins pseudopotentials and Generalized Gradient Approximation Perdew-Burke-Enzerhof exchange-correlation functional. The computation results show that the band gap energy ranged from 0,3 eV to 0,99 eV while the lattice constant ranged from 6,183 Å to 4,625 Å for anion halide from I till F, respectively. The contrast trend between these quantities' values matches the Kronig-Penney Model.
Co-Authors Andy Candra Erwin Fitri, Fasihah Irfanii Marpaung, Tulus Joseph Herianto Marponghatun Nazriani, Dina Ong, Russell Sagala, Junaina Sahputri SUHARMAN Susilawati