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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Refractive index of ZnO ultrathin films alternated with Al(2)O(3)in multilayer heterostructures

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Author(s):
Lopez-Medina, J. [1] ; Carvalho, William O. F. [2] ; Vazquez-Arce, J. [3] ; Moncada-Villa, E. [4] ; Oliveira Jr, Osvaldo N. ; Farias, M. H. [5] ; Tiznado, H. [5] ; Mejia-Salazar, J. R. [2]
Total Authors: 8
Affiliation:
[1] UNAM, CONACYT Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada S-N BC, Ensenada 22800, Baja California - Mexico
[2] Natl Inst Telecommun Inatel, BR-37540000 Santa Rita Do Sapucai, MG - Brazil
[3] Ctr Invest Cient & Educ Super Ensenada CICESE, Ensenada 22860, Baja California - Mexico
[4] Univ Pedagog & Tecnol Colombia, Escuela Fis, Ave Cent Norte 39-115, Tunja - Colombia
[5] Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada S-N, Ensenada 22800, Baja California - Mexico
Total Affiliations: 5
Document type: Journal article
Source: Nanotechnology; v. 31, n. 50 DEC 11 2020.
Web of Science Citations: 0
Abstract

The design of optoelectronic devices made with ZnO superlattices requires the knowledge of the refractive index, which currently can be done only for films thicker than 30 nm. In this work, we present an effective medium approach to determine the refractive index of ZnO layers as thin as 2 nm. The approach was implemented by determining the refractive index of ZnO layers ranging from 2 nm to 20 nm using spectroscopic ellipsometry measurements in multilayers. For a precise control of morphology and thickness, the superlattices were fabricated with atomic layer deposition (ALD) with alternating layers of 2 nm thick Al(2)O(3)and ZnO, labeled as(N)ZnO-Al2O3, whereN = 10, 20, 30, 50, 75 and 100. The total thickness of all superlattices was kept at 100 nm. The approach was validated by applying it to similar superlattices reported in the literature and fitting the transmittance spectra of the superlattices. (AU)

FAPESP's process: 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis
Grantee:Osvaldo Novais de Oliveira Junior
Support Opportunities: Research Projects - Thematic Grants