Role of Ba in engineering band gap, photoluminescence and nonlinear optical properties of SnO2 nanostructures for photovoltaic and photocatalytic applications

M. S. Bannur, Albin Antony, K. I. Maddani, P. Poornesh, K. B. Manjunatha, Suresh D. Kulkarni, K. S. Choudhari

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

In this article, we present the role of Ba doping in tuning energy gap, photoluminescence (PL) and third-order optical nonlinearity χ(3) of SnO2 nanostructures. Surface morphology analysis indicates the fragmentation of larger grains upon Ba incorporation possibly caused by the lattice mismatch effects. X-ray diffraction reveals polycrystalline nature of the nanostructures with rutile tetragonal structure. A shift in preferential growth orientation plane (200, 211, 110) has been observed with increase in Ba concentration. PL spectroscopy studies confirms the crystallinity of the films ruling out the presence of Sn interstitials. The green luminescent center at 550 nm and trap emission at 578 nm are attributed to singly ionized charge state of the oxygen and defect levels in band gap. Relatively large change in the band gap (3.64 eV −3.13 eV) arises due to Ba doping points the credibility of SnO2 thin films for use in photovoltaic and photocatalytic applications. Third-optical nonlinearity of the films investigated by Z-scan technique shows χ(3) as high as 3.37 × 10−3 esu indicating the suitability of SnO2 nanostructures in nonlinear optical (NLO) devices such as optical power limiters and switches.

Original languageEnglish
Pages (from-to)156-164
Number of pages9
JournalSuperlattices and Microstructures
Volume122
DOIs
Publication statusPublished - 01-10-2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Role of Ba in engineering band gap, photoluminescence and nonlinear optical properties of SnO<sub>2</sub> nanostructures for photovoltaic and photocatalytic applications'. Together they form a unique fingerprint.

Cite this