Optical and grain boundary potential characteristics of sulfurized BiFeO3 thin films for photovoltaic applications

Seung Min Lee, Yong Soo Cho

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Sulfurized BiFeO3 (BFO) thin films have been investigated with the purpose of reducing their band gap for photovoltaic applications. A strong dependence of the degree of sulfurization on the structure and optical properties of the BFO thin films was observed. The sulfurization process substantially reduced the optical band gap from 2.83 eV for the reference sample to ∼1.90 eV in a sample sulfurized at 200 °C, a temperature at which the BFO phase was still dominant. The existence of the secondary Bi2S3 phase was found to be initiated from the film surface and became dominant at higher temperatures. XPS analysis suggests potential Bi-Fe(iii)-Fe(ii)-S-O compounds as a result of the change of the oxidation state of Fe with the progress of sulfurization. The sulfurized BFO film exhibited relatively higher positively charged grain boundaries than the reference film, suggesting its improved applicability in photovoltaic devices.

Original languageEnglish
Pages (from-to)5598-5603
Number of pages6
JournalDalton Transactions
Volume45
Issue number13
DOIs
Publication statusPublished - 2016 Jan 1

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Grain boundaries
Thin films
Optical band gaps
Energy gap
X ray photoelectron spectroscopy
Optical properties
Oxidation
Temperature

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

Cite this

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abstract = "Sulfurized BiFeO3 (BFO) thin films have been investigated with the purpose of reducing their band gap for photovoltaic applications. A strong dependence of the degree of sulfurization on the structure and optical properties of the BFO thin films was observed. The sulfurization process substantially reduced the optical band gap from 2.83 eV for the reference sample to ∼1.90 eV in a sample sulfurized at 200 °C, a temperature at which the BFO phase was still dominant. The existence of the secondary Bi2S3 phase was found to be initiated from the film surface and became dominant at higher temperatures. XPS analysis suggests potential Bi-Fe(iii)-Fe(ii)-S-O compounds as a result of the change of the oxidation state of Fe with the progress of sulfurization. The sulfurized BFO film exhibited relatively higher positively charged grain boundaries than the reference film, suggesting its improved applicability in photovoltaic devices.",
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Optical and grain boundary potential characteristics of sulfurized BiFeO3 thin films for photovoltaic applications. / Lee, Seung Min; Cho, Yong Soo.

In: Dalton Transactions, Vol. 45, No. 13, 01.01.2016, p. 5598-5603.

Research output: Contribution to journalArticle

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