Study of lead free ferroelectric films for new solar cells

D. Fasquelle, M. Mascot, J. C. Carru, M. Hikam, Y. Iriani, Bambang Soegijono

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

We report on the deposition by a sol-gel process of Ba0.8Sr 0.2TiO3 and Ba0.9Sr0.1TiO 3 films on platinum coated silicon substrates. X-Ray diffraction patterns show that the films are (111) preferentially oriented. The surface morphology is smooth, without cracks and the grain size is about 50 nm as determined by AFM and SEM. The dielectric constant measured from 102 to 106 Hz decreases slightly and is around 400 at 104 Hz. The losses are constant in a first approximation for a 1.5μm thick BST(80/20) film with a value of 0.03 at 10 kHz. The existence of an hysteresis cycle attests that the films, whatever their thickness, are in a ferroelectric state. Pyroelectric coefficients have been determined and the best figure of merit obtained on BST(90/10) at 293K and 10 kHz is of 149 μC/m3/K. The best dielectric and pyroelectric properties (tgδ = 0.006 at 1MHz, tunability = 30%, γ = 340 μC/m2/K) were obtained on the 400 nm BST(90/10) film. Work is in progress to characterize the piezoelectric and photovoltaic properties of our BST films.

Original languageEnglish
Title of host publicationInternational Workshop on Advanced Material for New and Renewable Energy, AMNRE
Pages55-62
Number of pages8
DOIs
Publication statusPublished - 30 Nov 2009
EventInternational Workshop on Advanced Material for New and Renewable Energy, AMNRE - Jakarta, Indonesia
Duration: 9 Jun 200911 Jun 2009

Publication series

NameAIP Conference Proceedings
Volume1169
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Workshop on Advanced Material for New and Renewable Energy, AMNRE
Country/TerritoryIndonesia
CityJakarta
Period9/06/0911/06/09

Keywords

  • BST
  • Dielectric constant
  • Ferroelectric state
  • Losses
  • Pyroelectric coefficient
  • Silicon substrate
  • Sol-gel
  • Solar cell
  • Thin film

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