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Title: Thermal-to-electric energy conversion using ferroelectric film capacitors

The capacitive ferroelectric thermoelectric converter harvesting electrical energy through non-linear capacitance variation caused by changes in temperature is analyzed. The ferroelectric material used was the thin (0.5 μm) Ba{sub 0.3}Sr{sub 0.7}TiO{sub 3} film. On the basis of experimental dependencies of the ferroelectric film permittivity on temperature ranging from 100 K to 350 K under different electric fields up to 80 V/μm, the optimum values of operating temperatures and electric field for the energy harvesting optimization were determined. For the temperature oscillations of ±15 K around room temperature and electric field about 40 V/μm, the harvested energy was estimated as 30 mJ/cm{sup 3}. It is shown that the use of thin ferroelectric films for rapid capacitance variation versus temperature and microelectromechanical systems for fast temperature modulations may be a relevant solution for creation of small power scale generators for portable electronics.
Authors:
; ;  [1]
  1. Saint-Petersburg State Electrotechnical University, 5 Professor Popov Street, St-Petersburg 197376 (Russian Federation)
Publication Date:
OSTI Identifier:
22308178
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BARIUM COMPOUNDS; CAPACITORS; ELECTRIC FIELDS; ENERGY CONVERSION; FERROELECTRIC MATERIALS; FILMS; MODULATION; OPTIMIZATION; OSCILLATIONS; PERMITTIVITY; STRONTIUM COMPOUNDS; TEMPERATURE RANGE 0273-0400 K; THERMOELECTRIC GENERATORS; TITANATES