Large electrocaloric effect with high thermal and electric field cycling stability in solution-processed Y:HfO2 thin films

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 33
  • Download : 0
The electrocaloric effect (ECE) - the zero-emission energy-efficient process in which an applied electric field can reversibly change the entropy in a polar material, is promising for environment-friendly and compact applications like microelectronic cooling and solid-state refrigeration. For such applications, the ECE material must endure numerous thermal and electric field cycles, and long-term thermal and electric field cycling stability of the ECE material should be investigated in detail. We investigated the performance and reliability of the ECE of solution-processed Y:HfO2 thin films in terms of isothermal entropy change, adiabatic temperature change, isothermal heat and refrigerant capacity under both thermal and electric field cycling. The ECE responses are investigated under thermal (303-423 K) and electric field (10(6)) cycling processes. A large positive ECE response (temperature change, Delta T-max) of up to 24.8 K (with an ECE strength of 0.7 K cm MV-1) was achieved, originating from high polarization and sharp variation in polarization through the phase transition in Y:HfO2. The isothermal heat (Q) and refrigerant capacity (RC) were 7755 J kg(-1) and 822 J kg(-1), respectively. The Y:HfO2 thin films exhibited robust thermal cycling stability with negligible Delta T-max, Q, and RC variations after 40 thermal cycling processes. After 10(6) electric field cycles, Delta T-max, Q, and RC were 19.4 K, 6060 J kg(-1) and 595 J kg(-1), respectively. The large and reliable ECE in environment-friendly lead-free Y:HfO2 thin films deposited directly on a Si-substrate using a facile solution process outperformed the other HfO2-based and Pb-free ECE materials and will find applications in on-chip microelectronic cooling devices.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2022-05
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.10, no.18, pp.9960 - 9970

ISSN
2050-7488
DOI
10.1039/d1ta10229j
URI
http://hdl.handle.net/10203/296509
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0