Work number - M 6 AWARDED
Presented V.I. Vernadsky Institute of General and Inorganic Chemistry. National Academy of Sciences of Ukraine
Ph.D. Plutenko T.O., Ph.D. Torchyniuk P.V.
Organic-inorganic perovskites based on CH3NH3РbІ3, which are promising for use in solar energy conversion systems, and ceramic materials with high dielectric constant based on Ba(1-x)(M0.5Bi0.5)xTiO3 (M = Li, Na, K), CaCu3Ti4O12, (La,Li,Na)(Ti,Al)O3 solid solutions for energy storage systems were synthesized in this work.
Peculiarities of CH3NH3РbІ3 perovskite formation depending on the ratio of PbI2:CH3NH3I in solvents of dimethylformamide (DMF) and dimethylsulfoxide (DMSO) were studied. It was found that the use of DMSO promotes the formation of denser and more stable to moisture and radiation perovskite films. CH3NH3PbI3 perovskite films have a long diffusion length of minority charge carriers compared to the film thickness, which can greatly simplify the technology obtaining of solar cells. The stability of CH3NH3PbI3 films to the action of moisture is increased more than 20 times due to the use of cycloolefin copolymer, polyvinylidene chloride, polyvinyl butyral.
Materials based on (1-x)BaTiO3 – xM0.5Bi0.5TiO3 (M = Na, K) (at 0,1 ≤ x ≤ 0.2), in which the dielectric constant is greater than 104 were obtained. It was established that the change in dielectric permeability in these materials does not exceed 15% in a wide temperature range up to 270 °C. It was shown that ceramics based on calcium-copper titanate, synthesized by a new carbonate coprecipitation method of synthesis, is characterized by high dielectric characteristics (e ≥ 104, tg δ = 0.15 at a frequency of 1 kHz). It was found that the best dielectric characteristics among lithium-containing materials have solid solutions of La0.5Li0.4Na0.1TiO3 (e = 24000 – 7000, tg δ ≈ 0.25) and La0,67Li0,15Ti0,85Al0,15O3 (e = 568000 – 23000, tg δ ≈ 0.45) in the wide frequency range 1 Hz - 10 kHz.
Number of publications: 1 chapter of the monograph, 23 articles (14 - in English-language journals with impact factor), 31 abstracts. The total number of references to the authors' publications / h-index of the work, according to the databases is respectively: Web of Science - 23/3, Scopus - 27/3, Google Scholar - 45/5. 3 Ukrainian patents of utility model were obtained.