Absorption spectra peculiarities of thin films of (CsCu₂Cl₃)₁₋ₓ(CsCu₂l₃)ₓ system.

• Дата: 2004
• Автори: Yunakova, O.N., Miloslavsky, V.K., Kovalenko, E.N.
• Формат: Стаття
• Мова: English
• Опубліковано: НТК «Інститут монокристалів» НАН України 2004
• Назва видання: Functional Materials
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/139972
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Absorption spectra peculiarities of thin films of (CsCu₂Cl₃)₁₋ₓ(CsCu₂l₃)ₓ system / O.N. Yunakova, V.K. Miloslavsky, E.N. Kovalenko // Functional Materials. — 2004. — Т. 11, № 4. — С. 761-765. — Бібліогр.: 9 назв. — англ.

Absorption spectrum of (CsCu₂Cl₃)₁₋ₓ(CsCu₂l₃)x thin films has been investigated in the fundamental band region. The CsCu₂Cl₃ solid solutions have been found to be formed within the concentration ranges 0<x<0.08 and 0.34<x<1. In the 0.1<x<0.6 range, there is a mixture of two phases in the thin films, namely, of CsCu₂Cl₃-₃xI₃x solid solutions and CsCu₂Cl₃:Cu⁺. The latter phase appears as a result of a strong disordering of the CsCu₂Cl₃ anionic sublattice as Cl⁻ ions are substituted by l- ones having a larger radius. A new absorption band corresponds to that phase in the absorption spectrum peaked at 4.8 eV; it is associated with the excitation of quasi-impurity Cu⁺ ions in the cationic sublattice of the compound in the vicinity of l- ions. The concentration dependences of the exciton band position Eex(x) and half-width GA A A MA(x) are typical of solid solutions and confirm the formation thereof in the mentioned concentration ranges.