Structure and Properties of ZnSxSe1-x Thin Films Deposited by Thermal Evaporation of ZnS and ZnSe Powder Mixtures
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Materials Research Express
, E-ISSN: 2053-1591
|
| Вых. Данные |
Год: 2015,
Том: 2,
Номер: 2,
Страницы: 025006
Страниц
: 9
DOI:
10.1088/2053-1591/2/2/025006
|
| Ключевые слова |
Band gap; EXAFS spectroscopy; Raman spectroscopy; Thermal evaporation of ZnS and ZnSe powders mixture; Thin films of ZnSxSe1-x compounds; X-ray diffraction |
| Авторы |
Valeev R G
1
,
Romanov E A
2
,
Vorobiev V L
1
,
Mukhgalin V V
1
,
Kriventsov V V
3
,
Chukavin A I
1
,
Robouch B.
4
|
| Организации |
| 1 |
Physical-Technical Institute of Ural Brunch of RAS, Kirova str. 132, Izhevsk 426000, Russia
|
| 2 |
Udmurt State University, Universitetskaya str. 1, Izhevsk 426034, Russia
|
| 3 |
Boreskov’s Institute of Catalysis of Siberian Brunch of RAS, Lavrentieva 5, Novosibirsk 630090, Russia
|
| 4 |
Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati, Italy
|
|
Информация о финансировании (4)
|
1
|
Российский фонд фундаментальных исследований
|
12-03-01039 (01201258422)
|
|
2
|
Президиум РАН
|
24
|
|
3
|
Уральское отделение Российской академии наук
|
12-П-2-1038
|
|
4
|
Уральское отделение Российской академии наук
|
12-С-2-1024
|
Interest to ZnS x Se 1−x alloys is due to their band-gap tunability varying S and Se content. Films of ZnS x Se 1−x were grown evaporating ZnS and ZnSe powder mixtures onto SiO 2 , NaCl, Si and ITO sub-strates using an original low-cost method. X-ray diffraction patterns and Raman spectroscopy, show that the lattice structure of these films is cubic ZnSe-like, as S atoms replace Se and film compositions have their initial S/Se ratio. Optical absorption spectra show that band gap values increase from 2.25 to 3 eV as x increases, in agreement with the literature. Because S atomic radii are smaller than Se, EXAFS spectra confirm that bond distances and Se coordination numbers decrease as the Se content decrea-ses. The strong deviation from linearity of ZnSe coordination numbers in the ZnS x Se 1−x indicate that within this ordered crystal structure strong site occupation preferences occur in the distribution of Se and S ions. The behavior is quantitatively confirmed by the strong deviation from the random Ber-noulli distribution of the three sight occupation preference coefficients of the strained tetrahedron model. Actually, the ternary ZnS x Se 1−x system is a bi-binary (ZnS+ZnSe) alloy with evanescent forma-tion of ternary configurations throughout the x-range