title: ÐÐ¾Ð¼Ð±Ð¸Ð½Ð°ÑÐ¸Ð¾Ð½Ð½Ð¾Ðµ ÑÐ°ÑÑÐµÑÐ½Ð¸Ðµ ÑÐ²ÐµÑÐ° Ð¸ ÑÐ¾ÑÐ¾Ð»ÑÐ¼Ð¸Ð½ÐµÑÑÐµÐ½ÑÐ¸Ñ Ð² Ð°ÑÐ¾Ð¼Ð°ÑÐ½Ð¾ ÑÐ¾Ð½ÐºÐ¸Ñ ÑÐ»Ð¾ÑÑ In2Se3
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Raman spectroscopy and photoluminescence in atomically thin layers of In2Se3
Creators: name: ÐÑÐ¾ÑÐµÐ½ÐºÐ¾, ÐÑÐ¸Ð³Ð¾ÑÐ¸Ð¹
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: Ð´Ð²ÑÐ¼ÐµÑÐ½ÑÐµ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ñ
ÑÐ¿ÐµÐºÑÑÐ¾ÑÐºÐ¾Ð¿Ð¸Ñ ÐÐ Ð¡
ÑÐµÐ»ÐµÐ½Ð¸Ð´ Ð¸Ð½Ð´Ð¸Ñ
ÐºÐ¾Ð»ÐµÐ±Ð°ÑÐµÐ»ÑÐ½ÑÐµ Ð¼Ð¾Ð´Ñ
ÑÐ¾ÑÐ¾Ð»ÑÐ¼Ð¸Ð½ÐµÑÑÐµÐ½ÑÐ¸Ñ
two-dimensional materials
raman spectroscopy
indium selenide
vibrational modes
photoluminescence

description: ÐÐ±ÑÐµÐºÑ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ â ÑÐ¾Ð½ÐºÐ¸Ðµ (ÑÐ¾Ð»ÑÐ¸Ð½Ð° 7â80 ÑÐ»Ð¾ÐµÐ²) ÑÐµÑÑÐ¹ÐºÐ¸ 2H Î±In2Se3, Ð¿Ð¾Ð»ÑÑÐµÐ½Ð½ÑÐµ Ð¼ÐµÑÐ¾Ð´Ð¾Ð¼ Ð¼Ð¸ÐºÑÐ¾Ð¼ÐµÑÐ°Ð½Ð¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¾ÑÑÐ»Ð°Ð¸Ð²Ð°Ð½Ð¸Ñ. Ð¦ÐµÐ»Ñ ÑÐ°Ð±Ð¾ÑÑ â Ð½Ð°ÑÐ¾Ð¶Ð´ÐµÐ½Ð¸Ðµ Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ¸ Ð´Ð»Ñ Ð¾ÑÐµÐ½ÐºÐ¸ ÑÐ¾Ð»ÑÐ¸Ð½Ñ Î±-In2Se3 Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ ÑÐ¿ÐµÐºÑÑÐ¾ÑÐºÐ¾Ð¿Ð¸Ð¸ ÐÐ Ð¡, Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð¿ÑÐ¸ÑÐ¾Ð´Ñ Ð¤Ð Ð¾Ð±ÑÑÐ¼Ð½Ð¾Ð³Ð¾ Î±-In2Se3. ÐÐ¿Ð¸ÑÐ°Ð½Ñ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÑ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ ÐºÐ¾Ð»ÐµÐ±Ð°ÑÐµÐ»ÑÐ½ÑÑ ÑÐ²Ð¾Ð¹ÑÑÐ² ÑÐ»Ð¾Ð¸ÑÑÑÑ ÐºÑÐ¸ÑÑÐ°Ð»Ð»Ð¾Ð² Î±-In2Se3 Ð² Ð·Ð°Ð²Ð¸ÑÐ¸Ð¼Ð¾ÑÑÐ¸ Ð¾Ñ ÐºÐ¾Ð»Ð¸ÑÐµÑÑÐ²Ð° ÑÐ»Ð¾ÑÐ² ÐºÑÐ¸ÑÑÐ°Ð»Ð»Ð°. Ð¡Ð¾Ð²Ð¼ÐµÑÑÐ½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð· Ð´Ð°Ð½Ð½ÑÑ Ð°ÑÐ¾Ð¼Ð½Ð¾-ÑÐ¸Ð»Ð¾Ð²Ð¾Ð¹ Ð¼Ð¸ÐºÑÐ¾ÑÐºÐ¾Ð¿Ð¸Ð¸ Ð¸ ÑÐ¿ÐµÐºÑÑÐ¾ÑÐºÐ¾Ð¿Ð¸Ð¸ ÐºÐ¾Ð¼Ð±Ð¸Ð½Ð°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð³Ð¾ ÑÐ°ÑÑÐµÑÐ½Ð¸Ñ ÑÐ²ÐµÑÐ° (ÐÐ Ð¡) Ð²Ð¼ÐµÑÑÐµ Ñ ÑÐµÐ¾ÑÐµÑÐ¸ÐºÐ¾-Ð³ÑÑÐ¿Ð¿Ð¾Ð²ÑÐ¼ Ð°Ð½Ð°Ð»Ð¸Ð·Ð¾Ð¼ Ð¼Ð¾Ð´, Ð¾ÑÐ½Ð¾ÑÑÑÐ¸ÑÑÑ Ðº ÑÐ°Ð·Ð½ÑÐ¼ ÑÐ¸Ð¼Ð¼ÐµÑÑÐ¸ÑÐ¼ ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ð¹, Ð¿Ð¾Ð·Ð²Ð¾Ð»Ð¸Ð» ÑÑÑÐ°Ð½Ð¾Ð²Ð¸ÑÑ Ð·Ð°Ð²Ð¸ÑÐ¸Ð¼Ð¾ÑÑÐ¸ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÐ¾Ð² ÑÐ¿ÐµÐºÑÑÐ°Ð»ÑÐ½ÑÑ Ð»Ð¸Ð½Ð¸Ð¹ Ð² Ð¾Ð±Ð»Ð°ÑÑÑÑ ÑÐ²ÐµÑÑÐ½Ð¸Ð·ÐºÐ¸Ñ (10â50 ÑÐ¼^-1) Ð¸ Ð²ÑÑÐ¾ÐºÐ¸Ñ ÑÐ°ÑÑÐ¾Ñ (50â300 ÑÐ¼^-1). ÐÐ¿ÐµÑÐ²ÑÐµ ÑÑÑÐ°Ð½Ð¾Ð²Ð»ÐµÐ½Ð¾, ÑÑÐ¾ Ð´Ð»Ñ Ð¾ÑÐµÐ½ÐºÐ¸ ÑÐ¾Ð»ÑÐ¸Ð½Ñ Î±-In2Se3 Ð² Ð´Ð¸Ð°Ð¿Ð°Ð·Ð¾Ð½Ðµ Ð¾Ñ ÑÐµÐ¼Ð¸ Ð´Ð¾ Ð½ÐµÑÐºÐ¾Ð»ÑÐºÐ¸Ñ Ð´ÐµÑÑÑÐºÐ¾Ð² ÑÐ»Ð¾ÑÐ² Ð¼Ð¾Ð¶Ð½Ð¾ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°ÑÑ ÑÐ°ÑÑÐ¾ÑÑ Ð»Ð¸Ð½Ð¸Ð¸ Ð1(3) (Ï ~ 200 ÑÐ¼^-1) ÑÐ¿ÐµÐºÑÑÐ° ÐÐ Ð¡. ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð° ÑÐµÐ¼Ð¿ÐµÑÐ°ÑÑÑÐ½Ð°Ñ Ð·Ð°Ð²Ð¸ÑÐ¸Ð¼Ð¾ÑÑÑ ÑÐ¿ÐµÐºÑÑÐ¾Ð² ÑÐ¾ÑÐ¾Ð»ÑÐ¼Ð¸Ð½ÐµÑÑÐµÐ½ÑÐ¸Ð¸ (Ð¤Ð). ÐÑÐ¾Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ñ Ð·Ð°Ð²Ð¸ÑÐ¸Ð¼Ð¾ÑÑÐ¸ ÑÐ½ÐµÑÐ³Ð¸Ð¸ Ð¸ Ð¸Ð½ÑÐµÐ½ÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ Ð¿Ð¾Ð»Ð¾Ñ A Ð¸ B Ð¾Ñ ÑÐµÐ¼Ð¿ÐµÑÐ°ÑÑÑÑ. ÐÑÐµÐ½ÐµÐ½Ñ Ð·Ð½Ð°ÑÐµÐ½Ð¸Ñ ÑÐ½ÐµÑÐ³Ð¸Ð¸ Ð°ÐºÑÐ¸Ð²Ð°ÑÐ¸Ð¸ ÑÐµÐ¼Ð¿ÐµÑÐ°ÑÑÑÐ½Ð¾Ð³Ð¾ Ð³Ð°ÑÐµÐ½Ð¸Ñ Ð¤Ð. ÐÑÐ´Ð²Ð¸Ð½ÑÑÑ Ð¿ÑÐµÐ´Ð¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð¸Ñ Ð¾ ÑÐ²ÑÐ·Ð¸ Ð¿Ð¾Ð»Ð¾ÑÑ A c Ð¸Ð·Ð»ÑÑÐµÐ½Ð¸ÐµÐ¼ ÑÐ²Ð¾Ð±Ð¾Ð´Ð½ÑÑ ÑÐºÑÐ¸ÑÐ¾Ð½Ð¾Ð², Ð° Ð¿Ð¾Ð»Ð¾ÑÑ B â c Ð¸Ð·Ð»ÑÑÐ°ÑÐµÐ»ÑÐ½Ð¾Ð¹ ÑÐµÐºÐ¾Ð¼Ð±Ð¸Ð½Ð°ÑÐ¸ÐµÐ¹ Ð½Ð° ÑÐ¾Ð±ÑÑÐ²ÐµÐ½Ð½ÑÑ ÐºÐ°ÑÐ¸Ð¾Ð½Ð½ÑÑ Ð²Ð°ÐºÐ°Ð½ÑÐ¸ÑÑ.
description: The object of study is thin (thickess from 7 to 80 layers) 2H Î±-In2Se3 flakes obtained by micromechanical exfoliation. The purpose of the work is to find a technique for estimating the thickness of Î±-In2Se3 using Raman spectroscopy, and to study the nature of PL of bulk Î±-In2Se3. The results of a study of the vibrational properties of layered Î±-In2Se3 crystals depending on the number of crystal layers are described. A joint analysis of atomic force microscopy and Raman spectroscopy data, together with group theoretical analysis of modes related to different symmetries of vibrations, helped to establish the dependence of the spectral lines parameters in the ultra-lowÂ  (10â50 cm^-1) and high frequencies (50â300 cm^-1) spectral regions on the number of layers. For the first time, it was established that the A1(3) line (Ï ~ 200 cm^-1) can be used to estimate the thickness of Î±-In2Se3 in the range from seven to several tens of monolayers. The temperature dependence of the photoluminescence spectra was studied. The dependences of the energy and intensity of bands A and B on temperature are analyzed. The activation energies for thermal quenching of PL were estimated. Assumptions have been made about the connection of band A with the emission of free excitons, and band B with radiative recombination at intrinsic cation vacancies.