Temperature-Dependent Raman Scattering of ZnSe Nanowires

Abstract

We present a Raman scattering study of ZnSe over a temperature range from 80 to 580 K. Both of TO and LO modes of ZnSe nanowires are observed a red-shift with elevating temperature, and its intrinsic broadening is larger than that of bulk counterpart. The opticalphonon lifetime of ZnSe nanowires are longer than that of nanoparticles but shorter than that of bulk, which can be attributed to the different surface to volume ratios. Some overtones and multi-phonon peaks are also observed at high temperature due to the larger wave vector q. The 2TA 1 (K) and multi-phonon peaks TA(X,K) + LA(X) appears at the temperature that is higher than room temperature. The intensity of overtones acoustics TA(L) elevates with increasing temperature while the surface mode disappears at temperature higher than 296 K. Detailed investigations on temperature-dependent phonon characteristics provide essential component for understanding confined phonons effects at small scale.

Carrier transport and surface potential over phase variations in the surface and bulk of highly efficient Cu2ZnSn(S,Se)4 solar cells

“…MoSe 2 (288 and 350 cm −1 ), ZnSe (252 cm −1 ), and CZTSe (240 cm −1 ) appeared at point 2 (P2), which is near the Mo back-contact layer. 46 The tin oxide phase peak at 172 and 583 cm −1 was particularly strong at P2 and P3 (ie, near the interfaces). 47 The peak for tin oxides at the wavenumber of 172 cm −1 can overlap with that of CZTSe.…”

“…The CZTSe phase (172, 196, and 240 cm −1 ) and CZTS peak (329 and 383 cm −1 ) were observed at each point. MoSe 2 (288 and 350 cm −1 ), ZnSe (252 cm −1 ), and CZTSe (240 cm −1 ) appeared at point 2 (P2), which is near the Mo back‐contact layer . The tin oxide phase peak at 172 and 583 cm −1 was particularly strong at P2 and P3 (ie, near the interfaces) .…”

Structural, Optical, and Photocatalytic Properties of ZnSe Nanoparticles Influenced by the Milling Time

“…According to Refs. [23][24][25], the modes at 138, 201, and 247 cm −1 are assigned to 2TA, TO, and LO, respectively, while the mode at 492 cm −1 is associated with the LO phonon replica (2LO). They are considered as the characteristic modes of the zincblende-type ZnSe structure.…”

Temperature-Dependent Raman Scattering of Large Size Hexagonal Bi2Se3 Single-Crystal Nanoplates

“…Furthermore, it is well known that change of temperature can vary inter-atomic distances and vary the overlap among adjacent electronic orbitals. Therefore, temperature-dependent Raman spectra are well suitable to obtain information on the thermal conductivity of materials, as well as isotopic effects and phonon lifetimes [17][18][19].…”

“…Bi 2 Se 3 has an extensive application as thermoelectric and photoelectric materials near the room temperature [24,25]. Raman spectroscopy was an important tool to characterize the physical properties of various nanostructures, such as: 1T-TaS 2 [26], TiS 3 [27], MoS 2 [28], CoFe 2 O 4 [29], CuGaO 2 [30], Bi 3.25 La 0.75 Ti 3 O 12 [31], ZnSe [18,32], ZnO [33], etc. Recently, there are some reports about the Raman-active optical phonon of Bi 2 Se 3 micro/nanostructures [34][35][36].…”