This study investigates the combined effects of nanoscale surface roughness and electron–phonon interaction on the vibrational modes of cadmium telluride (CdTe) using resonant Raman spectroscopy. Raman spectra simulations aided in identifying the active phonon modes and their dependence on roughness. Our results reveal that increasing surface roughness leads to an asymmetric line shape in the first-order longitudinal optical (1LO) phonon mode, attributed to an increase in the electron–phonon interaction. This asymmetry broadens the entire Raman spectrum. Conversely, the overtone (second-order longitudinal optical, or 2LO. mode exhibits a symmetrical line shape that intensifies with roughness. Additionally, we identify and discuss the contributions of surface optical phonon mode and multiphonon modes to the Raman spectra, highlighting their dependence on roughness. This work offers a deeper understanding of how surface roughness and electron–phonon scattering influence the line shape of CdTe resonant Raman spectra, providing valuable insights into its vibrational properties.
SedlačkováK.ZaťkoB.ŠagátováA.NečasV.. “Polarization Effect of Schottky-Barrier CdTe Semiconductor Detectors After Electron Irradiation”. Nucl. Instrum. Methods Phys. Res., Sect. A. 2022. 1027: 166282. https://doi.org/10.1016/j.nima.2021.166282
2.
GnatyukV.MaslyanchukO.SolovanM.BrusV.AokiT.. “CdTe X/Γ-ray Detectors with Different Contact Materials”. Sensors. 2021. 21(10): 3518. https://doi.org/10.3390/S21103518
3.
BosioA.PasiniS.RomeoN.. “The History of Photovoltaics with Emphasis on CdTe Solar Cells and Modules”. Coatings. 2020. 10(4): 344. https://doi.org/10.3390/coatings10040344
4.
MoonM.M.A.RahmanM.F.KamruzzamanM.HossainJ.IsmailA.B.. “Unveiling the Prospect of a Novel Chemical Route for Synthesizing Solution-Processed Cds/CdTe Thin-Film Solar Cells”. Energy Reports. 2021. 7: 1742–1756. https://doi.org/10.1016/j.egyr.2021.03.031
5.
RahmanK.S.HarifM.N.RoslyH.N.KamaruzzamanM.I.B., et al. “Influence of Deposition Time in CdTe Thin Film Properties Grown by Close-Spaced Sublimation (CSS) for Photovoltaic Application”. Results Phys. 2019. 14: 102371. https://doi.org/10.1016/j.rinp.2019.102371
6.
SutharD.ChuhadiyaS.SharmaR.HimanshuS. DhakaM.S.. “An Overview on the Role of ZnTe as an Efficient Interface in CdTe Thin Film Solar Cells: A Review”. Mater. Adv. 2022. 3(22): 8081–8107. https://doi.org/10.1039/D2MA00817C
7.
Campos-GonzálezE.De Moure-FloresF.Ramírez-VelázquezL.E.Casallas-MorenoK., et al. “Structural and Optical Properties of CdTe-Nanocrystals Thin Films Grown by Chemical Synthesis”. Mater. Sci. Semicond. Process. 2015. 35: 144–148. https://doi.org/10.1016/j.mssp.2015.03.005
8.
GunjalS.D.KhollamY.B.JadkarS.R.ShripathiT., et al. “Spray Pyrolysis Deposition of P-CdTe Films: Structural”. Optical and Electrical Properties”. Sol. Energy. 2014. 106: 56–62. https://doi.org/10.1016/j.solener.2013.11.029
9.
AblekimT.DuenowJ.N.ZhengX.MoutinhoH., et al. “Thin-Film Solar Cells with 19% Efficiency by Thermal Evaporation of CdSe and CdTe”. ACS Energy Lett. 2020. 5(3): 892–896. https://doi.org/10.1021/acsenergylett.9b02836
10.
MathewX.MathewsN.R.SebastianP.J.FloresC.O.. “Deep Levels in the Band Gap of CdTe Films Electrodeposited from an Acidic Bath: PICTS Analysis”. Sol. Energy mater. Sol. Cells. 2004. 81(3): 397–405. https://doi.org/10.1016/j.solmat.2003.11.015
11.
LugoJ.M.RosendoE.Romano-TrujilloR.OlivaA.I., et al. “Effects of the Applied Power on the Properties of RF-Sputtered CdTe Films”. Mater. Res. Express. 2019. 6(7): 076428. https://doi.org/10.1088/2053-1591/ab17c0
12.
TangK.ZhuX.BaiW.ZhuL., et al. “Molecular Beam Epitaxial Growth and Optical Properties of the CdTe Thin Films on Highly Mismatched SrTiO3 Substrates”. J. Alloys Compd. 2016. 685: 370–375. https://doi.org/10.1016/j.jallcom.2016.05.214
13.
RazykovT.M.FerekidesC.S.MorelD.StefanakosE., et al. “Solar Photovoltaic Electricity: Current Status and Future Prospects”. Sol. Energy. 2011. 85(8): 1580–1608. https://doi.org/10.1016/j.solener.2010.12.002
14.
KrčJ.ZemanM.KluthO.SmoleF.TopičM.. “Effect of Surface Roughness of ZnO: Al Films on Light Scattering in Hydrogenated Amorphous Silicon Solar Cells”. Thin Solid Films. 2003. 426(1–2): 296–304. https://doi.org/10.1016/S0040-6090(03)00006-3
15.
VyasP.B.Van De PutM.L.FischettiM.V.. “Master-Equation Study of Quantum Transport in Realistic Semiconductor Devices Including Electron–Phonon and Surface-Roughness Scattering”. Phys. Rev. Appl. 2020. 13(1): 014067. https://doi.org/10.1103/physrevapplied.13.014067
16.
MoriK.SamataS.MitsugiN.TeramotoA., et al. “Influence of Silicon Wafer Surface Roughness on Semiconductor Device Characteristics”. Jpn. J. Appl. Phys. 2020. 59(SM): SMMB06. https://doi.org/10.35848/1347-4065/Ab918c
17.
BeardM.A.GhitaO.R.EvansK.E.. “Using Raman Spectroscopy to Monitor Surface Finish and Roughness of Components Manufactured by Selective Laser Sintering”. J. Raman Spectrosc. 2011. 42(4): 744–748. https://doi.org/10.1002/jrs.2771
18.
EkoiE.J.GowenA.DorrepaalR.DowlingD.P.. “Characterisation of Titanium Oxide Layers Using Raman Spectroscopy and Optical Profilometry: Influence of Oxide Properties”. Results Phys. 2019. 12: 1574–1585. https://doi.org/10.1016/j.rinp.2019.01.054
19.
WangQ.LiY.BaiB.MaoW., et al. “Effects of Silicon Dioxide Surface Roughness on Raman Characteristics and Mechanical Properties of Graphene”. RSC Adv. 2014. 4(98): 55087–55093. https://doi.org/10.1039/C4RA08369E
20.
YaoS.ZhongB.GuoC.NiJ., et al. “Effect of Copper Surface Roughness on the High-Temperature Structural Stability of Single-Layer-Graphene”. Materials. 2024. 17(7): 1648. https://doi.org/10.3390/ma17071648
21.
Molina-ContrerasJ.R.Medina-GutiérrezC.Frausto-ReyesC.Trejo-VázquezR., et al. “Surface Dependent Behaviour of Cds LO-Phonon Mode”. J. Phys. D: Appl. Phys. 2007. 40(16): 4922–4927. https://doi.org/10.1088/0022-3727/40/16/025
22.
Frausto-ReyesC.Molina-ContrerasJ.R.Medina-GutiérrezC.CalixtoS.. “CdTe Surface Roughness by Raman Spectroscopy Using the 830 nm Wavelength”. Spectrochim. Acta, Part A. 2006. 65(1): 51–55. https://doi.org/10.1016/j.saa.2005.07.082
23.
NandaK.K.SahuS.N.SoniR.K.TripathyS.. “Raman Spectroscopy of PbS Nanocrystalline Semiconductors”. Phys. Rev. B. 1998. 58(23): 15405–15407. https://doi.org/10.1103/physrevb.58.15405
CongX.LiuX.L.LinM.L.TanP.H.. “Application of Raman Spectroscopy to Probe Fundamental Properties of Two-Dimensional Materials”. Npj 2D Mater. Appl. 2020. 4(1): 13. https://doi.org/10.1038/S41699-020-0140-4
26.
AroraA.K.RajalakshmiM.RavindranT.R.SivasubramanianV.. “Raman Spectroscopy of Optical Phonon Confinement in Nanostructured Materials”. J. Raman Spectrosc. 2007. 38(6): 604–617. https://doi.org/10.1002/jrs.1684
SchmittM.PoppJ.. “Raman Spectroscopy at the Beginning of the Twenty-First Century”. J. Raman Spectrosc. 2006. 37(1-3): 20–28. https://doi.org/10.1002/jrs.1486
29.
LiX.LiuD.WangD.. “Anharmonic Phonon Decay in Polycrystalline CdTe Thin Film”. Appl. Phys. Lett. 2018. 112(25): 252105. https://doi.org/10.1063/1.5033987
30.
LiuD.ChenJ.WangD.WuL.WangD.. “Enhanced Surface Optical Phonon in CdTe Thin Film Observed by Raman Scattering”. Appl. Phys. Lett. 2018. 113(6): 061604. https://doi.org/10.1063/1.5041021
31.
Medel-RuizC.I.Pérez-Ladrón de GuevaraH.Molina-ContrerasJ.R.Frausto-ReyesC.. “Fano Effect in Resonant Raman Spectrum of CdTe”. Solid State Commun. 2020. 312: 113895. https://doi.org/10.1016/j.ssc.2020.113895
32.
Medel-RuizC.I.Molina-ContrerasJ.R.Frausto-ReyesC.Sevilla-EscobozaJ.R.Pérez-Ladrón de GuevaraH.. “Influence of the Surface Roughness on Electron–Phonon Interaction in an Intrinsic CdTe Single Crystal”. Phys. B. 2021. 603: 412785. https://doi.org/10.1016/j.physb.2020.412785
TurrellG.DelhayeM.DhamelincourtP.. “Characteristics of Raman Microscopy”. In: TurrellG.CorsetJ., editors. Raman Microscopy: Developments and Applications. Amsterdam: Elsevier Academic Press, 1996. Chap. 2, Pp. 27–50.
35.
MezragF.BouarissaN.. “Pseudopotential Study of CdTe Quantum Dots: Electronic and Optical Properties”. Mater. Res. 2019. 22(3): E20171146. https://doi.org/10.1590/1980-5373-MR-2017-1146
36.
WuS.F.RichardP.WangX.B.LianC.S., et al. “Raman Scattering Investigation of the Electron–Phonon Coupling in Superconducting Nd(O,F)Bis2”. Phys. Rev. B. 2014. 90(5): 054519. https://doi.org/10.1103/physrevb.90.054519
37.
TanwarM.BansalL.RaniC.RaniS., et al. “Fano-Type Wavelength-Dependent Asymmetric Raman Line Shapes from MoS2 Nanoflakes”. ACS Phys. Chem. Au. 2022. 2(5): 417–422. https://doi.org/10.1021/acsphyschemau.2c00021
38.
SaxenaS.K.BorahR.KumarV.RaiH.M., et al. “Raman Spectroscopy for Study of Interplay Between Phonon Confinement and Fano Effect in Silicon Nanowires”. J. Raman Spectrosc. 2016. 47(3): 283–288. https://doi.org/10.1002/jrs.4820
39.
BaranowskiJ.M.MozdzonekM.DabrowskiP.GrodeckiK., et al. “Observation of Electron–Phonon Couplings and Fano Re-Sonances in Epitaxial Bilayer Graphene”. Graphene. 2013. 2(4): 115–120. https://doi.org/10.4236/graphene.2013.24017
40.
AgerJ.W.IIIWalukiewiczW.McCluskeyM.PlanoM.A.LandstrassM.I.. “Fano Interference of the Raman Phonon in Heavily Boron-Doped Diamond Films Grown by Chemical Vapor Deposition”. Appl. Phys. Lett. 1995. 66: 616–618. https://doi.org/10.1063/1.114031
TaiF.C.LeeS.C.ChenJ.WeiC.ChangS.H.. “Multipeak Fitting Analysis of Raman Spectra on DLCH Film”. J. Raman Spectrosc. 2009. 40(8): 1055–1059. https://doi.org/10.1002/jrs.2234
43.
PrasadN.KarthikeyanB.. “Resonant and Off-Resonant Phonon Properties of Wurtzite Zns: Effect of Morphology on FröhLich Coupling and Phonon Lifetime”. J. Phys. Chem. C. 2018. 122(31): 18117–18123. https://doi.org/10.1021/acs.jpcc.8b05164
44.
Rangel-CárdenasJ.SobralH.. “Optical Absorption Enhancement in CdTe Thin Films by Microstructuration of the Silicon Substrate”. Materials. 2017. 10(6): 607. https://doi.org/10.3390/ma10060607
WilsonE.B.Jr.DeciusJ.C.CrossP.C.. “Potential Functions”. In: WilsonE.B.DeciusJ.C.CrossP.C., editors. Molecular Vibrations: The Theory of Infrared and Raman Vibrational Spectra. New York: Dover Publications, 1980. Chap. 8, Pp. 201–205.
47.
WuJ.B.LinM.L.CongX.LiuH.N.TanP.H.. “Raman Spectroscopy of Graphene-Based Materials and Its Applications in Related Devices”. Chem. Soc. Rev. 2018. 47(5): 1822–1873. https://doi.org/10.1039/C6CS00915H
ChernikovA.BornwasserV.KochM.ChatterjeeS., et al. “Phonon-Assisted Luminescence of Polar Semiconductors: Fröhlich Coupling Versus Deformation-Potential Scattering”. Phys. Rev. B. 2012. 85(3): 035201. https://doi.org/10.1103/physrevb.85.035201
51.
RosensteinB.ShapiroB.Y.. “High-Temperature Superconductivity in Single Unit Cell Layer FeSe Due to Soft Phonons in the Interface Layer of the SrTiO3 Substrate”. Phys. Rev. B. 2019. 100(5): 054514. https://doi.org/10.1103/physrevb.100.054514
52.
LiuT.H.ZhouJ.LiM.DingZ., et al. “Electron Mean-Free-Path Filtering in Dirac Material for Improved Thermoelectric Performance”. Proc. Natl. Acad. Sci. U.S.A. 2018. 115(5): 879–884. https://doi.org/10.1073/pnas.1715477115
53.
ZhuS.ZhengW.LuX.HuangF.. “Temperature-Dependent Optical Phonon Shifts and Splitting in Cubic 10BP, Natbp, and 11BP Crystals”. Opt. Lett. 2021. 46(19): 4844–4847. https://doi.org/10.1364/OL.439751
54.
HaoQ.XiaoY.ChenQ.. “Determining Phonon Mean Free Path Spectrum by Ballistic Phonon Resistance Within a Nanoslot-Patterned Thin Film”. Mater. Today Phys. 2019. 10: 100126. https://doi.org/10.1016/j.mtphys.2019.100126
55.
WhalleyL.D.SkeltonJ.M.FrostJ.M.WalshA.. “Phonon Anharmonicity, Lifetimes, and Thermal Transport in CH3NH3PbI3 from Many-Body Perturbation Theory”. Phys. Rev. B. 2016. 94(22): 220301. https://doi.org/10.1103/physrevb.94.220301
56.
ZhuS.LuX.ZhengW.. “Isotope Effects on the Optical Phonons of Cubic Boron Phosphide”. Phys. Status Solidi B. 2023. 260(5): 2200585. https://doi.org/10.1002/pssb.202200585
57.
LombardiJ.R.BirkeR.L.. “Theory of Surface-Enhanced Raman Scattering in Semiconductors”. J. Phys. Chem. C. 2014. 118(20): 11120–11130. https://doi.org/10.1021/jp5020675
58.
AmirtharajP.M.PollakF.H.. “Raman Scattering Study of the Properties and Removal of Excess Te on CdTe Surfaces”. Appl. Phys. Lett. 1984. 45(7): 789–791. https://doi.org/10.1063/1.95367
59.
ZhuS.ZhengW.LuX.ChengL., et al. “Identification of TO and LO Phonons in Cubic Natbp, 10BP and 11BP Crystals”. Appl. Phys. Lett. 2021. 118(16): 162106. https://doi.org/10.1063/5.0048871
