Lead telluride nanocrystalline thin films: Structure, optical characterization and a broadband dielectric spectroscopy study

다국어 초록 (Multilingual Abstract)

Nanocrystalline PbTe thin films were deposited on a glass substrate by thermal evaporation technique with two thicknesses namely, 45 and 250 nm. The structural studies revealed that the films have nanocrystalline cubic structure and the particle size was found to be 11 and 20.7 nm, for low and high thicknesses respectively. The FESEM study shows that the surface grains increase for higher thickness film. This indicates that samples lying under the strong regime of confinement for PbTe thin films. The optical properties confirm the occurrence of confinement process as the optical band gap are 1.67 and 0.9 eV for 45 and 250 nm films, respectively. The dielectric results indicated that the conductivity increases by about two orders of magnitude with increasing the thickness from 45 to 250 nm. Moreover, the permittivity shows a higher dispersion step at lower frequencies in both samples due to the hopping conduction mechanism in addition to the interfacial polarization in such heterogeneous structures. Another small dispersion step is noticed in case of the lower thickness. It is attributed to the polarization of the accumulated charge carriers near the grain boundaries interfaces. No indication of any electrode phenomena in both samples is shown here.

참고문헌 (Reference)

1 Yongan Yang, "Wafer-Scale Patterning of Lead Telluride Nanowires: Structure, Characterization, and Electrical Properties" American Chemical Society (ACS) 3 (3): 4144-4154, 2009

2 Z. Dashevsky, "Thermoelectric efficiency in graded indium-doped PbTe crystals" AIP Publishing 92 (92): 1425-1430, 2002

3 Khang Hoang, "Theoretical study of deep-defect states in bulk PbTe and in thin films" American Physical Society (APS) 76 (76): 2007

4 Y. Yang, "Synthesis of PbTe nanowire arrays using litlhographically patterned nanowire electrodeposition" 8 : 2447-2451, 2008

5 L KUNGUMADEVI, "Synthesis of PbTe nanocubes, worm-like structures and nanoparticles by simple thermal evaporation method" Springer Science and Business Media LLC 36 (36): 771-778, 2013

6 Ying Li, "Synthesis and thermoelectric properties of defect-containing PbSe–PbTe heterojunction nanostructures" Royal Society of Chemistry (RSC) 7 (7): 53855-53860, 2017

7 B. Wan, "Synthesis and thermoelectric properties of PbTe nanorods and microcubes" 163 : 57-61, 2009

8 K. Sridharan, "Synthesis and nonlinear optical properties of Lead Telluride nanorods" 34 : 639-645, 2012

9 W. M. Darwish, "Synthesis and electric modulus formalism of novel metal-phthalocyanine bridged polymers" 24 : 858-864, 2014

10 A. N. Harbachova, "Surface microstructure and optical properties of PbTe films on semiconductor and dielectric substrates" 3 : 140-146, 2010

11 L. Kungumadevi, "Structural, electrical, and optical properties of PbTe thin films prepared by simple flash evaporation method" 2012 : 763209-, 2012

12 U. P. Khairnar, "Structural and transport properties of PbTe thin films by thermal evaporation" 2 : 1529-1538, 2012

13 M. A. Mahdy, "Structural and optical properties of PbSe nanostructure thin films prepared by inert gas condensation" 59 : 117-123, 2014

14 Ileana Pop, "Structural and optical properties of PbS thin films obtained by chemical deposition" Elsevier BV 307 (307): 240-244, 1997

15 Y. Pan, "Size controlled synthesis of monodisperse PbTe quantum dots : using oleylamine as the capping ligand" 22 : 23593-23601, 2012

16 S. Kumar, "Schottky barrier junctions of gold with lead chalcogenides : growth and characteristics" 9 : 99-103, 2012

17 Y. W. Tung, "Relativistic Band Structure and Electronic Properties of SnTe, GeTe, and PbTe" American Physical Society (APS) 180 (180): 823-826, 1969

18 Hans Zogg, "Photovoltaic lead-chalcogenide on silicon infrared sensor arrays" SPIE-Intl Soc Optical Eng 33 (33): 1440-, 1994

19 R.A. Orozco, "Pbs-Cds bilayers prepared by the chemical bath deposition technique at different reaction temperatures" 343–344 : 587-590, 1999

20 E. Kaufmann, "PbTe and SnTe quantum dot precipitates in a CdTe matrix fabricated by ion implantation" 106 : 043105-043105, 2009

21 J.I. Pankove, "Optical Processes in Semiconductors" Prentice- Hall, Inc. 1971

22 S. Min Yong, "One-step hydrothermal synthesis of carbone-coated PbTe nanowires for thermoelectric applications" 28 : 13-16, 2011

23 Shuchitangshu Chatterjee, "Low-cost solar selective absorbers from Indian galena" SPIE-Intl Soc Optical Eng 32 (32): 2923-2929, 1993

24 H. W. Leite Alves, "Lattice contribution to the high dielectric constant of PbTe" American Physical Society (APS) 87 (87): 115204-115205, 2013

25 "JCPDS-international Centre for Diffraction Data"

26 S. Thirumavalavan, "Investigation of the structural, optical and electrical properties of copper selenide thin films" 18 : 1000-1007, 2015

27 Shereen Shabaan Omara, "Hyperbranched poly(amidoamine)/kaolinite nanocomposites: Structure and charge carrier dynamics" Elsevier BV 121 : 64-74, 2017

28 I-Na Chao, "Growth and characterization of IV–VI semiconductor heterostructures on (100) BaF2" Elsevier BV 323 (323): 126-135, 1998

29 M. Barsoum, "Fundamentals of Ceramics" McGraw Hill 543-, 1977

30 M. Sabet, "Fabrication of inorganic sensitized solar cells by drop casting deposition of PbSe and PbTe on the TiO2 surface" 7 : 323-330, 2017

31 E. Rodriguez, "Fabrication and characterization of a PbTe quantum dots multilayer structure" Elsevier BV 26 (26): 361-365, 2005

32 Jian Zhang, "Extraordinary Thermoelectric Performance Realized in n-Type PbTe through Multiphase Nanostructure Engineering" Wiley 29 (29): 1703148-, 2017

33 B.D. Cullitty, "Elements of X-Ray Diffraction" Addison-Wesley 1978

34 A. S. Barros, "Electrical and optical properties of PbTe p-n junction infrared sensors" AIP Publishing 99 (99): 024904-, 2006

35 E.I. Rogacheva, "Effect of oxidation on thickness dependencies of thermoelectric properties in PbTe/mica thin films" Elsevier BV 476 (476): 391-395, 2005

36 N. A. Hegab, "Effect of Cd addition on the AC conductivity and dielectric properties of Ge70Te30 films" 3 : 71-82, 2007

37 Yasuo Kanai, "Dielectric Constant of PbTe" Japan Society of Applied Physics 2 (2): 6-10, 1963

38 A.M. Samoylov, "Crystal structure, carrier concentration and IR-sensitivity of PbTe thin films doped with Ga by two different methods" Elsevier BV 240 (240): 340-346, 2002

39 M. E. Abd El-Aziz, "Conducting hydrogel based on chitosan, polypyrrole and magnetite nanoparticles: a broadband dielectric spectroscopy study" Springer Science and Business Media LLC 76 (76): 3175-3194, 2018

40 J. Tauc, "Amorphous and Liquid Semiconductors" Plenum 1974

41 I. K. El Zawawi, "Air-stable Cd0. 23Zn0. 77Te nanostructure thin films" 26 : 1950-1958, 2015

42 A. E. Bekheet, "Ac conductivity and dielectric properties of Ga2S3-Ga2Se3 films" 403 : 4342-4346, 2008

43 N. Shukla, "AC-Conductivity and dielectric properties of Se90Cd6Sb4 glassy alloy" 13 : 177-185, 2016

44 L. Kungumadevi, "AC conductivity and dielectric properties of thermally evaporated PbTe thin films" Elsevier BV 54 (54): 58-62, 2010

45 B. A. Hasan, "AC conduction and dielectric characterization of vacuum evaporated PbSe thin films" 3 : 71-76, 2014

46 Qingyu Yan, "A Simple Chemical Approach for PbTe Nanowires with Enhanced Thermoelectric Properties" American Chemical Society (ACS) 20 (20): 6298-6300, 2008