Abstract
This paper presents a study on ZnO-based n-type thin films doped with Al, Ga, and Sn deposited on the glass substrates, using the solution derived by sol–gel reactions. The basic material properties associated with using the alternative chemical substances in synthesis process and different dopants to generate n-type conductivity in ZnO-based thin films which are transparent oxides, are investigated and discussed. Namely, the crystal structure and surface morphology of the obtained films were examined by means of XRD analysis and field-effect scanning electron microscope (FESEM). The electric properties of those films were characterized by Hall-effect measurements and temperature dependence of electrical conductivity, as well as Seebeck coefficients. The remarkable advantages corresponding to the certain characterization of each material composition were compared together. The aim is to fully understand the performance limitation of known materials and to set the scene for a suitable synthesis condition to get optimized materials for thermoelectric applications.
Highlights
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ZnO thin films doped with Al, Ga and Sn in the range from 1 to 3 mol % were fabricated by dip coating technique using the solutions derived by sol–gel reactions.
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The grain sizes and shapes together with the grain boundary were affected by doping contents and different size of doping ions. Namely, the grain size of AZO and GZO samples is smaller than that of ZnO and SZO ones, meanwhile it is scarcely changed with increasing Sn concentration for SZO films.
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Among samples, Ga doped ZnO demonstrate most improved thermoelectric properties as compared to the Al- and Sn-doped ZnO. Introduction of Sn into ZnO lattice also remarkably increases the electrical parameters at room tempertature and the transport property throughout its temperature-dependent electrical conductivity and Seebeck coefficient.
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References
Zemskov VS, Shelimova LE, Konstantinov PP, Avilov ES, Kretova MA, Nikhezina IYu (2012) Thermoelectric materials based on layered chalcogenides of bismuth and lead. Inorg Mater: Appl Res 3(1):61–68
Powell A, Vaqueiro P (2016) Chalcogenide thermoelectric materials. In: Iris Nandhakumar, White Neil M, Stephen Beeby (ed), Thermoelectric materials and devices, RSC energy & environment series (Ch. 2). Royal Society of Chemistry, Thomas Graham House, Science Park, Milton Road, Cambridge, CB4 0WF, UK: 27–59
Li S, Li X, Ren Z, Zhang Q (2018) Recent progress towards high performance of tin chalcogenide thermoelectric materials. J Mater Chem A 6:1–33
Tsubota T, Ohtaki M, Eguchi K, Arai H (1997) Thermoelectric properties of Al-doped ZnO as a promising oxidematerial for high-temperature thermoelectric conversion. J Mater Chem 7(1):85–90
Kim KH, Shim SH, Shim KB, Niihara K, Hojo J (2005) Microstructural and thermoelectric characteristics of zinc oxide‐based thermoelectric materials fabricated using a spark plasma sintering process. J Am Ceram Soc 88(3):628–632
Wang C, Wang Y, Zhang G, Peng C (2013) Electronic structure and thermoelectric properties of ZnO single-walled nanotubes and nanowires. J Phys Chem C 117(41):21037–21042
Abutaha AI, Sarath Kumar SR, Alshareef HN (2013) Crystal orientation dependent thermoelectric properties of highly oriented aluminum doped zinc oxide thin films. Appl Phys Lett 102:053507
Saini S et al. (2016) Effect of self-grown seed layer on thermoelectric properties of ZnO thin films. Thin Solid Films 605:289–294
Mohammed MA, Sudin I, Noor AM, Rajoo S, Uday MB, Obayes NH, Omar MF(2018) A review of thermoelectric ZnO nanostructured ceramics for energy recovery J Int J Eng Technol 2:6649–6655
Mele P et al. (2013) Effect of substrate on thermoelectric properties of Al-doped ZnO thin films Appl Phys Lett 102:253903
Cai K, Müller E, Drašar C, Mrotzek A (2003) Preparation and thermoelectric properties of Al-doped ZnO ceramics. Mater Sci Eng: B 104(1):45–48
Cai KF et al. (2003) Preparation and thermoelectric properties of Al-doped ZnO ceramics. Mater Sci Eng B 104(–2):45–48
Fujishiro Y et al. (2003) Effect of microstructural control on thermoelectric properties of hot-pressed aluminum-doped zinc oxide. J Am Ceram Soc 86(12):2063–2066
Qu XR et al. (2011) Thermoelectric properties and electronic structure of Al-doped ZnO. Solid State Commun 151(4):332–336
Yamaguchi H, Chonan Y, Oda M, Komiyama T, Aoyama T, Sugiyama S (2011) Thermoelectric properties of ZnO ceramics co-doped with Al and transition metals. J Electron Mater 4(5):723–727
Zhang L, Tosho T, Okinaka N, Akiyama T (2008) Thermoelectric properties of solution combustion synthesized Al-doped ZnO. Mater Trans 49(12):2868–2874
Jood P et al. (2011) Al-doped zinc oxide nanocomposites with enhanced thermoelectric properties. Nano Lett 11(10):4337–4342
Nam WH, Lim YS, Choi S-M, Seo W-S, Lee JY (2012) High-temperature charge transport and thermoelectric properties of a degenerately Al-doped ZnO nanocomposite. J Mater Chem 22(29):14633–14638
Jun M-C, Park S-U, Koh J-H (2012) Comparative studies of Al-doped ZnO and Ga-doped ZnO transparent conducting oxide thin films. Nanoscale Res Lett 7:639
Trinh TQ, Nguyen TT, Vu DV, Le DH (2017) Structural and thermoelectric properties of Al-doped ZnO thin films grown by chemical and physical methods. J Mater Sci: Mater Electron 28(1):236–240
Paul GK, Sen SK (2002) Sol–gel preparation, characterization and studies on electrical and thermoelectrical properties of gallium doped zinc oxide films. Mater Lett 57:742–746
Ahn BD, Oh SH, Hong DU, Shin DH, Moujoud A, Kim HJ (2008) Transparent Ga-doped zinc oxide-based window heaters fabricated by pulsed laser deposition. J Cryst Growth 310:3303–3307
Barasheed AZ, Sarath Kumar SR, Alshareef HN (2013) Temperature dependent thermoelectric properties of chemically derived gallium zinc oxide thin films. J Mater Chem C 1:4122–4127
Sim KU, Shin SW, Moholkar AV, Yun JH, Moon JH, Kim JH (2010) Effects of dopant (Al, Ga, and In) on the characteristics of ZnO thin films prepared by RF magnetron sputtering system. Curr Appl Phys 10:S463–S467
Jood P, Peleckis G, Wang X, Dou SX (2012) Effect of gallium doping and ball milling process on the thermoelectric performance of n-type ZnO. J Mater Res 27(17):2278–2285
Kazeoka M et al. (1998) Improvement in thermoelectric properties of (ZnO)/In2O3 through partial substitution of yttrium for indium. J Mater Res 13(3):523–526
Ohta H, Seo WS, Koumoto K (1996) Thermoelectric properties of homologous compounds in the ZnO–In2O3 system. J Am Ceram Soc 79(8):2193–2196
Kaga H, Asahi R, Tani T (2004) Thermoelectric properties of doped (ZnO)(m)In2O3. Jpn J Appl Phys Pt 1 43(6A):3540–3543
Park K et al. (2009) Zn1−xBixO (0 < x < 0.02) for thermoelectric power generations. J Alloys Compd 485(1–2):532–537
Park K, Seong JK, Kim GH (2009) NiO added Zn1−xNixO (0 < x < 0.05) for thermoelectric power generation. J Alloys Compd 473(1–2):423–427
Colder H et al. (2011) Preparation of Ni-doped ZnO ceramics for thermoelectric applications. J Eur Ceram Soc 31(15):2957–2963
Park K, Seong JK, Nahm S (2008) Improvement of thermoelectric properties with the addition of Sb to ZnO. J Alloys Compd 455(1–2):331–335
Park K et al. (2008) Influence of SnO2 addition on the thermoelectric properties of Zn1−xSnxO (0.01 ≤ x ≤ 0.05). Mater Res Bull 43(1):54–61
Park K, Seong JK (2008) Influence of simultaneous addition of Sb2O3 and SnO2 on thermoelectric properties of Zn1-x-ySbxSnyO prepared by tape casting. J Alloys Compd464(1–2):1–5
Seo DK et al. (2011) Drastic improvement of oxide thermoelectric performance using thermal and plasma treatments of the InGaZnO thin films grown by sputtering. Acta Mater 59(17):6743–6750
Wu Z-H, Xie H-Q, Zhai Y-B (2015) Preparation and thermoelectric properties of Co-doped ZnO synthesized by sol–gel. J Nanosci Nanotechnol 15:3147–3150
Colder H, Guilmeau E, Harnois C, Marinel S, Retoux R, Savary E (2011) Preparation of Ni-doped ZnO ceramics for thermoelectric applications. J Eur Ceram Soc 31(15):2957–2963
Koresh I, Amouyal Y (2017) Effects of microstructure evolution on transport properties of thermoelectric nickel-doped zinc oxide. J Eur Ceram Soc 37(11):3541–3550
Majumdar A (2004) Thermoelectricity in semiconductor nanostructures. Science 303(5659):777–778
Dresselhaus MS et al. (2007) New directions for low-dimensional thermoelectric materials. Adv Mater 19(8):1043–1053
Lan Y et al. (2010) Enhancement of thermoelectric figure-of-merit by a bulk nanostructuring approach. Adv Funct Mater 20(3):357–376
Koumoto K et al. (2010) Oxide thermoelectric materials: a nanostructuring approach. Annu Rev Mater Res 40:363–394
Kanatzidis MG (2009) Nanostructured thermoelectrics: the new paradigm. Chem Mater 22(3):648–659
Venkatasubramanian R et al. (2001) Thin-film thermoelectric devices with high room-temperature figures of merit. Nature 413(6856):597–602
Chhatrasal Ga, Kamal KKar (2016) Recent advances in thermoelectric materials. Prog Mater Sci 83:330–382
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This work has been funded by Hanoi University of Science and Technology (HUST) under Grant number T2017-LN-07.
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Viet Vu, D., Hai Le, D., Xuan Nguyen, C. et al. Comparison of structural and electric properties of ZnO-based n-type thin films with different dopants for thermoelectric applications. J Sol-Gel Sci Technol 91, 146–153 (2019). https://doi.org/10.1007/s10971-019-05024-0
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DOI: https://doi.org/10.1007/s10971-019-05024-0