Abstract
Lithium-doped ZnO thin films (ZnO : Li x ) were prepared by spray pyrolysis method on the glass substrates for x (x = [Li]/[Zn]) value varied between 5 and 70%. Structural, electrical and optical properties of the samples were studied by X-ray diffraction (XRD), UV-Vis-NIR spectroscopy, scanning electron microscopy (SEM), Hall effect and sheet resistance measurements. XRD results show that for x ≤ 50%, the structure of the films tends to be polycrystals of wurtzite structure with preferred direction along (0 0 2). The best crystalline order is found at x = 20% and the crystal structure is stable until x = 60%. The Hall effect results describe that Li doping leads to change in the conduction type from n- to p-type, again it changes to n-type at x = 70% and is attributed to self-compensation effect. Moreover, the carrier density was calculated in the order of 1013 cm−3. The resistivity of Li-doped films decreases until 22 Ω cm at x = 50%. Optical bandgap was reduced slightly, from 3.27 to 3.24 eV as a function of the grain size. Optical transmittance in the visible range reaches T = 97%, by increasing of Li content until x = 20%. Electrical and optical properties are coherent with structural results.
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Ando K, Saito H, Jin Z, Fukumura T, Kawasaki M, Matsumoto Y and Koinuma H 2001 J. Appl. Phys. 89 7284
Bagheri-Mohagheghi M M, Shahtahmasebi N, Alinejad M R, Youssefi A and Shokooh-Saremi M 2008 Phys. B: Condens. Matter 403 2431
Bagheri-Mohagheghi M M, Shahtahmasebi N, Alinejad M R, Youssefi A and Shokooh-Saremi M 2009 Solid State Sci. 11 233
Bin W, Yue Z, Jiahua M and Wenbin S 2009 Appl. Phys. A94 715
Birgin E G, Chambouleyron I and Martinez J M 1999 J. Comput. Phys. 151 862
Bilgin V 2009 J. Electron. Mater. 38 1969
Chen Y Q, Zheng X J, Mao S X and Li W 2010 J. Appl. Phys. 107 094302
Chu H, Wei L, Cui R, Wang J and Li Y 2010 Coordination Chem. Rev. 254 1117
Gal D, Hodes G, Lincot D and Schock H W 2000 Thin Solid Films 361 79
Jeong I S, Kim J H and Im S 2003 Appl. Phys. Lett. 83 2946
Joint Committee on Powder Diffraction Standards, Powder Diffraction File, (Philadelphia, PA: ASTM, 1967). Card 0361451 (for ZnO hexagonal) and 40831 (for Zn hexagonal)
Kanai Y 1991a Jpn. J. Appl. Phys. 30 703
Kanai Y 1991b Jpn. J. Appl. Phys. 30 2021
Lee E C and Chang K J 2006 Phys. B: Condens. Matter 376 707
Lander J J 1960 J. Phys. Chem. Solids 15 324
Lin W, Ma R, Shao W and Liu B 2007 Appl. Surf. Sci. 253 5179
Look D C, Claflin B, Alivov Y I and Park S J 2004 Phys. Status Solidi (A) 201 2203
Meyer B K, Stehr J, Hofstaetter A, Volbers N, Zeuner A and Sann J 2007 Appl. Phys. A88 119
Mohamed G A, Abd El-Moiz A B and Rashad M 2005 Phys. B: Condens. Matter 370 158
Mohamed G A, Mohamed E M and Abu El-Fadl A 2001 Phys. B: Condens. Matter 308 949
Nayak P K, Jang J, Lee C and Hong Y 2009 Appl. Phys. Lett. 95 193503
Özgür U, Alivov Y I, Liu C, Teke A, Reshchikov M A, Dogan S and Morkoc H 2005 J. Appl. Phys. 98 041301
Sberveglieri G, Groppelli S, Nelli P, Quaranta F, Valentini A and Vasanelli L 1992 Sens. Actuators B: Chem. 7 747
Soki T T, Hatanaka Y and Look D C 2000 Appl. Phys. Lett. 76 3257
Studenikin S A, Golego N and Cocivera M 2000 J. Appl. Phys. 87 2413
Srikant V and Clarke D R 1998 J. Appl. Phys. 83 5447
Srikant V and Clarke D R 1997 J. Mater. Res. 12 1425
Zeng Y J, Ye Z Z, Xu W Z, Chen L L, Li D Y, Zhu L P and Hu Y L 2005 J. Cryst. Growth 283 180
Zeng Y J, Ye Z Z, Xu W Z, Li D Y, Lu J G, Zhu L P and Zhao B H 2006 Appl. Phys. Lett. 88 2172743
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Ardyanian, M., Sedigh, N. Heavy lithium-doped ZnO thin films prepared by spray pyrolysis method. Bull Mater Sci 37, 1309–1314 (2014). https://doi.org/10.1007/s12034-014-0076-4
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DOI: https://doi.org/10.1007/s12034-014-0076-4