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Transparent conductive oxide (TCO) films, as transparent electrodes, are widely used in thin-film solar cells. The performance of TCO film has a significant influence on the conversion efficiency of the film solar cell fabricated byusing it. Although the conductivity can be improved by increasing the carrier concentration, the transmittance in the long wave will be sacrificed. Therefore, the only feasible method is to increase the carrier mobility within a certain carrier concentration range, rather than increase the mobility by reducing carrier concentration. In this paper, the F and Al co-doped ZnO (FAZO) films are deposited on glass substrates (Corning XG) by an RF magnetron sputtering technique with using a small amount of ZnF2 (1 wt.%) and Al2O3 (1 wt.%) dopant. The influences of sputtering pressure on the structure, morphology and photoelectric characteristics of the films are respectively investigated by X-ray diffraction analysis, scanning electron microscope, Hall effect measurement, and ultraviolet–visible–near infrared spectrophotometry. All the thin films show typical wurtzite structure with the c axis preferentially oriented perpendicular to the substrate. With the increase of sputtering pressure, the deposition rate of FAZO film decreases, the crystallization quality is deteriorated, surface topography changes gradually from “crater-like” to co-existent “crater-like” and “granular-like”, and the surface roughness increases. The FAZO film deposited at 0.5 Pa presents the optimal performance with a mobility of 40.03 cm2/V·s, carrier concentration of 3.92 × 1020 cm–3, resistivity of 3.98 × 10–4 Ω·cm, and about 90% average transmittance in a range of 380-1200 nm. The theoretical result shows that the co-doping of F and Al takes the advantages of single F and Al doped ZnO films, and overcomes the shortcoming of metal elements doping, which donates the carriers just from doped metal elements. Furthermore, the co-doping of F and Al not only increases the carriers but also reduces the scatterings caused by the inter-orbital interaction of doped atoms. The doped F 2p electron orbitals repel the O 2p and Zn 4s electron orbitals, making them move down and donate electrons. At the same time, the orbitals of Al 3s and Al 3p also make a contribution to the conductivity. After co-doping of F and Al, both the carrier concentration and conductivity increase significantly.
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Keywords:
- F and Al co-doped ZnO film /
- magnetron sputtering /
- first principle calculations /
- solar cells
[1] Gordon R G 2000 MRS Bull. 25 52
[2] Minami T 2000 MRS Bull. 25 38
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[12] Li Q, Zhu L P, Li Y G, Zhang X Y, Niu W Z, Guo Y M, Ye Z Z 2017 J. Alloys Compd. 697 156Google Scholar
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Wang Y F, Huang Q, Song Q G, Liu Y, Wei C C, Zhao Y, Zhang X D 2012 Acta Phys. Sin. 61 137801Google Scholar
[19] 王延峰, 张晓丹, 黄茜, 杨富, 孟旭东, 宋庆功, 赵颖 2013 物理学报 62 247802Google Scholar
Wang Y F, Zhang X D, Huang Q, Yang F, Meng X D, Song Q G, Zhao Y 2013 Acta Phys. Sin. 62 247802Google Scholar
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[21] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865Google Scholar
[22] Vanderbilt D 1990 Phys. Rev. B 41 7892Google Scholar
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Wang Y F, Meng X D, Zheng W, Song Q G, Zhai C X, Guo B, Zhang Y, Yang F, Nan J Y 2016 Acta Phys. Sin. 65 087802Google Scholar
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[37] 张富春, 张志勇, 张威虎, 阎军峰, 贠江妮 2009 光学学报 29 2015
Zhang F C, Zhang Z Y, Zhang W H, Yan J F, Yun J N 2009 Acta Opt. Sin. 29 2015
[38] Wang Y F, Zhang X D, Meng X D, Cao Y, Yang F, Nan J Y, Song Q G, Huang Q, Wei C C, Zhang J J, Zhao Y 2016 Sol. Energy Mater. Sol. Cells 145 171Google Scholar
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[1] Gordon R G 2000 MRS Bull. 25 52
[2] Minami T 2000 MRS Bull. 25 38
[3] Moulin E, Bittkau K, Ghosh M, Bugnon G, Stuckelberger M, Meier M, Haug F J, Hüpkes J, Ballif C 2016 Sol. Energy Mater. Sol. Cells 145 185Google Scholar
[4] Jost G, Merdzhanova T, Zimmermann T, Hüpkes J 2013 Thin Solid Films 532 66Google Scholar
[5] Tao K, Sun Y, Cai H K, Zhang D X, Xie K, Wang Y 2012 Appl. Surf. Sci. 258 5943Google Scholar
[6] Warasawa M, Kaijo A, Sugiyama M 2012 Thin Solid Films 520 2119Google Scholar
[7] Wang Y F, Song J M, Bai L S, Yang F, Han B, Guo Y J, Dai B T, Zhao Y, Zhang X D 2018 Sol. Energy Mater. Sol. Cells 179 401Google Scholar
[8] Liu B F, Bai L S, Li T T, Wei C C, Li B Z, Huang Q, Zhang D K, Wang G C, Zhao Y, Zhang X D 2017 Energy Environ. Sci. 10 1134Google Scholar
[9] Zhang L, Huang J, Yang J, Tang K, Ren B, Zhang S W, Wang L J 2016 Surf. Coat. Technol. 307 1129Google Scholar
[10] Tsay C Y, Pai K C 2018 Thin Solid Films 654 11Google Scholar
[11] Kirby S D, van Dover R B 2009 Thin Solid Films 517 1958Google Scholar
[12] Li Q, Zhu L P, Li Y G, Zhang X Y, Niu W Z, Guo Y M, Ye Z Z 2017 J. Alloys Compd. 697 156Google Scholar
[13] Mallick A, Basak D 2017 Appl. Surf. Sci. 410 540Google Scholar
[14] Shi Q, Zhou K S, Dai M J, Lin S S, Hou H J, Wei C B, Hu F 2014 Ceram. Int. 40 211Google Scholar
[15] Ji X Z, Song J M, Wu T T, Tian Y, Han B, Liu X N, Wang H W, Gui Y B, Ding Y, Wang Y F 2019 Sol. Energy Mater. Sol. Cells 190 6Google Scholar
[16] Wang Y F, Song J M, Song W Y, Tian Y, Han B, Meng X D, Yang F, Ding Y, Li J J 2019 Sol. Energy 186 126Google Scholar
[17] Zheng G X, Song J M, Zhang J, Li J J, Han B, Meng X D, Yang F, Zhao Y, Wang Y F 2020 Mater. Sci. Semicond. Process. 112 105016Google Scholar
[18] 王延峰, 黄茜, 宋庆功, 刘阳, 魏长春, 赵颖, 张晓丹 2012 物理学报 61 137801Google Scholar
Wang Y F, Huang Q, Song Q G, Liu Y, Wei C C, Zhao Y, Zhang X D 2012 Acta Phys. Sin. 61 137801Google Scholar
[19] 王延峰, 张晓丹, 黄茜, 杨富, 孟旭东, 宋庆功, 赵颖 2013 物理学报 62 247802Google Scholar
Wang Y F, Zhang X D, Huang Q, Yang F, Meng X D, Song Q G, Zhao Y 2013 Acta Phys. Sin. 62 247802Google Scholar
[20] Segall M D, Lindan P J D, Probert M J, Pickard C J, Hasnip P J, Clark S J, Payne M C 2002 J. Phys. Condens. Matter 14 2717Google Scholar
[21] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865Google Scholar
[22] Vanderbilt D 1990 Phys. Rev. B 41 7892Google Scholar
[23] Sheetz R M, Ponomareva I, Richter E, Andriotis A N, Menon M 2009 Phys. Rev. B 80 195314Google Scholar
[24] 王延峰, 孟旭东, 郑伟, 宋庆功, 翟昌鑫, 郭兵, 张越, 杨富, 南景宇 2016 物理学报 65 087802Google Scholar
Wang Y F, Meng X D, Zheng W, Song Q G, Zhai C X, Guo B, Zhang Y, Yang F, Nan J Y 2016 Acta Phys. Sin. 65 087802Google Scholar
[25] Hsu F H, Wang N F, Tsai Y Z, Chuang M C, Cheng Y S, Houng M P 2013 Appl. Surf. Sci. 280 104Google Scholar
[26] Yue H, Wu A, Feng Y, Zhang X, Li T 2011 Thin Solid Films 519 5577Google Scholar
[27] Kluth O, Schöpe G, Hüpkes J, Agashe C, Müller J, Rech B 2003 Thin Solid Films 442 80Google Scholar
[28] Assunção V, Fortunato E, Marques A, Águas H, Ferreira I, Costa M E V, Martins R 2003 Thin Solid Films 427 401Google Scholar
[29] Maccoa B, Knoops H C M, Verheijen M A, Beyer W, Creatore M, Kessels W M M 2017 Sol. Energy Mater. Sol. Cells 173 111Google Scholar
[30] Pei Z L, Sun C, Tan M H, Xiao J Q, Guan D H, Huang R F, Wen L S 2001 J. Appl. Phys. 90 3432Google Scholar
[31] Sreedhar A, Kwon J H, Yi J, Gwag J S 2016 Ceram. Int. 42 14456Google Scholar
[32] Cao L, Zhu LvP, Jiang J, Zhao R, Ye Z Z, Zhao B H 2011 Sol. Energy Mater. Sol. Cells 95 894Google Scholar
[33] Xu H Y, Liu Y C, Mu R, Shao C L, Lu Y M, Shen D Z, Fan X W 2005 Appl. Phys. Lett. 86 123107
[34] Burstein E 1954 Phys. Rev. 93 632Google Scholar
[35] Moss T S 1954 Proc. Phys. Soc. London, Sect. B 67 775Google Scholar
[36] Slassi A 2015 Opt. Quantum Electron. 47 2465Google Scholar
[37] 张富春, 张志勇, 张威虎, 阎军峰, 贠江妮 2009 光学学报 29 2015
Zhang F C, Zhang Z Y, Zhang W H, Yan J F, Yun J N 2009 Acta Opt. Sin. 29 2015
[38] Wang Y F, Zhang X D, Meng X D, Cao Y, Yang F, Nan J Y, Song Q G, Huang Q, Wei C C, Zhang J J, Zhao Y 2016 Sol. Energy Mater. Sol. Cells 145 171Google Scholar
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