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The role of plasma-enhanced atomic layer deposition growth of AlGaN ternary alloys on c-planar sapphire substrates and the preparation of quantum dot-sensitized solar cells are explored in this work. The interface between the film and the substrate as well as the band gap of AlGaN ternary alloys during atomic layer deposition is dependent on Al component. At high Al fraction, there appears a good interface between the AlGaN alloy film and the substrate, however, the interface becomes rough when the Al fraction is reduced. The AlGaN alloy prepared by atomic layer deposition has a high band gap, which is related to the oxygen content within the film. Subsequently, CdSe/AlGaN/ZnS and CdSe/ZnS/AlGaN structured cells are prepared and analyzed for quantum dot solar cells from AlGaN films with an AlN/GaN cycle ratio of 1∶1. It is found that AlGaN can modify and passivate quantum dots and TiO2, which can wrap and protect the structure of TiO2 and CdSe quantum dot, thus avoiding the recombination of photo-generated carriers. This modification effect is also reflected in the improvement of open-circuit voltage, short-circuit current, filling factor and photovoltaic conversion efficiency of quantum dot solar cells. These factors are discussed in this work, trying to modify carrier transport characteristics of AlGaN films prepared by atomic layer deposition.
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Keywords:
- AlGaN /
- plasma enhanced atomic layer deposition /
- CdSe quantum dots /
- solar cell
[1] Parkhomenko R G, De Luca O, Kolodziejczyk L, Modin E, Rudolf P, Martínez D, Cunhad L, Knez M 2021 Dalton. Trans. 50 15062
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Feng J H, Tang L D, Liu B W, Xia Y, Wang B 2013 Acta Phys. Sin. 62 117302
Google Scholar
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图 8 两种结构下沉积不同周期AlGaN薄膜QDSCs的J-V曲线 (a) 5 cycles; (b) 20 cycles; (c) 30 cycles. (d) 5, 20, 30 cycles的Nyquist曲线
Figure 8. J-V curves of QDSCs of AlGaN thin films with different cycles deposited under two structures: (a) 5 cycles; (b) 20 cycles; (c) 30 cycles. (d) Nyquist curves for 5, 20 and 30 cycles.
表 1 不同循环比例生长的AlGaN薄膜的元素组成
Table 1. Elemental composition of AlGaN films grown with different cyclic ratios.
Samples Al/% Ga/% N/% O/% C/% A3G1 37.97 4.21 16.03 38.56 3.32 A1G1 31.89 7.28 20.83 35.18 4.82 A1G3 21.88 17.53 27.7 29.53 3.36 表 2 5, 20和30 cycles AlGaN薄膜不同结构J-V测试结果
Table 2. J-V test results for different structures of 5, 20 and 30 cycles AlGaN films.
Samples Jsc/(mA·cm–2) Voc/V FF/% PCE/% 5AlGaN/ZnS 9.3 0.56 60.28 3.13 ZnS/5AlGaN 7.71 0.53 60.49 2.5 20AlGaN/ZnS 8.36 0.56 62.69 2.91 ZnS/20AlGaN 7.9 0.54 56.87 2.44 30AlGaN/ZnS 6.02 0.51 65.92 2.01 ZnS/30AlGaN 5.39 0.49 58.81 1.57 RC 6.81 0.51 58.59 2.02 表 3 5, 20和30 cycles AlGaN QDSCs的电化学阻抗谱拟合结果
Table 3. Electrochemical impedance spectrum fitting results for 5, 20 and 30 cycles AlGaN QDSCs.
Samples cycles 5 20 30 ${R_{ {\text{ct-Ti} }{{\text{O} }_{\text{2} } } }}/\Omega$ 18.93 32.72 41.97 -
[1] Parkhomenko R G, De Luca O, Kolodziejczyk L, Modin E, Rudolf P, Martínez D, Cunhad L, Knez M 2021 Dalton. Trans. 50 15062
Google Scholar
[2] Zhang X L, Liu Q Y, Liu B D, Yang W J, Li J, Niu P J, Jiang X 2017 J. Mater. Chem. C 5 4319
Google Scholar
[3] Zhang X L, Liu B D, Liu Q Y, Yang W J M, Xiong C, Li J, Jiang X 2017 Appl. Mater. Interfaces 9 2669
Google Scholar
[4] Deminskyi P, Rouf P, Ivanov I G, Pedersen H 2019 J. Vac. Sci. Technol A 37 020926
Google Scholar
[5] Iliopoulos E, Moustakas T D 2002 Appl. Phys. Lett. 81 295
Google Scholar
[6] Moon Y T, Kim D J, Park J S, Oh J T, Lee J M, Ok Y W, Kim H, Park S J 2001 Appl. Phys. Lett. 79 599
Google Scholar
[7] Wu J 2009 J. Appl. Phys. 106 5
[8] Angerer H, Brunner D, Freudenberg F, Ambacher O, Stutzmann M, Höpler R, Körner H J 1997 Appl. Phys. Lett. 71 1504
Google Scholar
[9] Jain S C, Willander M, Narayan J, Overstraeten R V 2000 J. Appl. Phys. 87 965
Google Scholar
[10] Tonisch K, Buchheim C, Niebelschütz F, Schober A, Gobsch G, Cimalla V, Goldhahn R 2008 J. Appl. Phys. 104 084516
Google Scholar
[11] Jebalin B K, Shobha R A, Prajoon P, Kumar N M, Nirmal D 2015 Microelectron. J. 46 1387
Google Scholar
[12] Chakroun A, Jaouad A, Bouchilaoun M, Arenas O, Soltani A, Maher H 2017 Phys. Status Solidi A 214 1600836
Google Scholar
[13] Ruterana P, De Saint Jores G, Laügt M, Omnes F, Bellet-Amalric E 2001 Appl. Phys. Lett. 78 344
Google Scholar
[14] Yang W X, Zhao Y K, Wu Y Y, Li X F, Xing Z W, Bian L F, Lu S L, Luo M C 2019 J. Cryst. Growth 512 213
Google Scholar
[15] Puurunen R L 2005 J. Appl. Phys. 97 9
[16] Ozgit C, Donmez I, Alevli M, Biyikli N 2012 J. Vac. Sci. Technol. A 30 01A124
Google Scholar
[17] Liu S J, Zhao G, He Y F, Wei H Y, Li Y, Qiu P, Zheng X H 2019 ACS Appl. Mater. Interfaces 11 35382
Google Scholar
[18] Liu S J, He Y F, Wei H Y, Qiu P, Song Y M, An Y L, Zheng X H 2019 Chin. Phys. B 28 026801
Google Scholar
[19] Liu S J, Peng M Z, Hou C X, He Y F, Li M L, Zheng X H 2017 Nanoscale Res. Lett. 12 1
Google Scholar
[20] Qiu P, Wei H Y, An Y, Wu Q, Du W, Jiang Z, Zheng X H 2019 Ceram Int. 46 5765
[21] He Y F, Li M L, Liu S J, Wei H Y, Ye H Y, Song Y M, Zheng X H 2019 Acta Metall. Sin. (English Letters) 32 1530
Google Scholar
[22] He Y F, Li M L, Wei H Y, Song Y, Qiu P, Peng M, Zheng X H 2021 Appl. Surf. Sci. 566 150684
Google Scholar
[23] Song Y, He Y F, Li Y, Wei H Y, Qiu P, Huang Q, Zheng X H 2021 Cryst. Growth Des. 21 1778
Google Scholar
[24] Song Y M, Li Y F, He Y F, Wei H Y, Qiu P, Hu X T, Su Z L, Jiang Y, Peng M Z, Zheng X H 2022 ACS Appl. Mater. Interfaces 14 16866
Google Scholar
[25] Liu S J, Zhao G, He Y F, Li Y F, Wei H Y, Qiu P, Wang X Y, Wang X X, Cheng J D, Peng M Z, Zaera F, Zheng X H 2020 Appl. Phys. Lett. 116 211601
Google Scholar
[26] Nepal N, Anderson V R, Hite J K, Eddy C R 2015 Thin Solid Films 589 47
Google Scholar
[27] Rouf P, Palisaitis J, Bakhit B, O’Brien N J, Pedersen H 2021 J. Mater. Chem. C 9 13077
Google Scholar
[28] Choi S, Ansari A S, Yun H J, Kim H, Shong B, Choi B J 2020 J. Alloy. Compd. 854 157186
[29] Ergen O, Gilbert S M, Pham T, Turner S J, Tan M T Z, Worsley M A, Zettl A 2017 Nat. Mater. 16 522
Google Scholar
[30] Wei H Y, Wu J, Qiu P, Liu S, He Y F, Peng MZ, Li D, Meng Q, Zaera F, Zheng X H 2019 J. Mater. Chem. A 7 25347
Google Scholar
[31] Wei H Y, Qiu P, Peng M Z, Wu Q, Liu S, An Y, He Y F, Song Y M, Zheng X H 2019 Appl. Surf. Sci. 476 608
Google Scholar
[32] 李晔, 王茜茜, 卫会云, 仇鹏, 何荧峰, 宋祎萌, 段彰, 申诚涛, 彭铭曾, 郑新和 2021 70 187702
Google Scholar
Li Y, Wang X X, Wei H Y, Qiu P, He Y F, Song Y M, Duan Z, Shen C T, Peng M Z, Zheng X H 2021 Acta Phys. Sin. 70 187702
Google Scholar
[33] Zhang Q, Parimoo H, Martel E, Zhao S 2022 Ecs. J. Solid State Sc. 11 116002
Google Scholar
[34] Portillo M C, Hernández S G, Bernal Y P, Velis I M, Cab J V, Alcántara S, Alvarado J 2020 Opt. Mater. 108 110206
Google Scholar
[35] Koo A, Budde F, Ruck B, Trodahl H, Bittar A, Preston A, Zeinert A 2006 J. Appl. Phys. 99 034312
Google Scholar
[36] Choi Y Y, Choi K H, Kim H K 2011 J. Electrochem. Soc. 158 J349
Google Scholar
[37] Su L X, Chen S Y, Zhao L Q, Zuo Y Q, Xie J 2020 Appl. Phys. Lett. 117 211101
Google Scholar
[38] Sun X J, Wu C, Wang Y C, Guo D Y 2022 J. Vacuum Sci. Technol. B 40 012204
Google Scholar
[39] Zhang J, Li S L, Xiong H, Tian W, Li Y, Fang Y Y, Wu Z H, Dai J N, Xu J T, Li X Y, Chen C Q 2014 Nanoscale Res. Lett. 9 341
Google Scholar
[40] 梁琦, 杨孟骐, 张京阳, 王如志 2022 71 097302
Google Scholar
Liang Q, Yang M Q, Zhang J Y, Wang R Z 2022 Acta Phys. Sin. 71 097302
Google Scholar
[41] 冯嘉恒, 唐立丹, 刘邦武, 夏洋, 王冰 2013 62 117302
Google Scholar
Feng J H, Tang L D, Liu B W, Xia Y, Wang B 2013 Acta Phys. Sin. 62 117302
Google Scholar
[42] Motamedi P, Cadien K 2014 Appl. Surf. Sci. 315 104
Google Scholar
[43] Alevli M, Haider A, Kizir S, Leghari S A, Biyikli N 2016 J. Vac. Sci. Technol. A 34 01A137
Google Scholar
[44] Wang Q, Cheng X H, Zheng L, Shen L Y, Li J L, Zhang D L, Qian R, Yu Y H 2017 RSC Adv. 7 11745
Google Scholar
[45] Qu L H, Peng X G 2002 J. Am. Chem. Soc. 124 2049
Google Scholar
[46] Ren F M, Li S J, He C L 2015 Sci. China Mater. 58 490
Google Scholar
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