Effects of p-layer hole concentration and thickness on performance of p-i-n InGaN homojunction solar cells

Pan Hong-Ying; Quan Zhi-Jue

doi:10.7498/aps.68.20191042

Abstract

In this paper, the effects of p-layer hole concentration and p-layer thickness on the performances of InGaN p-i-n homojunction solar cells with different indium components and their intrinsic mechanisms are investigated by numerical simulations. it is found that the conversion efficiency of solar cells first increases and then decreases slightly with the increase of p-layer hole concentration and p-layer thickness. Moreover, the change of p-layer hole concentration and p-layer thickness will cause great changes of the conversion efficiency of the solar cells, especially as the indium composition increases. In order to better clarify and understand the physical mechanism of this phenomenon, the collection efficiency, I-V characteristic, built-in electric field and carrier transport of solar cells are analyzed in this paper. When the hole concentration is insufficient, the build-in electric filed is not strong enough to separate the most of the electric-hole pairs. This will reduce the collection efficiency. In addition, the lower the hole concentration, the higher the series resistance of solar cells will be and the more the power loss. So a conclusion can be drawn that the lower hole concentration of p-layer would be accompanied by the reduction of collection efficiency and the increase of series resistance, thus resulting in a lower conversion efficiency. With the increase of the hole concentration which is below an optimal value, the built-in electric field reaches the threshold, which can improve the collection efficiency. At the same time, although the series resistance is reduced to a certain extent, it still reduces the effective output power and limits the conversion efficiency. When the hole concentration is higher than the optimal value, the carrier mobility becomes the main factor limiting the conversion efficiency. As for the p-layer thickness, the simulation results indicate that the lateral transport of carriers from the p-layer to the anode electrodes becomes more obstructive with the thinning of p-layer thickness. This is because when the p-layer thickness decreases, thus causing the p-layer sectional area to decrease, the lateral series resistance becomes higher. It is clear that when the p-layer is too thin, the lateral series resistance is one of the main limiting factors affecting the conversion efficiency of solar cells.

Keywords:

Authors and contacts

National Institute of LED on Si Substrate, Nanchang University, Nanchang 330047, China

Corresponding author: Quan Zhi-Jue, quanzhijue@ncu.edu.cn

Funds: project supported by the National Natural Science Foundation of China (Grant No. 11674147) and the Key Research and Development Plan of Jiangxi Province, China (Grant No. 20171BBE50052)

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References

[1]	Jain S C, Willander M, Narayan J, Overstraeten R V 2000 J. Appl. Phys. 87 965 Google Scholar
[2]	Ambacher O 1998 J. Phys. D 31 2653 Google Scholar
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图 1 In_xGa_1–xN p-i-n同质结太阳电池结构示意图y是距离p层表面的位置, y = 0代表p层表面

Figure 1. Schematic of In_xGa_1–xN p-i-n homojunction solar cells. y is the position measured from the p-layer surface and y = 0 represents the p-layer surface.

DownLoad: Full-Size Img PowerPoint

图 2 In_0.2Ga_0.8N, In_0.4Ga_0.6N和In_0.6Ga_0.4N p-i-n同质结电池中, (a)转换效率和(b)收集效率随p层空穴浓度N_A⁺的关系

Figure 2. (a) Conversion efficiencies and (b) collection efficiencies with various N_A⁺ for In_0.2Ga_0.8N, In_0.4Ga_0.6N, In_0.6Ga_0.4N p-i-n homojunction solar cells, respectively.

DownLoad: Full-Size Img PowerPoint

图 3 (a) In_0.2Ga_0.8N, (c) In_0.4Ga_0.6N和(e) In_0.6Ga_0.4N p-i-n同质结在零偏压及光照下, 不同空穴浓度(N_A⁺)下的内建电场; (b) In_0.2Ga_0.8N, (d) In_0.4Ga_0.6N和(f) In_0.6Ga_0.4N p-i-n同质结在不同空穴浓度(N_A⁺)下的I-V曲线

Figure 3. Under AM1.5 illumination and zero bias, electric-field of (a) In_0.2Ga_0.8N, (c) In_0.4Ga_0.6N and (e) In_0.6Ga_0.4N p-i-n homojunction solar cells with various hole concentration (N_A⁺); I-V curves of (b) In_0.2Ga_0.8N, (d) In_0.4Ga_0.6N and (f) In_0.6Ga_0.4N p-i-n homojunction solar cells with various hole concentration (N_A⁺), respectively.

DownLoad: Full-Size Img PowerPoint

图 4 In_0.2Ga_0.8N, In_0.4Ga_0.6N和In_0.6Ga_0.4N p-i-n同质结电池中, (a)转换效率和(b)收集效率随p层厚度的变化

Figure 4. (a) Conversion efficiency and (b) collection efficiency versus p-layer thickness for In_0.2Ga_0.8N, In_0.4Ga_0.6N and In_0.6Ga_0.4N p-i-n homojunction solar cells, respectively.

DownLoad: Full-Size Img PowerPoint

图 5 不同表面复合速度下, In_0.6Ga_0.4N p-i-n同质结太阳电池在不同p层厚度下的(a)短路电流密度(J_sc)和(b)转换效率

Figure 5. (a) Short current density (J_sc) and (b) conversion efficiency of In_0.6Ga_0.4N p-i-n homojunction solar cells with various p-layer thickness at different surface recombination velocities.

DownLoad: Full-Size Img PowerPoint

图 6 (a) In_0.2Ga_0.8N, In_0.4Ga_0.6N和In_0.6Ga_0.4N p-i-n同质结电池在不同p层厚度下的I-V曲线; (b)不同p层厚度下In_0.6Ga_0.4N p-i-n同质结电池p层的横向电阻

Figure 6. (a) I-V curves of In_0.2Ga_0.8N, In_0.4Ga_0.6N and In_0.6Ga_0.4N p-i-n homojunction solar cells with various p-layer thickness and (b) the lateral resistance of p-layer for In_0.6Ga_0.4N p-i-n homojunction solar cells.

DownLoad: Full-Size Img PowerPoint

表 1 In_xGa_1–xN p-i-n同质结器件中的基准参数

Table 1. Parameters of baseline for In_xGa_1–xN p-i-n homojunction solar cells.

参数	基准值
铟组分/%	20, 40, 60
少子寿命/ns	1
p层掺杂激活浓度/cm^–3	5 × 10¹⁷
i层掺杂浓度/cm^–3	1 ×10¹⁷
n层掺杂浓度/cm^–3	5 × 10¹⁷
p层厚度/μm	0.2
i层厚度/μm	0.4
n层厚度μm	2
表面复合速度/cm·s^–1	1 ×10⁴

DownLoad: CSV

[1]	Jain S C, Willander M, Narayan J, Overstraeten R V 2000 J. Appl. Phys. 87 965 Google Scholar
[2]	Ambacher O 1998 J. Phys. D 31 2653 Google Scholar
[3]	Strite S T, Morkoc H 1998 JVST B 10 1237 Google Scholar
[4]	Mohammad S N, Morkoç H 1996 Prog. Quant. Electron. 20 361 Google Scholar
[5]	Wang H L, Zhang X H, Wang H X, Li B, Chen C, Li Y X, Yan H, Wu Z S, Jiang H 2018 Chin. Phys. B 27 127805 Google Scholar
[6]	Wu J, Walukiewicz W, Yu K M, Iii J W A, Haller E E, Hai L, Schaff W J, Saito Y, Nanishi Y 2002 Appl. Phys. Lett. 80 3967 Google Scholar
[7]	Bhuiyan A G, Sugita K, Hashimoto A, Yamamoto A 2012 IEEE J. Photovolt. 2 276 Google Scholar
[8]	Muth J F, Lee J H, Shmagin I K, Kolbas R M, Casey H C, Keller B P, Mishra U K, Denbaars S P 1997 Appl. Phys. Lett. 71 2572 Google Scholar
[9]	Nanishi Y, Saito Y, Yamaguchi T 2003 Jpn. J. Appl. Phys. 42 2549 Google Scholar
[10]	Wu Y, Sun X J, Jia Y P, Li D B 2018 Chin. Phys. B 27 126101 Google Scholar
[11]	Tran B T, Chang E Y, Trinh H D, Lee C T, Sahoo K C, Lin K L, Huang M C, Yu H W, Luong T T, Chung C C 2012 Sol. Energy Mater. Sol. Cells 102 208 Google Scholar
[12]	Wu J, Walukiewicz W, Yu K M, Shan W, Ager J W, Haller E E, Hai L, Schaff W J, Metzger W K, Kurtz S 2003 J. Appl. Phys. 94 6477 Google Scholar
[13]	Fabien C A M, Moseley M, Gunning B, Doolittle W A, Ponce F A 2014 IEEE J. Photovolt. 4 601 Google Scholar
[14]	Cai X M, Zeng S W, Zhang B P 2009 Appl. Phys. Lett. 95 183516 Google Scholar
[15]	Islam M R, Kaysir M R, Islam M J, Hashimoto A, Yamamoto A 2013 J. Mater. Sci. Technol. 29 128 Google Scholar
[16]	Shim J P, Choe M, Jeon S R, Seo D, Lee T, Lee D S 2011 Appl. Phys. Express 4 1166 Google Scholar
[17]	Chen X, Matthews K D, Hao D, Schaff W J, Eastman L F 2008 Phys. Status Solidi 205 1103 Google Scholar
[18]	Feng S W, Lai C M, Chen C H, Sun W C, Tu L W 2010 J. Appl. Phys. 108 093118 Google Scholar
[19]	Wu S, Cheng L, Wang Q 2018 Superlattice Microst. 119 9 Google Scholar
[20]	周梅, 赵德刚 2015 发光学报 36 534 Google Scholar Zhou M, Zhao D G 2015 Chin. J. Lumin. 36 534 Google Scholar
[21]	Benmoussa D, Hassane B, Abderrachid H 2013 International Renewable and Sustainable Energy Conference (IRSEC) Ouarzazate, Morocco, March 7−9, 2013 p23
[22]	Mesrane A, Rahmoune F, Mahrane A, Oulebsir A 2015 Int. J. Photoenergy 2015 1 Google Scholar
[23]	Holec D, Costa P M F J, Kappers M J, Humphreys C J 2007 J. Cryst. Growth 303 314 Google Scholar
[24]	Michael S, Bates A, Green M 2005 Conference Record of the Thirty-first IEEE Photovoltaic Specialists Conference 2005 Lake Buena Vista, FL, USA, Jan. 3－7, 2005 p719
[25]	Fischer S, Wetzel C, Haller E E, Meyer B K 1995 Appl. Phys. Lett. 67 1298 Google Scholar
[26]	Bhattacharyya A, Li W, Cabalu J, Moustakas T D, Smith D J, Hervig R L 2004 Appl. Phys. Lett. 85 4956 Google Scholar
[27]	Chao L, Ren Z, Xin C, Zhao B, Wang X, Yin Y, Li S 2014 IEEE Photono. Tchnol. Lett. 26 134 Google Scholar
[28]	Fabien C A M, Doolittle W A 2014 Sol. Energy Mater. Sol. Cells 130 354 Google Scholar
[29]	Shen Y C, Mueller G O, Watanabe S, Gardner N F, Krames M R 2007 Appl. Phys. Lett. 91 2 Google Scholar
[30]	Chang J Y, Yen S H, Chang Y A, Kuo Y K 2013 IEEE J. Quantum Electron. 49 17 Google Scholar
[31]	Wu J, Walukiewicz W 2003 Superlattice Microst. 34 63 Google Scholar
[32]	Wu J, Walukiewicz W, Yu K M, Ager J W, Haller E E, Lu H, Schaff W J 2002 Appl. Phys. Lett. 80 4741 Google Scholar
[33]	Walukiewicz W, Iii J W A, Yu K M, Liliental-Weber Z, Wu J, Li S X, Jones R E, Denlinger J D 2006 J. Phys. D: Appl. Phys. 39 119 Google Scholar
[34]	Brown G F, Iii J W A, Walukiewicz W, Wu J 2010 Sol. Energy Mater. Sol. Cells 94 478 Google Scholar
[35]	Kuo Y K, Chang J Y, Shih Y H 2012 IEEE J. Quantum Electron. 48 367 Google Scholar
[36]	Brown G F, Ager J W, Walukiewicz W, Schaff W J, Wu J 2008 Appl. Phys. Lett. 93 6477 Google Scholar
[37]	King P D C, Veal T D, Jefferson P H, Mcconville C F, Lu H, Schaff W J 2007 Phys. Rev. B 75 115312 Google Scholar
[38]	Neufeld C J, Toledo N G, Cruz S C, Iza M, Denbaars S P, Mishra U K 2008 Appl. Phys. Lett. 93 1571 Google Scholar

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