Influence of sub-bandgap illumination on electric field distribution at grain boundary in CdZnTe crystals

Chen Wei-Long; Guo Rong-Rong; Tong Yu-Shen; Liu Li-Li; Zhou Sheng-Lan; Lin Jin-Hai

doi:10.7498/aps.71.20220896

Abstract

Grain boundary is one of the main defects, limiting the large-area application of CdZnTe nuclear radiation imaging detectors. In order to explore the ways to improve the electric field distribution properties near grain boundary, the effect of sub-bandgap illumination on the electric field distribution in CdZnTe detector with grain boundary is studied by Silvaco TCAD simulation technique. The grain boundary potential barrier and electric field dead zone are found in simulation results that significantly affect the carrier transport process in CdZnTe detector. The electric field dead zone caused by the grain boundary disappears under the bias of sub-bandgap illumination. Thus the electric field distribution tends to be linear. Meanwhile, the effects of different wavelengths and intensities of sub-bandgap illumination on the electric field distribution at the grain boundary are also investigated. The results show that the electric field of CdZnTe is distorted by sub-bandgap illumination at an intensity lower than 1×10^–9 W/cm². In contrast, a flatter electric field distribution is achieved at a wavelength of 850 nm and an intensity of 1×10^–7 W/cm². The carriers can be transported by drifting, reducing the probability of being captured or recombined by defects during transport, thus improving the charge collection efficiency of the detector.In addition, the microscopic mechanism of the modulation of the electric field distribution by sub-bandgap illumination and the energy band model of CdZnTe crystal containing grain boundary are proposed. Owing to the existence of the grain boundary, two space charge regions are formed near the grain boundary. The energy band at the grain boundary is bent upward. Meanwhile, the metal-semiconductor contact forms a Schottky barrier, and the energy band near the electrode is bent upward. When the bias voltage is applied, the energy band structure of the CdZnTe tends to tilt from the cathode to the anode. The sub-bandgap illumination can lower the energy band barrier at the grain boundary and regulate the energy band on both sides of the grain boundary. It is believed that this discussion will also make some contributions to understanding of the effects of illumination and grain boundary in other types of optoelectronic devices, especially the applications of thin films in solar cells and detectors.

Keywords:

Authors and contacts

Fujian Provincial Key Laboratory of Optoelectronic Technology and Devices, School of Opto-electronic and Communication Engineering, Xiamen University of Technology, Xiamen 361024, China

Corresponding author: Guo Rong-Rong, guorr2020@163.com

Funds: Project supported by the Natural Science Foundation of Fujian Province, China (Grant No. 2020J05239) and the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 51702271).

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References

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Cited By

图 1 Au/CdZnTe/Au器件结构图

Figure 1. Au/CdZnTe/Au device structure schematic.

DownLoad: Full-Size Img PowerPoint

图 2 无偏压下有无光照的Au/CdZnTe/Au器件仿真结果　(a)电子浓度分布; (b)空间电荷分布; (c)电场分布; (d)Au/CdZnTe/Au能带结构图

Figure 2. Simulation results of Au/CdZnTe/Au device with and without illumination under unbiased voltage: (a) Electron concentration distribution; (b) space charge distribution; (c) electric field distribution; (d) energy band structure diagram of Au/CdZnTe/Au.

DownLoad: Full-Size Img PowerPoint

图 3 100 V偏压下有无光照的Au/CdZnTe/Au器件仿真结果　(a)电场分布; (b)空间电荷分布; (c)正空间电荷分布; (d) 深施主电离密度; (e) SRH模型^[36-37]

Figure 3. Simulation results of Au/CdZnTe/Au device with and without illumination under 100 V bias voltage: (a) Electric field distribution; (b) space charge distribution; (c) positive space charge distribution; (d) deep donor ionization density; (e) SRH model^[36-37]

DownLoad: Full-Size Img PowerPoint

图 4 100 V偏压下的Au/CdZnTe/Au器件仿真结果　(a)不同波长的亚禁带光照下电场分布; (b) 不同光强的亚禁带光照下电场分布

Figure 4. Simulation results of Au/CdZnTe/Au device under 100 V bias voltage: (a) Electric field distribution under sub-bandgap illumination with different wavelengths; (b) electric field distribution under sub-bandgap illumination with different intensities.

DownLoad: Full-Size Img PowerPoint

图 5 Au/CdZnTe/Au器件有无光照的能带模型　(a)无偏压下无光照能带模型; (b)无偏压下有光照能带模型 (c) 外加偏压下无光照能带模型(d)外加偏压下有光照能带模型

Figure 5. Energy band model of Au/CdZnTe/Au device with and without illumination: (a) Energy band model without illumination under unbiased voltage; (b) energy band model with illumination under unbiased voltage ;(c) energy band model without illumination under applied bias voltage; (d) energy band model with illumination under applied bias voltage.

DownLoad: Full-Size Img PowerPoint

表 1 CdZnTe晶体的基本参数^[35]

Table 1. Basic parameters of CdZnTe crystal^[35].

Parameters	Value	Parameters	Value
Band gap/eV	1.6	Dielectric constant	10.9
Conduction band density/cm^–3	9.14×10¹⁷	Optical recombination rate/(cm³·s^–1)	1.5×10^–10
Valence band density/cm^–3	5.19×10¹⁸	Electronic auger coefficient/(cm⁶·s^–1)	5×10^–30
Electron mobility/cm²/(V·s)	1000	Hole Auger coefficient/(cm⁶·s^–1)	1×10^–31
Hole mobility/cm²/(V·s)	100	Acceptor band tail state/(cm^–3·eV^–1)	7.5×10¹⁴
Donor band tail state/(cm^–3·eV^–1)	7.5×10¹⁴

DownLoad: CSV

表 2 CdZnTe晶体基体能级的基本信息^[21]

Table 2. Basic information of the energy levels in the CdZnTe crystal matrix^[21].

Level position /eV	Type	Density /cm^–3	Electron capture cross section/cm²	Hole capture cross section/cm²
E_V+0.86	Donor	5×10¹¹	3×10^–14	3×10^–15

DownLoad: CSV

表 3 CdZnTe晶体晶界能级的基本信息^[27-30]

Table 3. Basic information of energy levels in the grain boundary of CdZnTe crystal^[27-30]

Level position /eV	Type	Density /cm^–3	Electron capture cross section/cm²	Hole capture cross section/cm²
E_C– 0.10	Donor	1×10¹²	1.2×10^–15	1.2×10^–16
E_V+ 0.14	Acceptor	1×10¹²	2.5×10^–15	2.5×10^–16
E_V+ 0.75	Acceptor	5×10¹²	3×10^–14	3×10^–15

DownLoad: CSV

表 4 890 nm亚禁带光照参数^[31-34]

Table 4. Basic parameters of 890 nm sub-bandgap illumination^[31-34].

Wavelength/nm	Extinction coefficient k	Refractive index n	Absorption coefficient/cm^–1
890	1.417×10^–4	2.9196	10

DownLoad: CSV

表 5 不同波长的亚禁带光照参数^[31-34]

Table 5. Basic parameters of different wavelengths sub-bandgap illumination^[31-34].

Wavelength/nm	Extinction coefficient k	Refractive index/n	Absorption coefficient/cm^–1
850	2.707×10^–4	2.9511	40
890	1.417×10^–4	2.9196	10
940	3.540×10^–5	2.8796	5

DownLoad: CSV

[1]	Johns P M, Nino J C 2019 J. Appl. Phys. 126 40902 Google Scholar
[2]	Kathalingam A, Valanarasu S, Ramesh S, Kim H S, Kim H S 2021 Sol. Energy. 224 923 Google Scholar
[3]	李颖锐, 吴森, 郭玉, 席守智, 符旭, 查钢强, 介万奇 2019 红外与激光工程 48 1016001 Google Scholar Li Y R, Wu S, Guo Y, Xi S Z, Fu X, Zha G Q, Jie W Q 2019 Infrared Laser Eng. 48 1016001 Google Scholar
[4]	Abbene L, Principato F, Gerardi G, Buttacavoli A, Cascio D, Bettelli M, Amade N S, Seller P, Veale M, Fox O, Sawhney K, Zanettini S, Tomarchio E, Zappettini A 2020 J. Synchrotron Radiat. 27 319 Google Scholar
[5]	Gao X, Sun H, Yang D, Wangyang P, Zhang C, Zhu X 2020 Vacuum 183 109855 Google Scholar
[6]	Chu M, Terterian S, Ting D, Wang C C, Gurgenian H K, Mesropian S 2001 Appl. Phys. Lett. 79 2728 Google Scholar
[7]	Carvalho A, Tagantsev A K, Oberg S, Briddon P R, Setter N 2010 Phys. Rev. B 81 075215 Google Scholar
[8]	孙士文, 隋淞印, 何力, 周昌鹤, 虞慧娴, 徐超 2014 红外技术 36 588 Google Scholar Sun S W, Sui S Y, Li H E, Zhou C H, Yu H X, Xu C 2014 IR. Tech. 36 588 Google Scholar
[9]	Parker B H, Stahle C M, Roth D, Babu S, Tueller J 2001 Proc. SPIE. 4507 68 Google Scholar
[10]	Zeng D M, Jie W Q, Wang T, Zhou H 2009 J. Cryst. Growth 311 4414 Google Scholar
[11]	Markunas J K, Almeida L A, Jacobs R N, Pellegrino J, Qadri S B, Mahadik N, Sanghera J 2010 J. Electron. Mater 39 738 Google Scholar
[12]	Bolotnikov A E, Babalola S O, Camarda G S, et al. 2009 IEEE Trans. Nucl. Sci. 56 1775 Google Scholar
[13]	Li W, Tkaczyk J E, Andreini K W, Cui J, Zhang T, Williams Y, Harding K G, Chen H, Bindley G, Matyi R J 2009 IEEE Nuclear Science Symposium Conference Record Orlando, USA, October 24–November 1, 2009 p1658
[14]	Dong J P, Jie W Q, Yu J Y, Guo R R, Teichert C, Gradwohl K P, Zhang B B, Luo X X, Xi S Z, Xu Y D 2018 Chin. Phys. B. 27 117202 Google Scholar
[15]	Prokesch M, Szeles C 2010 US Patent 20100078558 A1
[16]	Ivanov V, Dorogov P, Loutchanski A 2011 International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications Ghent, Belgium, June 6–9, 2011 p1
[17]	Washington A L, Teague L C, Duff M C, Burger A, Groza M, Buliga V 2011 J. Appl. Phys 110 073708 Google Scholar
[18]	Sik O, Grmela L, Elhadidy H, et al. 2013 J. Instrum. 8 C06005 Google Scholar
[19]	Zhang Y Q, Fu L 2018 Mater. Sci. Forum 922 40 Google Scholar
[20]	Prokesch M, Szeles C 2007 Phys. Rev. B 75 245204 Google Scholar
[21]	Gul R, Roy U N, James R B 2017 J. Appl. Phys. 121 115701 Google Scholar
[22]	Zhou Y M, He Y G, Lu A X, Wan Q 2009 Chin. Phys. B 18 3966 Google Scholar
[23]	Kong H S, Lee C 1995 J. Appl. Phys. 78 6122 Google Scholar
[24]	Kumari K, Avasthi S 2017 IEEE 44th Photovoltaic Specialists Conference Washington, USA, June 25–30, 2017 p251
[25]	Hossain F M, Nishii J, Takagi S, Sugiharad T, Ohtomo A, Fukumura T, Koinuma H, Ohno H, Kawasaki M 2004 Phys. E 21 911 Google Scholar
[26]	Zhang A, Zhao X R, Duan L B, Liu J M, Zhao J L 2011 Chin. Phys. B 20 057201 Google Scholar
[27]	Kim K H, Na Y H, Park Y J, Jung T R, Kim S U, Hong J K 2004 IEEE Trans. Nucl. Sci. 51 3094 Google Scholar
[28]	Kim K H, Ahn S Y, An S Y, Hong J K, Yi Y, Kim S U 2007 Curr Appl. Phys. 7 296 Google Scholar
[29]	Wei S H, Zhang S B 2002 Phys. Rev. B 66 155211 Google Scholar
[30]	Hjelt K, Juvonen M, Tuomi T, Nenonen S, Eissler E E, Bavdaz M 1997 Phys. Status Solidi. 162 747 Google Scholar
[31]	Cola A, Farella I 2013 Sensors 13 9414 Google Scholar
[32]	Cola A, Farella I, Anni M, Martucci M C 2012 IEEE Trans. Nucl. Sci 59 1569 Google Scholar
[33]	Montmorillon L A D, Delaye P, Launay J C, Roosen G 1995 Opt. Mater. 4 233 Google Scholar
[34]	Marple D T F 1964 J. Appl. Phys. 35 539 Google Scholar
[35]	Schlesinger T E, Toney J E, Yoon H, Lee E Y, Brunett B A, Franks L, James R B 2001 Mater. Sci. Eng. R 32 103 Google Scholar
[36]	Hsieh Y K, Card H C 1989 J. Appl. Phys. 65 2409 Google Scholar
[37]	Keevers M J, Green M A 1994 J. Appl. Phys. 75 4022 Google Scholar
[38]	徐凌燕 2014 博士学位论文 (西安: 西北工业大学) Xu L Y 2014 Ph. D. Dissertation (Xian: Northwestern Polytechnical University)

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