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Chin. Phys. B, 2020, Vol. 29(3): 034206    DOI: 10.1088/1674-1056/ab6967

Evaluation of polarization field in InGaN/GaN multiple quantum well structures by using electroluminescence spectra shift

Ping Chen(陈平)1,2, De-Gang Zhao(赵德刚)1,2, De-Sheng Jiang(江德生)1, Jing Yang(杨静)1, Jian-Jun Zhu(朱建军)1,2, Zong-Shun Liu(刘宗顺)1, Wei Liu(刘炜)1, Feng Liang(梁锋)1, Shuang-Tao Liu(刘双韬)1, Yao Xing(邢瑶)1, Li-Qun Zhang(张立群)3
1 State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences(CAS), Beijing 100083, China;
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Key Laboratory of Nano-devices and Applications of CAS, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Abstract  In order to investigate the inherent polarization intensity in InGaN/GaN multiple quantum well (MQW) structures, the electroluminescence (EL) spectra of three samples with different GaN barrier thicknesses of 21.3 nm, 11.4 nm, and 6.5 nm are experimentally studied. All of the EL spectra present a similar blue-shift under the low-level current injection, and then turns to a red-shift tendency when the current increases to a specific value, which is defined as the turning point. The value of this turning point differs from one another for the three InGaN/GaN MQW samples. Sample A, which has the GaN barrier thickness of 21.3 nm, shows the highest current injection level at the turning point as well as the largest value of blue-shift. It indicates that sample A has the maximum intensity of the polarization field. The red-shift of the EL spectra results from the vertical electron leakage in InGaN/GaN MQWs and the corresponding self-heating effect under the high-level current injection. As a result, it is an effective approach to evaluate the polarization field in the InGaN/GaN MQW structures by using the injection current level at the turning point and the blue-shift of the EL spectra profiles.
Keywords:  InGaN/GaN multiple quantum well (MQW)      polarization field      electroluminescence spectra shift      electron leakage current  
Received:  18 November 2019      Revised:  16 December 2019      Accepted manuscript online: 
PACS:  42.55.Px (Semiconductor lasers; laser diodes)  
  73.21.Fg (Quantum wells)  
  78.60.Fi (Electroluminescence)  
Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2016YFB0400803 and 2016YFB0401801) and the National Natural Science Foundation of China (Grant Nos. 61674138, 61674139, 61604145, 61574135, and 61574134).
Corresponding Authors:  De-Gang Zhao     E-mail:

Cite this article: 

Ping Chen(陈平), De-Gang Zhao(赵德刚), De-Sheng Jiang(江德生), Jing Yang(杨静), Jian-Jun Zhu(朱建军), Zong-Shun Liu(刘宗顺), Wei Liu(刘炜), Feng Liang(梁锋), Shuang-Tao Liu(刘双韬), Yao Xing(邢瑶), Li-Qun Zhang(张立群) Evaluation of polarization field in InGaN/GaN multiple quantum well structures by using electroluminescence spectra shift 2020 Chin. Phys. B 29 034206

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