Electroluminescence behavior of ZnO/Si heterojunctions: Energy band alignment and interfacial microstructure
| العنوان: | Electroluminescence behavior of ZnO/Si heterojunctions: Energy band alignment and interfacial microstructure |
|---|---|
| المؤلفون: | Zhaoyi Yin, J. Ying, Qiongqiong Zhu, Paul K. Chu, Hairen Tan, Jingbi You, Xingwang Zhang, Shuai Zhang |
| المصدر: | Journal of Applied Physics. 107:083701 |
| بيانات النشر: | AIP Publishing, 2010. |
| سنة النشر: | 2010 |
| مصطلحات موضوعية: | Materials science, business.industry, General Physics and Astronomy, Heterojunction, Electroluminescence, law.invention, Tunnel effect, X-ray photoelectron spectroscopy, law, Optoelectronics, Rectangular potential barrier, Charge carrier, Electronic band structure, business, Light-emitting diode |
| الوصف: | n-ZnO/p-Si heterojunction light-emitting diodes (LEDs) show weak defect-related electroluminescence (EL). In order to analyze the origin of the weak EL, the energy band alignment and interfacial microstructure of ZnO/Si heterojunction are investigated by x-ray photoelectron spectroscopy. The valence band offset (VBO) is determined to be 3.15 +/- 0.15 eV and conduction band offset is -0.90 +/- 0.15 eV, showing a type-II band alignment. The higher VBO means a high potential barrier for holes injected from Si into ZnO, and hence, charge carrier recombination takes place mainly on the Si side rather than the ZnO layer. It is also found that a 2.1 nm thick SiOx interfacial layer is formed at the ZnO/Si interface. The unavoidable SiOx interfacial layer provides to a large number of nonradiative centers at the ZnO/Si interface and gives rise to poor crystallinity in the ZnO films. The weak EL from the n-ZnO/p-Si LEDs can be ascribed to the high ZnO/Si VBO and existence of the SiOx interfacial layer. |
| تدمد: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.3385384 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::8c570cfa28b57104f4361bc500fa8180 https://doi.org/10.1063/1.3385384 |
| رقم الانضمام: | edsair.doi...........8c570cfa28b57104f4361bc500fa8180 |
| قاعدة البيانات: | OpenAIRE |
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