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Przeździecka, Ewa, 2026, "Eu-assisted enhancement of photoresponse in MBE-grown CdO/Si photodetectors", https://doi.org/10.18150/9GBJDC, RepOD, V1
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Doping cadmium oxide with rare earth (RE) elements is a way to control the band gap and enhance carrier concentration and mobility. In this work, we decided to use one of REs, europium, and verify how it impacts performance of CdO/Si diode. The samples were grown using plasma-assisted molecular beam epitaxy. Doping level was modified by changing the temperature of the effusion cell with Eu and therefore flux of Eu particles. Different dopant concentrations were confirmed by secondary ion mass spectrometry. Atomic force microscopy images revealed a grain-like surface structure of the samples with grain size increasing after rapid thermal processing (RTP). Raman spectroscopy showed that introducing Eu changes vibrational properties of CdO through intraionic anharmonicity reduction. Kelvin probe method revealed upward band bending caused by oxygen adsorption during RTP. Electrical measurements confirmed that rectifying junctions were manufactured and that they are able to produce photocurrent in the spectral range of 450-1150 nm without external voltage bias. Introducing Eu into CdO was found to increase e.g. rectifying factor, fill factor and measured photocurrent. The results show that doping CdO with Eu is a way to enhance performance of the presented zero-power-consumption photodetectors, making it a promising material for future applications in optoelectronics.
Raman, p-n junction, detection, Epitaksja z wiązek molekularnych, Raman, badania elektryczne
Eu-assisted enhancement of photoresponse in MBE-grown CdO/Si photodetectors Igor Perlikowski , Eunika Zielony , Abinash Adhikari , Rafał Jakieła , Sergij Chusnutdinow , Ewa Popko , Ewa Przeździecka Materials Science and Engineering: B Volume 325, March 2026, 119113 doi: https://doi.org/10.1016/j.mseb.2025.119113
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