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SM ISO690:2012 SIRKELI, Vadim; VATAVU, Sergiu; YILMAZOGLU, Oktay; KUPPERS, Franko; HARTNAGEL, Hans Ludwig. Quantum electron transport in nonpolar ZnMgO/ZnO structures. In: Materials Science and Condensed Matter Physics. Ediția a 9a, 2528 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, p. 329. 
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Materials Science and Condensed Matter Physics Ediția a 9a, 2018 

Conferința "International Conference on Materials Science and Condensed Matter Physics" Chișinău, Moldova, 2528 septembrie 2018  


CZU: 538.9+539.2+621.38  
Pag. 329329  


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Compact solidstate sources are key components of various terahertz applications. Among electronic devices, resonant tunneling diodes (RTDs) and quantum cascade structures are promising as one of the candidates for terahertz wave generation and amplification at room temperature [1]. The increasing of the output power of RTD devices at THz frequencies and increasing the operation frequency are crucial tasks. To solve these issues, IIVI compounds are considered as promising materials for highpower terahertz emitter devices due to the higher breakdown voltages and higher conduction band offset (CBO). In this paper, we report on a numerical study of the quantum electron transport in the nonpolar mplane ZnMgO/ZnO structures employing design scheme with twowell and three quantum barriers as shown in Fig. 1(a). This device consists of two ZnO quantum wells and three Zn0.85Mg0.15O quantum barriers with layer thicknesses starting from the left quantum barrier in nm are: 2.7/6.0/2.6/4.0. The temperature was varied from 100 K to 300 K. The cross section area of all investigated structures is 1 μm × 1 μm. The electronic quantum transport of nonpolar mplane ZnMgO/ZnO structures was investigated numerically within single band effective mass approximation using nextnano.MSB solver software. The details of the model used in this work can be found in Ref. [1]. The material parameters used were taken from Ref. [2]. Temperature dependence of current densityvoltage characteristics of nonpolar mplane ZnMgO/ZnO structures is shown in Fig. 1(b). It could be seen that the current densityvoltage characteristics show the clear resonance peaks and have the regions of negative differential resistance in temperature range from 100 to 300 K. At room temperature this resonant feature exhibits the maximum peak current density of ~ 3.5 kA/cm2 and the current density peaktovalley ratio of ~ 8.2. Using the smallsignal equivalent circuit model for a RTD device [1] we have estimated the maximum intrinsic frequency of oscillation fmax to be ~ 1.9 THz with a maximum of output power of ~ 70 nW at room temperature. 

