An advanced theoretical approach to study super-multiperiod superlattices:theory vs experiments  

作　　者：Alexander Sergeevich Dashkov Semyon Andreevich Khakhulin Dmitrii Alekseevich Shapran Gennadii Fedorovich Glinskii Nikita Andreevich Kostromin Alexander Leonidovich Vasiliev Sergey Nikolayevich Yakunin Oleg Sergeevich Komkov Evgeniy Viktorovich Pirogov Maxim Sergeevich Sobolev Leonid Ivanovich Goray Alexei Dmitrievich Bouravleuv 

机构地区：[1]Saint-Petersburg Electrotechnical University"LETI",Saint Petersburg,197022,Russian Federation [2]Alferov Saint-Petersburg National Research Academic University of the Russian Academy of Sciences,Saint Petersburg,194021,RussiaFne deration [3]Saint Petersburg Polytechnic University of Peter the Great,Saint Petersburg,195251,Russian Federation [4]Shubnikov Institute of Crystallography of Federal Scientific Research Centre“Crystallography and Photonics”,Russian Academy of Sciences,Moscow,119333,Russian Federation [5]National Research Center‘Kurchatov Institute’,Moscow,123182,Russian Federation [6]University associated with IA EAEC,Saint Petersburg,194044,Russian Federation [7]Institute for Analytical Instrumentation,Saint Petersburg,198095,Russian Federation [8]Ioffe Institute,Saint Petersburg,194021,Russian Federation

出　　处：《Journal of Semiconductors》2024年第2期57-66,共10页半导体学报（英文版）

基　　金：The work was supported by the Ministry of Education and Science of the Russian Federation in the framework of experimental research(Nos.075-01438-22-06 and FSEE-2022-0018);the Russian Science Foundation in theoretical research(No.RSF 23-29-00216).

摘　　要：A new theoretical method to study super-multiperiod superlattices has been developed.The method combines the precision of the 8-band kp-method with the flexibility of the shooting method and the Monte Carlo approach.This method was applied to examine the finest quality samples of super-multiperiod Al_(0.3)Ga_(0.7)As/GaAs superlattices grown by molecular beam epitaxy.The express photoreflectance spectroscopy method was utilized to validate the proposed theoretical method.For the first time,the accurate theoretical analysis of the energy band diagram of super-multiperiod superlattices with experimental verification has been conducted.The proposed approach highly accurately determines transition peak positions and enables the calculation of the energy band diagram,transition energies,relaxation rates,and gain estimation.It has achieved a remarkably low 5%error compared to the commonly used method,which typically results in a 25%error,and allowed to recover the superlattice parameters.The retrieved intrinsic parameters of the samples aligned with XRD data and growth parameters.The proposed method also accurately predicted the escape of the second energy level for quantum well thicknesses less than 5 nm,as was observed in photoreflectance experiments.The new designs of THz light-emitting devices operating at room temperature were suggested by the developed method.

关 键 词：super-multiperiod superlattice photoreflectance spectroscopy Kane model kp-method energy band diagram light amplifiers 

分 类 号：TN304[电子电信—物理电子学]