Photoluminescence of the Beryllium Acceptor at the Centre of Quantum Wells

  • School of Space Science and Physics,Shandong University at Weihai,Weihai 264209,China
  • School of Space Science and Physics,Shandong University at Weihai,Weihai 264209,China
  • School of Space Science and Physics,Shandong University at Weihai,Weihai 264209,China
  • School of Space Science and Physics,Shandong University at Weihai,Weihai 264209,China
  • School of Space Science and Physics,Shandong University at Weihai,Weihai 264209,China

Key words: quantum confined acceptorsδ-dopedmultiple quantum wellsphotoluminescence

Abstract: We report photoluminescence studies of internal transitions of shallow Be acceptors in bulk GaAs and a series of δ-doped GaAs/AlAs multiple quantum well samples with well width ranging from 3 to 20nm.A series of Be δ-doped GaAs/AlAs multiple-quantum wells with the doping at the well center and a single epilayer of GaAs uniformly Be doped were grown by molecular beam epitaxy.The photoluminescence spectra were measured at 4,20,40,80,and 120K,respectively.A two-hole transition of the acceptor-bound exciton from the ground state,1S3/2(Γ6),to the first-excited state,2S3/2(Γ6) ,has been clearly observed.A variational principle is presented to obtain the 2s-1s transition energies of quantum confined Be acceptors as a function of the well width under the single-band effective mass and envelop function approximations.It is found that the acceptor transition energy increases with decreasing quantum-well width,and the experimental results agree well with the theoretical calculation.

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