Carrier delocalization in InAs/InGaAlAs/InP quantum‐dash‐based tunnel injection system for 1.55 μm emission

W. Rudno-Rudiński, M. Syperek, J. Andrzejewski, A. Maryński, J. Misiewicz, A. Somers, Sven Höfling, J. P. Reithmaier, G. Sęk

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10 Citations (Scopus)


We have investigated optical properties of hybrid two‐dimensional‐zero‐dimensional (2D‐0D) tunnel structures containing strongly elongated InAs/InP(001) quantum dots (called quantum dashes), emitting at 1.55 μm. These quantum dashes (QDashes) are separated by a 2.3 nm‐width barrier from
an InGaAs quantum well (QW), lattice matched to InP. We have tailored quantum‐mechanical coupling between the states confined in QDashes and a QW by changing the QW thickness. By combining modulation spectroscopy and photoluminescence excitation, we have determined the energies of all relevant optical transitions in the system and proven the carrier transfer from the QW
to the QDashes, which is the fundamental requirement for the tunnel injection scheme. A transformation between 0D and mixed‐type 2D‐0D character of an electron and a hole confinement in the ground state of the hybrid system have been probed by time‐resolved photoluminescence that revealed considerable changes in PL decay time with the QW width changes. The experimental
discoveries have been explained by band structure calculations in the framework of the eight‐band k⋅p model showing that they are driven by delocalization of the lowest energy hole state. The hole delocalization process from the 0D QDash confinement is unfavorable for optical devices based on such tunnel injection structures.
Original languageEnglish
Article number015117
Number of pages8
JournalAIP Advances
Issue number1
Early online date31 Jan 2017
Publication statusPublished - Jan 2017


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