Discrete electroluminescence lines in sub-micron p-i-n resonant tunnelling diodes |
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Affiliation: | Department of Physics, University of Nottingham, Nottingham, NG7 2RD, UK |
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Abstract: | We have fabricated GaAs/AlAs p-i-n double barrier resonant tunnelling diodes with active lateral dimensions down to 0.25μn2 using optical lithography and wet etching. Many devices have been investigated and systematic variations in the quantum well emission have been observed as the device size is decreased. We observe a red shift of the quantum well recombination lines. In addition a new line is observed at lower energy in the spectra of the smallest devices. The quantum well luminescence efficiency is found to be constant down to the smallest device size. |
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