Wannier-Stark ladder spectra in In xGa 1−xAsGaAs strained layer piezo-electric superlattices

• Published in: Solid-state electronics Vol. 40; no. 1; pp. 167 - 170
• Main Authors: Peggs, D.W., Skolnick, M.S., Whittaker, D.M., Hogg, R.A., Willcox, A.R.K., Mowbray, D.J., Grey, R., Rees, G.J., Hart, L., Hopkinson, M., Hill, G., Pate, M.A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 1996
• ISSN: 0038-1101; 1879-2405
• DOI: 10.1016/0038-1101(95)00239-1

Wannier-Stark ladder transitions in the photocurrent spectra of (111)B In xGa 1−xAsGaAs strained layer superlattices are reported. Both vertical transitions in the same well and diagonal transitions between adjacent wells are observed. In contrast to (100) superlattices, the Wannier-Stark spectra are observed for both senses of applied bias relative to zero potential drop across the superlattice. The observed transition energies are found to be in good agreement with the predictions of exciton calculations. The piezo-electric field is deduced in a simple and direct way from analysis of the spectra as a function of bias.