Lateral photocurrent spectroscopy on self-assembled PbSe quantum dots

摘要

Wavelength- and temperature-dependent lateral photocurrent measurements were performed on self-assembled PbSe/PbEuTe quantum-dot superlattices. The comparison of the measured data with absorption spectra calculated within the envelope function approach allows a clear identification of the different features in the photocurrent spectra. The photocurrent signal from the dots is observed over a wide temperature range and no quenching occurs even at 5 K. This indicates a type-Ⅱ band alignment for the strained PbSe/PbEuTe quantum-dots.