Confinement in PbSe wires grown by rf magnetron sputtering

Hyeson Jung; Kuljic, Rade; Stroscio, Michael A.; Dutta, Mitra
April 2010
Applied Physics Letters;4/12/2010, Vol. 96 Issue 15, p153106
Academic Journal
Lead selenide (PbSe) nanowires were grown by magnetron sputtering on silicon with silicon dioxide (SiO2/Si) substrates, and characterized by scanning electron microscopy, x-ray diffraction, Fourier transform infrared spectroscopy, photoluminescence, and x-ray photoelectron spectroscopy. Closely packed PbSe nanowires of approximately 100 nm diameter grew in the <111> rock-salt cubic structure orientation. These large wires showed a large blueshift in the luminescence and absorption compared to the bulk crystal, demonstrating quantum confinement. This is attributed to a strong built-in field due to surface states, band bending, and a depletion layer which confines the carrier states.


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