Laser-induced self-organization of nano-wires on SiO2/Si interface
Original observation of new graded band gap structures formed on the surface of elementary Si semiconductor at studying the optical properties of Si nano-hills formed at the SiO2/Si interface by pulsed Nd:YAG laser irradiation is reported. The self-organized nano-hills on Si surface are characterized by a strong photoluminescence in the visible range of spectrum with a shoulder extended to the long-wave part of the spectrum. The feature is explained by the quantum confinement effect in nano-hillsnano-wires of gradually changing diameter.
sio2/si nano-hills photoluminescence graded band gap si laser radiation afm