文摘
Planar defects in compound (III鈥揤 and II鈥揤I) semiconductor nanowires (NWs), such as twin and stacking faults, are universally formed during the catalytic NW growth, and they detrimentally act as static disorders against coherent electron transport and light emissions. Here we report a simple synthetic route for planar-defect free II鈥揤I NWs by tunable alloying, i.e. Cd1鈥?i>xZnxTe NWs (0 鈮?x 鈮?1). It is discovered that the eutectic alloying of Cd and Zn in Au catalysts immediately alleviates interfacial instability during the catalytic growth by the surface energy minimization and forms homogeneous zinc blende crystals as opposed to unwanted zinc blende/wurtzite mixtures. As a direct consequence of the tunable alloying, we demonstrated that intrinsic energy band gap modulation in Cd1鈥?i>xZnxTe NWs can exploit the tunable spectral and temporal responses in light detection and emission in the full visible range.
Keywords:
Twin defects; stacking faults; II鈭扸I semiconductor; band-gap modulation