Motivation
ZnO nanowires were obtained through a vapor transport route at temperatures as low as around 250 ”ĘC. The investigation of the growth mechanism suggests that BiI3 plays a key role on the fabrication of ZnO nanowires. Electrical transport of Bi-doped ZnO nanowires shows n-type semiconducting behavior with a carrier concentration of and an electron mobility of . The carrier concentration is one order of magnitude larger than that of undoped ZnO nanowires, indicating that Bi acts as donor rather than the usual acceptor in ZnO films. The low mobility may be in association with electron scatterings at the boundaries from small size effect of nanowires. Near band edge emission in photoluminescence spectrum of Bi?ZnO nanowires is redshifted relative to undoped ZnO nanorods as a result of enhanced carrier concentration. The donor-acceptor pair transition associated with Bi was also observed at 3.241 eV.