Photoluminescence resulting from semiconductor-metal solid solution observed in one-dimensional semiconductor nanostructures.
A narrow band photoluminescence (PL) emission peak resulting from CdS-Au solid solution was observed when growing one-dimensional nanostructures of CdS via the vapor-liquid-solid mechanism by using Au as the catalyst. This emission peak was located at 680 nm, a wavelength longer than the near band edge emission of CdS at 520 nm, and was shown not to be caused by the usual trap states of CdS which lead to a broad band emission. Here, the one-dimensional nanostructures of CdS were grown in a simple, low-temperature (360 degrees C) metal-organic chemical vapor deposition process with a single source precursor of CdS. Straight nanowires of diameter 50-70 nm and wormlike nanorods of diameter 100-200 nm were obtained. Both the upper and lower portions of the nanorods/nanowires possessed single crystallinity as judged from the corresponding high-resolution transmission electron microscopy images and selected area electron diffraction data. This work demonstrates the feasibility of adjusting PL emission peaks of optoelectronic semiconductors through alloying with metals.
Hsu
Yung-Jung
YJ
Lu
Shih-Yuan
SY
D019187:Cadmium Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D010777:Photochemistry; D012666:Semiconductors; D012996:Solutions / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry*; D013499:Surface Properties
D019187:Cadmium Compounds; D012996:Solutions; D013431:Sulfates; D006046:Gold; C037123:cadmium sulfate