Size-dependent tunneling and optical spectroscopy of CdSe quantum rods.
Photoluminescence excitation spectroscopy and scanning-tunneling spectroscopy are used to study the electronic states in CdSe quantum rods that manifest a transition from a zero-dimensional to a one-dimensional quantum-confined structure. Both optical and tunneling spectra show that the level structure depends primarily on the diameter of the rod and not its length. With increasing diameter, the band gap and the excited state level spacings shift to the red. The level structure was assigned using a multiband effective-mass model, showing a similar dependence on rod dimensions.
Racah Institute of Physics, and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel. kushmerick@nrl.navy.mil
David
D
Katz
Tommer
T
Wizansky
Oded
O
Millo
Eli
E
Rothenberg
Taleb
T
Mokari
Uri
U
Banin
D002104:Cadmium / Q000737:chemistry*; D005456:Fluorescent Dyes; D049449:Luminescence; D012643:Selenium / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods
D005456:Fluorescent Dyes; D002104:Cadmium; D012643:Selenium