Direct Observation of Energy-Gap Scaling Law in CdSe Quantum Dots with Positrons

Journal Article · Mon Jul 01 00:00:00 EDT 2002 · Physical Review B

OSTI ID:912145

Denison, Arthur Blanchard; Weber, M H; Lynn, K G; Barbiellini, B; Sterne, P A

CdSe quantum dot samples with sizes in the range of 1.8–~6 nm in diameter were examined by positron annihilation spectroscopy. The results were compared to data obtained for single-crystal bulk CdSe. Evidence is provided that the positrons annihilate within the nanospheres. The annihilation line shape shows a smearing at the boundary of the Jones zone proportional to the widening of the band gap due to a reduction in the size of the quantum dots. The data confirm that the change in the band gap is inversely proportional to the square of the quantum dot diameter.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: DE-AC07-99ID-13727
• OSTI ID: 912145
• Report Number(s): INEEL/JOU-00-01407; TRN: US0800285
• Journal Information: Physical Review B, Vol. 66, Issue 4
• Country of Publication: United States
• Language: English

Related Subjects

99 - GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ANNIHILATION
ENERGY GAP
POSITRONS
QUANTUM DOTS
SCALING LAWS
SHAPE
SPECTROSCOPY
CdSe
positron annihilation spectroscopy
quantum dot