Size dependence of band gap variation and electron-phonon coupling in ZnO Quantum Dots
碩士 === 國立交通大學 === 光電工程系所 === 93 === ZnO quantum dots were successfully synthesized by a simple sol-gel method. The average size of quantum dots can be tailored under several well-controlled methods which are solution concentration, heating rate and aging time. Size-dependent blue shifts of photolu...
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| Format: | Others |
| Language: | en_US |
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2005
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| Online Access: | http://ndltd.ncl.edu.tw/handle/38279412047885233166 |
| Summary: | 碩士 === 國立交通大學 === 光電工程系所 === 93 === ZnO quantum dots were successfully synthesized by a simple sol-gel method. The average size of quantum dots can be tailored under several well-controlled methods which are solution concentration, heating rate and aging time. Size-dependent blue shifts of photoluminescence and absorption spectra reveal the quantum confinement effect. The band gap enlargement is in agreement with the theoretical calculation based on the weak confinement of effective mass model. Furthermore, we observed increase of the size-dependent Stokes shift of the photoluminescence peak relative to the absorption onset as the particle size decreases. Finally, we observed the results that energy conservation was relaxed and electron-phonon coupling energy was decreasing with decreasing quantum dots size by Raman spectra.
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