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CdSeQDdielektrik - Interband and Intraband Optical Studies...

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Interband and Intraband Optical Studies of CdSe Colloidal Nanocrystal Films by Fumiaki Toyama B.A. Physics University of California, Berkeley, 2001 Submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Master of Science in Physics at the MASSACHUSETTS INSTITUTE OF TECHNOLOGY September 2004 © Massachusetts Institute of Technology 2004. All rights reserved. Author .... ........... . ............ Department of Physics September 1, 2004 Certified by ..... , ,.,,. ........................... Marc A. Kastner Donner Professor of Physics and Department Head Thesis Supervisor Accepted by ................... . ........ ... MASSA~ as Th J. Greytak OF TECHNOLOGs essor of Physics and Associate Department H,4 for Education SEP 1 4 200 LIBPARIES
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Interband and Intraband Optical Studies of CdSe Colloidal Nanocrystal Films by Fumiaki Toyama Submitted to the Department of Physics on September 1, 2004, in partial fulfillment of the requirements for the degree of Master of Science in Physics Abstract We present results for optical measurements on charged CdSe nanocrystals. The injection of electrons into quantum confined states is confirmed by monitoring changes in the visible and infrared absorption spectra. Interestingly, the response is observed only in the nanocrystals that have been chemically treated with sodium biphenyl. Bleaching of the visible interband transition is observed upon electron injection into the nanocrystal films. It is expect that, with injected electrons in the 1Sestate, more electrons are available to undergo the intraband transition and absorb more light in infrared region. However, the opposite effect is observed. The energy and cross section of the infrared absorption are consistent with a one-electron transition between the Se and 1Pe states confined in the quantum dots. Thesis Supervisor: Marc A. Kastner Title: Donner Professor of Physics and Department Head 3
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Acknowledgments I consider it a privilege to be given the opportunity to attend a great institution such as MIT and being able to work with the most talented and brightest people. For this I wish to thank the Department of physics. I would like to thank several people who made this research possible. First, my advisor Professor Marc Kastner guided me through this work with a lot of insight. He has a terrific ability to focus on the interesting physics of a system, and to describe it within a simple intuitive picture. When I approached Marc with the idea of doing a master thesis, he was extremely supportive and helped make a difficult decision for me easier and more rewarding. I am truly grateful for the opportunity to have completed this project. This research is an extension of Nicole Morgan and Marija Dmdic's work. I had the good fortune to work on a project in a new area, at the rapidly expanding intersection of two fields. These experiments would never have been possible without outstanding collaborators in Moungi Bawendi's group in the Chemistry Department. I would like to thank Venda Porter and Mirna Jarosz for always willing to provide terrific samples. I would also like to thank all my fellow group members especially Maria
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