Effects of crystal shape on the energy levels of zero-dimensional PbS quantum dots.
Nanometer-size PbS quantum dots have been made by electrodeposition on a Au(111) substrate. The deposited nanocrystals have a flattened cubic shape. We probed the single-electron energy-level spectrum of individual quantum dots by scanning tunneling spectroscopy and found that it deviates strongly from that of spherical PbS quantum dots. The measured energy-level spectrum is successfully explained by considering strong confinement in a flattened cubic box.
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Debye Institute, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands.
Vanmaekelbergh
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Stoffels
E J A J
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Van Kempen
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