Extremely Efficient Multiple Electron-Hole Pair Generation in Carbon Nanotube Photodiodes
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- 11 September 2009
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 325 (5946) , 1367-1371
- https://doi.org/10.1126/science.1176112
Abstract
We observed highly efficient generation of electron-hole pairs due to impact excitation in single-walled carbon nanotube p-n junction photodiodes. Optical excitation into the second electronic subband E22 leads to striking photocurrent steps in the device I-VSD characteristics that occur at voltage intervals of the band-gap energy EGAP/e. Spatially and spectrally resolved photocurrent combined with temperature-dependent studies suggest that these steps result from efficient generation of multiple electron-hole pairs from a single hot E22 carrier. This process is both of fundamental interest and relevant for applications in future ultra-efficient photovoltaic devices.Keywords
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