Extremely efficient multiple electron-hole pair generation in carbon nanotube photodiodes.

نویسندگان

  • Nathaniel M Gabor
  • Zhaohui Zhong
  • Ken Bosnick
  • Jiwoong Park
  • Paul L McEuen
چکیده

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-V(SD) characteristics that occur at voltage intervals of the band-gap energy E(GAP)/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.

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عنوان ژورنال:
  • Science

دوره 325 5946  شماره 

صفحات  -

تاریخ انتشار 2009