کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10618716 988184 2005 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Excitons in semiconducting single-walled carbon nanotubes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Excitons in semiconducting single-walled carbon nanotubes
چکیده انگلیسی
We report correlated-electron calculations of optically excited states in 10 semiconducting single-walled carbon nanotubes with a wide range of diameters. Optical excitation occurs to excitons whose binding energies decrease with the increasing nanotube diameter, and are smaller than the binding energy of an isolated strand of poly-(paraphenylene vinylene). The ratio of the energy of the second optical exciton polarized along the nanotube axis to that of the lowest exciton is smaller than the value predicted within single-particle theory. The experimentally observed weak photoluminescence is an intrinsic feature of semiconducting nanotubes, and is consequence of dipole-forbidden excitons occurring below the optical exciton. Excited states absorption calculations show photoinduced absorption energies are lower than or comparable to the binding energy of the lowest exciton.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 155, Issue 2, 15 November 2005, Pages 250-253
نویسندگان
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