Figure 8

(a) Figure of merit ZT as a function of chemical energy demonstrated for an isotope doped device of length 212.86 nm with and without additional vacancies 3i. (b) ZT max as a function of the device length, except for the black lines corresponding to isotopes only, other curves refer to of the combined effects of 70% isotope doping plus 2% 3i vacancies, the symbols are numerical data and the solid lines are the fitting curves. Data provided for M = 5 nanoribbons.