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(ZT)eng and (PF)eng as practical indicators for TE energy conversion efficiency and output power generation, respectively. (A) ΔT-dependent (ZT)eng and average-temperature-based (ZT)eff. Normalized efficiency by Eq. 2, normalized (ZT)eng, and normalized (ZT)eff for HH (B) and for SnSe (C). Output power densities of (D) HH and (E) SnSe with ΔT in a cubic-shaped TE leg. (F) ΔT-dependent (PF)eng of HH and SnSe at Tc = 100 °C showing the same tendency as the power density curves (Inset).
Figure 5. Normalized PEED from nitrogen-doped diamond films. The original theory is three-dimensional normal from Eq. 28 and convolved with the Gaussian instrument function. The theory without scattering has a much higher peak energy and broader distribution. Adding scatter by optical phonons leads to a closer fit to the experimental PEED. Reprinted with permission from Sun et al. (2011).
Figure 11. (A) Electrical circuit of thermionic energy converter with CNT yarn. (B) Optical image of CNT yarn heated to 1333 K by a DC current. Reprinted with permission from Liu et al. (2006).
Figure 12. Net energy exchange H leaving a tungsten tip at a variety of temperatures as a function of field-emission current. Reprinted with permission from Swanson et al. (1966).
Citation: McCarthy PT, Reifenberger RG and Fisher TS (2014) Thermionic and photo-excited electron emission for energy-conversion processes. Front. Energy Res. 2:54. doi: 10.3389/fenrg.2014.00054 2b1af7f3a8