2 Overall performance
Here, x ‘s the distance out of an electron travels into the an electronic industry in advance of striking people gas molecules; e ‘s the charges of an enthusiastic electron, step 1.6 ? ten ?19 C; E ‘s the electronic field-strength. Always i utilize the suggest 100 % free street, ?, instead of x to choose whether the dysfunction will come or not. Thus, with similar electric field-strength, reducing the suggest 100 % free path of electrons can inhibits the latest description impact.
Figure 1b shows the relationship between Vb and the distance d of the air gap and gas pressure p, simultaneously. Obviously, with the increase of pressure the breakdown voltage improves. Especially when d is larger, the enhancement of Vb is more obvious. Besides the breakdown voltage, the threshold charge density of TENG is also influenced by gas pressure, as determined by the breakdown effect in the short-circuit condition. [ 11 ] These two threshold values together confine Eem in the V–Q plot, which determines the maximized output energy density, [ 9, 10 ] as demonstrated in Figure 1c,d.