Negative corona charge

Fig. 6.2 Schematic depiction of the light-induced discharge process for a negatively corona-charged dual-layer photoreceptor. CGL and CTL denote the charge generation layer and the charge transport layer, respectively.

The present paper reports the results of investigations on the low paessure effect on the behaviour of corona charged PP electrets. The PP films are charged in a positive or a negative corona at different charging temperatures T=20°C and T=90°C. In the vacuum chamber some electrets were stored between two plate shorted electrodes with various air gaps and the other ones were put only onto a metal electrode. The time and temp>erature dependences of the surface potential of electrets were also studied. 

Fig. 12. Temperature surface potential decay curves after negative corona charge.

Figure 15 showed Fig.l4 in a mass. It is revealed that clear saturation hapvpens in surface potential by the negative corona charge. On the other hand, for positive corona charge, the surface potential shows linear charging characteristics to ca.lkV of the grid voltage. 

Fig. 24. TSC spectrum separation result of the negative corona charge of the PP2 film.

Figure 25-27 are the result that separated a TSC spectrum of three kinds of PP film. In Fig. 25(a) are negative corona charge. Fig. 25(b) are positive corona charge. The residual current Cr after the separation spreads and displays it. 

The negative corona charge TSC spectrum was separated at the peaks from Pi to Pe. Actual survey TSC spectrum Ci deducts 2nd run TSC and removes the increase current of high temperature region. Ps peak accords with the high temperature side of the maximum peak of the Cl curve well, but understand that Ci curve is distorted in the low temperature side. Because the low temperature side of the Ci curve accords with a temperature region of inversion current observed in 2nd run TSC, it is considered as influence. The Pe peak to show in attached map is a separation result of the 2nd run TSC. 

Then, a result of the PP2 film is shown in the Fig. 26. In the case of negative corona charge, we already showed it at a point of the explanation of the separation process of Chaper 5. For the positive corona charge, the Ci curve was separated at three peaks from Pi to Ps-The P3 peak is the reconstruction of the TSC spectrum from the actual survey Ci spectrum only for the initial rising part that it explained by AEM-u theory. 

Finally Fig. 27 is a separation result of PP3 film. In the 2nd run TSC, the main peaks less than 400 K are cleaned. In negative and positive corona charge, it was divided into the TSC spectrum from three traps. The P3 peak of the positive corona charge is inversion TSC separated by 2nd run TSC (C12 curve). In attached map of Fig.27(b), the enlarged figure of separation result less than 350K is shown. The Cr curve is a result expect the TSC signal. 

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