By S.C. Jain, M. Willander and V. Kumar (Eds.)
Carrying out polymers have been came across in Nineteen Seventies in Japan. when you consider that this discovery, there was a gentle movement of recent principles, new figuring out, new conducing polymer (organics) buildings and units with more desirable functionality. numerous breakthroughs were made within the layout and fabrication expertise of the natural units. just about all houses, mechanical, electric, and optical, are vital in organics. This publication describes the new advances in those natural fabrics and units
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Additional resources for Conducting Organic Materials and Devices
Several interesting features predicted by this equation are given below. 48 Conducting Organic Materials and Devices 1. For small applied voltage γ is positive and the slope of the ln J –1/T plots is negative. For sufficiently high applied voltage V , γ becomes negative and the slopes, positive. The change-over takes place at applied voltage V = Vc given by, Vc = qHb d 2 . 55) At V = Vc the effective activation energy is zero. 2. The ln J versus ln V plots measured at different temperatures also show interesting features.
The experimental data agrees with Ohm’s law upto the point shown by B. This ohmic behavior of the J –V characteristics at low voltages is due to existing background doping or thermally generated carriers. The ohmic region is followed by transition to the space charge limited current (SCLC) and the SCLC follows the V l+1 law, characteristics of exponential trap distribution. 46). Dashed line ADC is the plot of old theory given by Eq. 42). The two theories agree upto the point D and the experimental data is in good agreement with both the theories between the points E and D.
Comparison of the mobility model with the low temperature data is shown in Fig. 20(b). The agreement between theory and experiment is excellent. However there is one weakness in these results. In theoretical calculations different values of Hb were used at different temperatures in the mobility model. Since the tunneling probability depends on both the depth of the trap and temperature, it is possible that different number of traps is active at different temperatures. The assumptions and approximations used in deriving Eq.
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