Week 5: Temperature variation

  By 4 weeks, we had calculated several important parameters representing the performance of a specified organic schottky diode assuming that the diode was at the temperature of 300K. However, the performance of the diode could be changed in different temperature.  Therefore, our supervisor gave us sorts of data that represents the current against the voltage applied to the diode made up of a specified organic material in different temperature.

 At first, we plotted the graph of the exponential of current against voltage applied as shown below:

Figure 1: The volt-ampere characteristics of Schottky barrier diode

  In the graph, each curve represents characteristic of current  against voltage at a determined temperature. From the graph, exponential region of each curve can be found. Then we choose two points in exponential region of each curve to calculate the To, Tc and γ of the diode at different temperature (T). The graphs of To, Tc and γ against temperature T are shown below:

Figure 2: The change of To at different temperature

Figure 3: The change of Tc at different temperature

Figure 4: The change of γ at different temperature

  After ignored some error points in the graphs, we found that with the temperature approaching 300K from 188K, To and γ became smaller and Tc became larger. This shows that with the temperature becoming higher, the performance of the diode is better. We suggested that the improvement of performance at higher temperature may cause by the higher mobility of the carriers.