- #1
yunusx
- 10
- 0
Hello!
I am trying to carry out wavelength depended photoconductivity experiment to a semiconductor thin film material. I use keithley 2400 sourcemeter. I do apply voltage to the sample under pressure and read the current. My problem is when i apply a constant voltage to the sample i see that the current slowly decreases. For example, i applied 15 volt to the sample and read the current of 2,45897 microAmp. As i wait i see that the voltage drops continuously and slowly. it becomes 2,45754 three second later and it cahnges almost at this rate. I do the experiment in the ohmic region for that sample. I tried different higher and lower voltages but the situation didnt change. Temperature is constant. i don't know why that effect happens. Could anyone help me about why this occours?
Thanks
I am trying to carry out wavelength depended photoconductivity experiment to a semiconductor thin film material. I use keithley 2400 sourcemeter. I do apply voltage to the sample under pressure and read the current. My problem is when i apply a constant voltage to the sample i see that the current slowly decreases. For example, i applied 15 volt to the sample and read the current of 2,45897 microAmp. As i wait i see that the voltage drops continuously and slowly. it becomes 2,45754 three second later and it cahnges almost at this rate. I do the experiment in the ohmic region for that sample. I tried different higher and lower voltages but the situation didnt change. Temperature is constant. i don't know why that effect happens. Could anyone help me about why this occours?
Thanks