Oil Bath Exp
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The document outlines an experiment conducted by Trisha Banerjee to evaluate the energy band gap of silicon using a silicon diode and various apparatus including a regulated DC power supply and a temperature-controlled oven. The procedure involves measuring the diode current at room temperature, observing voltage changes with temperature, and determining the energy band gap from characteristic graph slopes. Key considerations include the stabilization of temperature and accurate measurements during the experiment.
Oil Bath Exp
- 1. To evaluate the energy band gap of Silicon through the study of forward bias characteristicsTrisha Banerjee _bhu @ 2010
- 2. Apparatus:- (IN 4007 ) Silicon diode, regulated 10 V dc power supply , 2 V range DVM ( digital volt meter) , fast temperature controlled oven, thermometer, milliamp range ammeter.A circuit diagram associate with the experiment:-Variable high resistance in seriespn junction diodeDVMPower supplyMilliammeterTrisha Banerjee _bhu @ 2010
- 3. Brief procedure about the experiment:-1) initially we measure the diode current in forward bias at room temperature using the given diode kit. 2) secondly we measure the variation in voltage with the variation in temperature using the diode kit and the temperature controlling oven where the silicon diode is already dipped. 3) now using the particular slopes of the different characteristics graphs obtained by these variations we finally got the energy band gap of the diode dipped in oil bath.Trisha Banerjee _bhu @ 2010
- 4. voltmeterammeterKnob for adjusting the voltagediodeHigh resistance in seriesTrisha Banerjee _bhu @ 2010
- 5. DVM (Digital voltmeter) for measuring the voltage of the voltmeterTrisha Banerjee _bhu @ 2010
- 6. Different graphs for determine the different slopesGraph for the slope of S1(i.e.forward characteristics of diode)Graph for the slope S2 (i.e.. variation of voltage with temperature of diode).
- 7. Fast temperature controlling oven:-Thermometer for measure the temperatureIndicator for coolingIndicator for heatKnob for ranging the temperature to heat
- 8. NOTES:- 1) initially totally switched off the oven , as the temperature initial increase the slow down of temperature is very difficult process as take much time. 2) get the forward bias characteristics with the variation of current with voltage in DVM. 3)now for the variation of voltage with temperature we have to very fast and accurate as for low temperature the variation is very fast and difficult to notice . 4) now for temperature detection the oven operating should be well known . For this experiment we set the ammeter to 2mAand switch off the diode kit . now raise the temperature about 5 points to the room temp . Till the cooling red light will be blow off and just when it reach the 5 points inc. temp the heat button glow then switched off the oven and then when the mercury stables note down the temperature and diode voltage from DVM at 2 mA constant current.Trisha Banerjee _bhu @ 2010