The disposal method is as follows:
1. Keep the light intensity unchanged when measuring the basic characteristics of solar cells, use a stable light source, and maintain the distance between the light source and the solar. Constant cell to guarantee the measurement process. The light intensity remains unchanged.
2. Keep the temperature constant. Since the performance of solar cells changes with temperature, solar cells and test instruments must be placed in the same environment for a certain time before measurement to allow them to reach a constant temperature. stable state. Then take the measurement.
Reflection Questions for Solar Cell Characteristics Research Experiment Report
System error:
1. The relationship between the internal resistance of the ammeter and voltmeter and the internal resistance of the wire and the recontact resistance The impact of experience;
2. Error caused by ignoring I0 in least squares adjustment
3. sealed due to wire access;
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4. Error caused by multimeter and rheostat housing;
5. Wire access resistance.
Random error:
1. Multimeter reading is unstable;
2. The wire access resistance;
3. Temperature and frequent fluctuations in supply voltage;
4. There are slight vibrations on the experimental table, causing the light intensity to be inconsistent
5. of the light source itself not being absolutely constant.
Detailed information
Solar cells are devices that directly convert light energy into electrical energy via the photoelectric effect or photochemical effect. Crystalline silicon solar cells that work with the photoelectric effectare the most widespread, while thin-film cells that operate with the photochemical effect are still in their infancy.
The working principle of solar cells:
Sunlight shines on the p-n junction of the semiconductor to form new hole-electron pairs under the action of the electric field integrated p-n junction. , the photogenerated holes flow to the p region, the photogenerated electrons flow to the n region, and the current is generated after the circuit is turned on. This is the photoelectric effect.
References:
1. Generally, the effective light level should be above 200W/㎡. Light intensity and short circuit current are basically linear. Of course, solar cells can be short-circuited. The principle is different from that of ord batteriesinaries. They do not generate electrical energy through internal reactions. It is simply a device that converts incident light into electrical energy. intermediate conversion device.