Technical data

Photo diodes

Article no: P1378200

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Principle

The special structure of a photodiode allows light to penetrate into the border layer of the pn junction, where photon energy creates pairs of charge carriers, that allow electric current to flow. The intensity of this photo-current is proportional to the illuminating intensity, so that a photodiode is extremely suitable for optical measurement tasks. There is no linear relationship to the voltage generated by the light. Photodiodes are therefore frequently used as illumination dependent sources of current in short-circuit mode. When a voltage is applied, the photo-current is only insignificantly increased.
If the students are to recognize the linear dependence of the photo-current intensity on the illuminating intensity, then it is necessary to clarify the connection between the distance of a point light source from an irradiated surface on the one hand, and the illuminating intensity on the other hand.
The first experiment shows the proportionality between the illuminating intensity and the short-circuit current intensity of the photodiode.

Benefits

No additional cable connections between the building blocks needed - clear arragned and quick setup
Contact saftey due to puzzle blocks system
Corrosion-free gold plated contacts
Doubled earning sucess: Electric circuit diagram on top, real components can be seen unterside

Tasks

According to which principle does a photodiode work?

Examine the behaviour of a photodiode under illumination. Measure the short-circuit current intensity and the idling voltage of the photodiode at various illuminating intensities.

Scope of delivery

Junction module, SB	05601-10	2
Straight connector module with socket, SB	05601-11	2
Socket module for incandescent lamp E10, SB	05604-00	1
Photodiode module, SB	05653-00	1
Connecting cable, 32 A, red, various lengths	07360-01	1
Connecting cable, 32 A, blue, various lengths	07360-04	1
Connecting cable, 32 A, red, various lengths	07361-01	2
Connecting cable, 32 A, blue, various lengths	07361-04	2
Filament lamp 6 V/3 W, E10, 10 pcs.	35673-03	1
PHYWE Power supply, 230 V,DC: 0...12 V, 2 A / AC: 6 V, 12 V, 5 A	13506-93	1
PHYWE Analog multimeter, 600V AC/DC, 10A AC/DC, 2 MΩ, overload protection	07021-11	2

Recommended accessories

Flashlight, w/o battery,medium

08164-00