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Aug 26, 2022
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How to make a solar battery from transistors

Everyone knows (and who doesn’t know, will find out now) that silicon is used to produce the main types of solar cells. This is a semiconductor that is widely used in the manufacture of electronic components. For example, in the production of transistors. And an idea arose … Why not try to make a solar battery yourself?

How to make a solar battery from transistors

Making a simple solar battery

For the experiment, transistors of the MJ 2955 type were used.

How to make a solar battery from transistors

It is a silicon direct conduction device. Pretty high power (115 W). This means that the size of the crystal containing silicon pn junctions is also of sufficient size. In order to verify this, it is proposed to cut off the upper part of the transistor with a hacksaw and look inside.

How to make a solar battery from transistors

A silicon wafer opens to the eye, to which the leads are soldered.

How to make a solar battery from transistors
How to make a solar battery from transistors

The tester, switched on to measure voltage with a minimum limit, is connected to the base and collector of the transistor under test.

How to make a solar battery from transistors

With average illumination, the voltage generated by the silicon junction is almost 0.4 V. By closing the transistor with your hand, we reduce the voltage to almost zero. The next stage of testing.

How to make a solar battery from transistors

And if you connect several of these transistors in series. Will the generated current be enough to power any household appliance? Let’s place four transistors with a sawn off upper part of the case on an old laser disc. Practical and aesthetic. All transistors are connected in series. Collector first with base next and so on. We got a chain of four silicon “pn” junctions. “+” is removed from the collector of the first transistor, and minus from the base of the last one.

How to make a solar battery from transistors
How to make a solar battery from transistors

Well, the value of the voltage value has almost quadrupled and became 1.5 V. This is indoors. And on the street with a little cloudiness, it increases to 1.7 V. When you close the light with your hand, the voltage drops. Everything is in theory. When measuring the current value, the device showed 0.015 mA. Of course, this is extremely small. No wonder industrial solar panels are interconnected in series-parallel. In series to increase the output voltage, and in parallel to increase the amount of current generated.

How to make a solar battery from transistors

At the next stage of the experiment, we will try to power a household clock with an LCD indicator from a home-made solar battery. The device is very low-current, designed for a voltage of 1.5 V. The “tablet” of power is removed from the clock, instead of it, wires from the solar battery are soldered to the contacts.

How to make a solar battery from transistors

And the clock “went”! The indicator works by displaying numbers. But as soon as you close the transistors of a homemade battery with your hand, everything disappears right there.

How to make a solar battery from transistors

Conclusion. The experiment was a complete success. The solar panel of transistors is quite efficient.

How to make a solar battery from transistors

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