What is photovoltaic effect and LED

What is photovoltaic effect and LED?

The photovoltaic effect is formed by the increase in the number of free electron-hole pairs inside the semiconductor when illuminated, so it is an internal photoelectric effect.

At present, semiconductor optoelectronic components made according to the photoelectric effect can be divided into two categories: one is the use of the “photoconductivity effect”, that is, the photoresistor made according to the law of the change in the conductivity of the semiconductor during light; the other is Photovoltaic cells that can convert light energy into electrical energy.

LED is light emitting diode, which is the abbreviation of light emitting diode in English.

The light-emitting diode is a solid-state semiconductor device that can directly convert electrical energy into visible light. It is known as a new light source in the 21st century. It has the advantages of high efficiency, long life, and resistance to damage that traditional light sources cannot compare with.

The light-emitting principle of light-emitting diodes is exactly the opposite of the power generation principle of photovoltaic cells. The power generation principle of photovoltaic cells relies on the photovoltaic effect of semiconductor materials to convert light into electrical energy, while light-emitting diodes also rely on the photovoltaic effect of semiconductor materials, but they do not convert light. It is electrical energy, and on the contrary, it converts electrical energy into light. Strictly speaking, it should not rely on the photovoltaic effect, but the “voltaic effect”, which can also be called the electroluminescence effect.

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