In addition to the photocell sensor, there are other photosensitive elements:Photoresistors: These change resistance with light levels. Photodiodes: Convert light into an electrical current.
Their main work is based on a phenomenon known as photo electric effect, in which a light sensitive material absorbs light energy or photons and emits an electron thus generating electricity. These are used in various electrical devices. We will discuss these photocells, their types, significance, and uses in this article.
Ans: light There are three types of photocells, Photoemissive, Photovoltaic, and Photoconductive.
The material which is most commonly used to make photocells is Cesium (Cs), it is a metal. Other than that there are other elements which can be used to make photocells, such as Silicon, Germanium, etc. There is a range of light radiations starting from microwaves, based on the frequency and wavelength of the light waves.
Photosensitive materials of this type provide light absorption and charge transport within the same material. Photons are absorbed within the region covered by the electrical field or in the neighbourhood where charge carriers can still diffuse into the field-determined region.
The term photoemissive means a material which can emit electrons when energy in certain forms like radiation is supplied to the material. When the energy is provided to the material, the electrons in the material get excited and are thus emitted out of their original orbits. A photoemissive cell is more commonly known as a Phototube.
Different applications may require photocells of varying sizes and shapes. For example, in consumer electronics, where miniaturization is key, small and compact photocells are often preferred. However, in outdoor lighting systems, larger photocells may be necessary to capture a wider range of light.
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