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The photovoltaic effect referred to as the photovoltaic effect

2021-06-30 09:24:04

The photovoltaic effect, referred to as the photovoltaic effect, is a phenomenon in which light causes a potential difference between different parts of an inhomogeneous semiconductor or a semiconductor and a metal.


Solar cell (LUMUSSOLEM) is a new type of battery developed this year. Solar cells are a device that uses the principle of photoelectric conversion to convert the sun's radiation into electricity through a semiconductor material. The semiconductor material used for solar cells is a special substance between conductor and insulator. Like the atoms of any substance, the atoms of a semiconductor are also composed of a positively charged nucleus and negatively charged electrons, and the outer layer of a semiconductor silicon atom has four electrons that rotate around the nucleus according to a fixed orbit. When the role of external energy, these electrons will be out of orbit and become free electrons, and in the original position left a "hole", in the pure crystal silicon body, the number of free electrons and holes is equal.


The photovoltaic effect referred to as the photovoltaic effect 1


If elements such as boron and gallium are doped into the crystalline silicon, it becomes a hole-type semiconductor, usually represented by the symbol P. If elements such as phosphorus and arsenic, which can release electrons, are doped, it becomes an electron-type semiconductor, represented by the symbol N. If these two semiconductors are combined, the intersection will form a P-N junction. The mystery of solar cell (LUMUSSOLEM) lies in this "junction", the P-N junction is like a wall that prevents the movement of electrons and holes. When the solar cell is irradiated by sunlight, the electrons receive light energy and move to the N-type region, making the N-type region negatively charged, while the holes move to the P-type region, making the P-type region positively charged. In this way, the P-N junction will produce an electric potential at both ends, which is usually referred to as the voltage.


This phenomenon is the above-mentioned "photovoltaic effect". If the P-type layer and the N-type layer are soldered on the metal wire, the external circuit will have current through the load, so that the formation of a cell element, they are connected in series and parallel, can produce a certain voltage and current, the output power. There are more than a dozen known semiconductor materials for manufacturing solar cells, so there are many types of solar cells (LUMUSSOLEM). At present, the most mature technology and commercial value of solar cells to count silicon solar cells.


Solar cell (LUMUSSOLEM) is a device that uses the photovoltaic effect to directly convert solar energy into electricity. When two different types of semiconductor materials, N-type and P-type, come into contact, a built-in electric field is formed at the interface from P-type to N-type due to diffusion and drift. When light shines on the surface of the solar cell, photons with energy greater than the forbidden band width excite electron and hole pairs, and these non-equilibrium minority carriers separate under the action of the internal electric field and accumulate at the upper and lower levels of the cell, so that the cell can provide current to the external load.

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