Solar cell and module thereof
A solar cell and module technology, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of reduced quantum efficiency, low absorption rate, inability to be completely absorbed, etc., to improve the utilization rate of reflection and reabsorption, The effect of increasing short-circuit current and improving quantum efficiency
Inactive Publication Date: 2014-04-09
MOTECH INDUSTRIES
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Problems solved by technology
[0002] In the known silicon solar cell, due to the material properties of silicon, the absorption rate for light with a longer wavelength (about 800nm or more) is low, so that this part of the light cannot be completely absorbed after entering the cell. absorbs, and is easily detached from the back surface of the battery
Although the back surface of the battery is covered by the metal back electrode formed by the metal paste, the metal back electrode is helpful to prevent long-wavelength light from leaving the back surface of the battery, but it hinders the flat surface and single surface of the metal back electrode itself. With the metal layer design, part of the long-wavelength light will be absorbed by the back electrode inside the battery, and the reflection effect of the rest of the long-wavelength light inside the battery is also limited, so most of the long-wavelength light cannot be effectively reflected back to the inside of the battery. Absorption and utilization lead to a decrease in the quantum efficiency of the battery in this band, thereby affecting the photoelectric conversion efficiency of the battery
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[0022] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that in the following description, similar elements are denoted by the same numerals.
[0023] refer to figure 1 , figure 2 , image 3 The first preferred embodiment of the solar cell module of the present invention includes: a first plate 1 and a second plate 2 arranged up and down oppositely, and a plurality of them are connected and arranged on the first plate 1 and the second plate 2 between the solar cells 3 and at least one packaging material 4 located between the first sheet 1 and the second sheet 2 and wrapping around the plurality of solar cells 3 .
[0024] The implementation of the first plate 1 and the second plate 2 is not particularly limited, glass or plastic plates can be used, and the plate on the side of the light-receiving surface of the battery must be light-transmissive. The material of the packaging material 4 ...
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The invention provides a solar cell and a module thereof. The cell comprises a substrate which comprises a first side, a passivation layer which is configured on the first side, a number of transparent reflecting films, and a number of first electrodes which pass through the reflecting films and the passivation layer to contact the first side. A number of transparent reflecting films are sequentially stacked and configured on the passivation layer. Each reflecting film comprises a first layer and a second layer. The first layer and the second layer of each reflecting film have different refractive indexes. The material of the second layer of each reflecting film is different from the material of the passivation layer. According to the invention, through the reflecting films, a light from the substrate is reflected back into the substrate, and is absorbed and used again, thus the quantum efficiency of the cell in a light band of long wavelength is improved; short-circuit current is increased; and the conversion efficiency of the cell is improved.
Description
technical field [0001] The invention relates to a battery and a battery module, in particular to a solar battery and a solar battery module. Background technique [0002] In the known silicon solar cell, due to the material properties of silicon, the absorption rate for light with a longer wavelength (about 800nm or more) is low, so that this part of the light cannot be completely absorbed after entering the cell. Absorbs and releases easily from the back surface of the battery. Although the back surface of the battery is covered by the metal back electrode formed by the metal paste, the metal back electrode is helpful to prevent long-wavelength light from leaving the back surface of the battery, but it hinders the flat surface and single surface of the metal back electrode itself. With the metal layer design, part of the long-wavelength light will be absorbed by the back electrode inside the battery, and the reflection effect of the rest of the long-wavelength light insi...
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Login to View More IPC IPC(8): H01L31/0216
CPCH01L31/02327
Inventor 魏志铭李昆儒
Owner MOTECH INDUSTRIES