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A technology of solar cells and front electrodes, applied in the field of solar cells, can solve the problems of low conversion efficiency of solar cells, achieve the effects of improving fill factor and conversion efficiency, improving lateral transmission efficiency, and reducing series resistance
Pending Publication Date: 2019-01-15
LONGI SOLAR TECH (TAIZHOU) CO LTD
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[0005] In view of the shortcomings of the existing methods, the present application proposes a solar cell and its preparation method to solve the technical problem of low conversion efficiency of the existing solar cell
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Embodiment 1
[0056]The embodiment of the present application provides a solar cell, and the structural schematic diagram of the solar cell is as follows Figures 1 to 4 As shown, it includes: a base 1 , a front structure located on the front of the base 1 and a back structure located on the back of the base 1 .
[0057] In the embodiment of the present application, the front structure includes: a first doped layer 2, a passivation tunneling layer 3, a second doped layer 4, a passivation anti-reflection layer 5, and a front electrode 6 (negative electrode thin grid line); A doped layer 2 , a passivated tunneling layer 3 , a second doped layer 4 and a passivated anti-reflection layer 5 are arranged in sequence, and the front electrode 6 passes through the passivated anti-reflection layer 5 and contacts the second doped layer 4 .
[0058] Compared with the prior art, the embodiment of the present application adds a passivation tunneling layer 3 to provide better passivation, which can effecti...
Embodiment 2
[0090] Based on the same inventive concept, an embodiment of the present application provides a method for preparing a solar cell. The schematic flow chart of the method is shown in Figure 9 shown, including:
[0091] S1, pretreating the substrate 1 .
[0092] Optionally, step S1 specifically includes: performing damage removal treatment and surface texturing treatment on the substrate 1 to form a pyramid texture on the front surface of the substrate 1 .
[0093] Taking p-type monocrystalline silicon as the substrate of the battery as an example, first, use a 60°C solution containing KOH for damage removal treatment, and use a solution containing KOH for surface texturing at 80°C to form a pyramid texture. The scale of the pyramid can reach 2-5um (micrometer); then, the substrate 1 is cleaned with a mixed solution containing hydrofluoric acid and hydrochloric acid and deionized water in sequence, and then dried.
[0094] S2 , performing doping treatment on the front surface...
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Abstract
The invention provides a solar cell and a preparation method thereof. The solar cell comprises a substrate, a front structure located on the front side of the substrate and a back structure located onthe back side of the substrate; The front structure comprises a first doping layer, a passivation tunneling layer, a second doping layer, a passivation antireflection layer and a front electrode. Thefirst doping layer, the passivation tunnel layer, the second doping layer and the passivation antireflection layer are arranged in sequence, and the front electrode is in contact with the second doping layer through the passivation antireflection layer; The backside structure comprises a backside passivation film and a backside electrode; The back electrode is in contact with the substrate through a contact area of the back passivation film. In the invention, a passivation tunneling layer is added, the surface recombination rate of the battery is effectively reduced, and the surface passivation performance of the battery is improved; The contact between the front electrode and the second doping layer can effectively improve the lateral transfer efficiency of the positive surface of the battery, reduce the series resistance of the battery, and thus improve the fill factor and conversion efficiency of the battery.
Description
technical field [0001] The present application relates to the technical field of solar cells, in particular, the present application relates to a solar cell and a preparation method thereof. Background technique [0002] At present, with the gradual depletion of fossil energy, solar cells are used more and more widely as a new energy alternative. A solar cell is a device that converts the sun's light energy into electrical energy. Solar cells use the principle of photovoltaics to generate carriers, and then use electrodes to extract the carriers, which is beneficial to the effective use of electrical energy. [0003] Most of the commercial solar cells currently on the market are P-type solar cells. Among them, PERC battery (passivated emitter and backside battery) is the type of battery that is being promoted rapidly at present. The PERC cell structure is to prepare a doped layer on the surface of the solar cell, and then prepare a passivation layer and electrodes on it. ...
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