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Preparation method of tandem solar cell capable of reducing cost and improving conversion efficiency

A stacked solar and stacked battery technology, applied in sustainable manufacturing/processing, circuits, photovoltaic power generation, etc., can solve the problems of limited scope of application, high production costs, and unsuitability for large-scale promotion and use, and achieve parity Going online, improving conversion efficiency, and benefiting large-scale industrial application

Active Publication Date: 2021-05-18
东方日升(宁波)新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The double-junction tandem solar cell produced by the above invention patent application has high cell efficiency, but its production cost is high, and the scope of application is limited by cost, so it is not suitable for large-scale promotion and use.

Method used

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  • Preparation method of tandem solar cell capable of reducing cost and improving conversion efficiency

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Embodiment 1

[0038] This embodiment provides a method for preparing a tandem solar cell that can reduce costs and improve conversion efficiency,

[0039] Such as figure 1 shown, including the following steps:

[0040] Step 1: Bottom battery preparation, texturing, using N-type monocrystalline silicon wafers as silicon substrates, placing them in texturing liquid for texturing treatment, wherein, the texturing solution can be according to the mass ratio KOH: texturing additive: H 2 The ratio of O=20:3:160 is prepared, the temperature of the texturing solution is 80°C, and then it is cleaned in hydrofluoric acid with a volume concentration of 2%, and the surface of the silicon wafer is cleaned to obtain a polysilicon layer 1. The texturing additive here It refers to the addition of chemical additives that are beneficial to the reaction results and product performance during the texturing process of monocrystalline silicon solar cells. It is generally composed of water, IPA, NaOH, weak acid ...

Embodiment 2

[0055] This embodiment provides a method for preparing a low-cost high-efficiency tandem solar cell, comprising the following steps:

[0056] Step 1: Bottom battery preparation, texturing, using N-type monocrystalline silicon wafers as silicon substrates, placing them in the texturing solution for texturing treatment, wherein the texturing solution is based on the mass ratio KOH: Texturing additive: H 2 The ratio of O=20:3:160 is prepared, the temperature of the texturing solution is 80°C, and then it is cleaned in hydrofluoric acid with a volume concentration of 4%, and the surface of the silicon wafer is cleaned to obtain a polysilicon layer 1;

[0057] Step 2: Form a pn junction. Print a layer of boron paste on one side of the polysilicon layer 1 by printing, inkjet or spin coating. The thickness of the boron paste is 10 μm, and then dry at a temperature of 300° C. The temperature is generally not as high as 600), and the pn junction layer 2 is obtained;

[0058] Step 3: T...

Embodiment 3

[0070] This embodiment provides a method for preparing a low-cost high-efficiency tandem solar cell, comprising the following steps:

[0071] Step 1: Bottom battery preparation, texturing, using N-type monocrystalline silicon wafers as silicon substrates, placing them in the texturing solution for texturing treatment, wherein the texturing solution is based on the mass ratio KOH: Texturing additive: H 2 The ratio of O=20:3:160 is prepared, the temperature of the texturing solution is 80° C., and then it is cleaned in hydrofluoric acid with a volume concentration of 5%, and the surface of the silicon wafer is cleaned to obtain a polysilicon layer 1;

[0072] Step 2: Form a pn junction. Print a layer of boron paste on one side of the polysilicon layer 1 by printing, inkjet or spin coating. The thickness of the boron paste is 20 μm, and then dry it at 200°C to obtain a pn junction. junction2;

[0073] Step 3: Tunneling silicon oxide deposition, using hot oxygen equipment, deposi...

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Abstract

The invention belongs to the technical field of solar cell preparation, in particular to a method for preparing a low-cost high-efficiency laminated solar cell. The present invention comprises the following steps in sequence: texturing, pn junction formation, tunneling silicon oxide deposition, phosphorus element doping, annealing, passivation layer growth, patterned opening, conductive layer deposition, electron transport layer formation, perovskite Film formation, hole transport layer formation, antireflection layer formation and electrode preparation. The solar cell prepared by the present invention has a stacked cell structure, which greatly improves the conversion efficiency of the cell, and the top cell of the present invention adopts a very low-cost perovskite cell, and the bottom cell adopts a high-efficiency passivation contact cell , the key and expensive preparation process of the whole battery is all realized by ultra-low-cost printing or spin-coating or ink-jet methods of various chemical slurries, thus greatly reducing the manufacturing cost while greatly improving the conversion efficiency of the battery , which is conducive to large-scale industrial application and realizes parity Internet access.

Description

technical field [0001] The invention belongs to the technical field of solar cell manufacturing, and in particular relates to a method for preparing a stacked solar cell capable of reducing cost and improving conversion efficiency. Background technique [0002] Improving conversion efficiency and reducing manufacturing costs are always the most important factors in the development of the photovoltaic industry. In recent years, with the development of photovoltaic technology, some new technologies to improve conversion efficiency have emerged, such as alumina passivation, multi-busbar technology, Passivated contact technology, etc. Among them, passivation contact technology is considered to be the most promising high-efficiency battery technology for industrialization after PERC. At present, the highest efficiency of the battery with this structure is the N-type battery created by the Fraunhofer Institute for Solar Energy Systems in Germany, with an efficiency of 25.8%. Whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18H01L51/48
CPCH01L31/1804H10K71/12Y02E10/547Y02E10/549Y02P70/50
Inventor 崔艳峰袁声召庄宇峰万义茂黄强林海峰
Owner 东方日升(宁波)新能源有限公司
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