Crystal particle granule solar battery and manufacturing method thereof

A technology of solar cells and crystals, applied in the field of solar cells, can solve problems such as current leakage and short circuit, and achieve the effects of low energy consumption, reduced manufacturing costs, and high material utilization

Inactive Publication Date: 2007-07-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem it has is that the gap between the particles will short-circuit the transparent conductive layer on the upper surface and the bottom electrode, so that the current will leak from the short-circuit point.

Method used

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  • Crystal particle granule solar battery and manufacturing method thereof
  • Crystal particle granule solar battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The solar-grade P-type polysilicon material with a resistivity of 5 ohm cm is crushed into silicon particles, and after screening, the particles with a size of 0.3 mm to 0.4 mm are selected. After the selected silicon particles are cleaned, phosphorus is diffused. The diffusion method used is the same as the method for preparing polycrystalline silicon or single crystal silicon solar cells. The outer surface is N and the inner is P-type wrapping structure. PN junction, as shown in Figure 1. The diffusion temperature is 900°C, nitrogen protection and a small amount of oxygen are introduced during the diffusion, so that a very thin oxide layer is formed on the outermost part of the particles.

[0049] Spread the silicon particles with diffused PN junction densely on a plane, and apply appropriate vibration to make the particles densely arranged, and at the same time ensure that the particles are arranged in a single layer without stacked particles, as shown in Figure 2. A...

Embodiment 2

[0056] The solar-grade P-type polysilicon material with a resistivity of 5 ohm cm is crushed into silicon particles, and after screening, the particles with a size of 0.3 mm to 0.4 mm are selected. After the selected silicon particles are cleaned, phosphorus is diffused on the surface to form a wrapping structure with N on the outer surface and P-type inside, and a PN junction in the crystal grain, as shown in Figure 2. The diffusion temperature is 900°C, nitrogen protection and a small amount of oxygen are introduced during the diffusion, so that the outermost layer of the particles will have an insulating layer of oxide and / or silicon nitride.

[0057] Spread the silicon particles with diffused PN junction densely on a plane, and apply appropriate vibration to make the particles densely arranged, and at the same time ensure that the particles are arranged in a single layer without stacked particles, as shown in Figure 3. After such The area occupied by the treated silicon pa...

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Abstract

The invention relates to the crystal particle solar battery and its preparation method and includes the conducting substrate, semiconductor crystal particle and transparent conducting layer. The clearance of the semiconductor crystal particle between the conducting substrate and the transparent conducting layer is filled with insulating material to isolate the conducting substrate from the transparent conducting layer. The particles are spread on a plane and stuck on the flexible material with waterproof glue. A half of the particles are covered by the waterproof glue and the other half is naked. We erode the surface of the naked particle to reveal the inner material of the crystals, adhere or weld them on the conducting substrate, get rid of the flexible material and waterproof glue, fill the clearance between the particles with insulating material, erode the oxide layer and nitrided layer on the surface of the crystal particles, reveal the conducting layer and aggradate the upper surface electrode and decreased reflecting layer on it.

Description

technical field [0001] The invention relates to a solar cell, especially a crystal particle solar cell and a preparation method thereof. Background technique [0002] In this specification, the light-receiving side of the solar cell is called the upper surface or the upper surface, and the opposite surface is called the lower surface or the substrate. The electrode drawn from the upper surface is called the upper electrode, and the electrode drawn from the substrate is called the lower electrode or the back electrode. [0003] Traditional crystalline silicon solar cells include monocrystalline silicon solar cells and polycrystalline silicon solar cells. This type of solar cell is made of boron-doped single crystal or polycrystalline silicon wafers, and its resistivity is between 0.2 ohm cm and 10 ohm cm. Phosphorus is diffused on the upper surface to form a PN junction. In order to reduce the reflection on the surface of the battery, one or more layers of anti-reflection f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/06H01L31/04H01L31/18H01L31/068
CPCH01L31/0384Y02E10/50H01L31/061Y02E10/547
Inventor 刘维一
Owner NANKAI UNIV
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