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Solar cell and electronic device

A technology of solar cells and front electrodes, applied in battery circuit devices, circuits, current collectors, etc., can solve the problems of short battery life of smart glasses, decreased photoelectric conversion efficiency, and inability to meet the power requirements of smart glasses lenses

Active Publication Date: 2021-08-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the size of thin-film solar cells with high photoelectric conversion efficiency is basically 0.1cm 2 At the level of laboratory devices around the world, as the effective area of ​​the device expands, the photoelectric conversion efficiency will drop rapidly due to the influence of the square resistance of the electrode film, making it impossible to meet the power requirements of smart glasses with a large area size
For example, according to literature reports, the average transmittance is 24%, the size is 0.24cm 2 Small-area battery devices scaled up to a size of 15.5cm 2 The size of the lens, the photoelectric conversion efficiency drops by 80 times under standard lighting conditions
Therefore, it is necessary to provide a method that can improve the photoelectric conversion efficiency of large-area solar cells to solve the problem of short battery life faced by smart glasses and promote the application of thin-film solar cells in the field of smart wearable devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] A kind of smart glasses, including solar battery lens, the structure of solar battery lens can be found in Figure 16 . The solar cell lens includes a lens substrate 10 and a solar cell 20 disposed on the lens substrate 10, and the conductive area A of the front electrode 21 of the solar cell 20 adopts an Ag / Cu composite metal grid layer 202 embedded in a transparent colloid layer 201, wherein, The grid groove width of the metal grid layer 202 is about 3.5 μm, the groove depth is about 3 μm, the silver filling depth in the groove is about 2.3 μm, the copper plating depth is about 1.0 μm, and the metal copper protruding from the surface of the groove is polished, The step after polishing is less than 10nm (ie, the height difference between the upper surface of the metal grid layer 202 and the upper surface of the transparent colloidal layer 201 is less than 10nm), and the groove pattern in the transparent colloidal layer 201 is a regular hexagon with a side length of 85 ...

Embodiment 2

[0099] Compared with Example 1, the only difference is that: the conductive region D of the back electrode is an Al electrode, the thickness of the Al layer is 150nm, and the width Wr is 1mm, and the conductive region C of the back electrode adopts a thin-layer metal / metal oxide composite electrode. Ag / MoO 3 Composite electrode, wherein, Ag thickness 10nm, MoO 3 Thickness 35nm, prepared 30cm 2 The photoelectric conversion efficiency of the large-area device cell is more than 2%.

Embodiment 3

[0101] The structure of the solar cell lens can be found in Figure 17 . Compared with Example 1, the only difference is that: the conductive region D of the back electrode 22 is an Al electrode, the thickness of the Al layer is 110 nm, and the width Wr is 1 mm, and the conductive region C of the back electrode 22 is composited with a metal grid 224 embedded in the TCO layer 223 Electrodes, wherein the TCO is ITO, the thickness of the ITO layer 223 is 300nm, the width of the grid line in the metal grid 224 is 1 μm, the depth is 1 μm, the pattern is a regular hexagon, the side length of the pattern is 85 μm, and the prepared 30cm 2 The photoelectric conversion efficiency of the large-area device cell is more than 2%.

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Abstract

The invention provides a solar cell. The solar cell comprises a front electrode, a functional layer and a back electrode, the front electrode is an electrode on one side of a light receiving surface, the front electrode comprises a high-conductivity area and a low-conductivity area which are adjacent to each other, or the back electrode comprises the high-conductivity area and the low-conductivity area which are adjacent to each other. According to the solar cell, the front electrode and / or the back electrode are / is designed in different regions, and the conductivity of one conductive region is designed to be higher than that of the other conductive region, so that thin film sheet resistance loss caused by large-range transverse non-uniform transfer of light current can be effectively avoided, and the photoelectric conversion efficiency of the cell is improved; and according to different requirements of different regions in different application scenes, material selection can be flexibly performed in different regions, and the comprehensive performance of the battery is improved. The invention also provides an electronic device comprising the solar cell.

Description

technical field [0001] The embodiments of the present application relate to the field of energy technology, and in particular, to a solar cell and an electronic device thereof. Background technique [0002] In recent years, smart glasses consisting of conventional sunglasses or optical glasses combined with Bluetooth, audio and convenient human-computer interaction have become more and more popular among consumers. However, with the excavation and integration of more diversified functions of smart glasses, the contradiction between smart glasses functions and battery life has become more prominent, increasing consumers' anxiety about battery life. [0003] Thin-film solar cells have excellent characteristics such as high efficiency, thinness, flexibility, transparency and color adjustment, and are the best choice for power supply devices for wearable smart devices such as smart glasses. For an area of ​​20-30cm 2 If the single lens of smart glasses can obtain tens to hundr...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H02J7/35G02C11/00G02B27/01
CPCH01L31/022425H01L31/022441H02J7/35G02C11/10G02B27/017Y02E10/50H01L31/022466H02S30/00G02B2027/0178H10K30/81H01L31/046H01L31/0543
Inventor 王硕辛凯刘云峰
Owner HUAWEI TECH CO LTD
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