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Two-dimensional heterojunction photovoltaic cell

A two-dimensional heterojunction and photovoltaic cell technology, applied in photovoltaic power generation, circuits, electrical components, etc., can solve problems such as weak light absorption, and achieve the effects of reduced spontaneous radiation loss, enhanced light absorption, and increased efficiency

Active Publication Date: 2019-07-30
GUIZHOU MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the light absorption of this photovoltaic cell is weak, and it is necessary to use optical structures to enhance its absorption of sunlight

Method used

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  • Two-dimensional heterojunction photovoltaic cell

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Embodiment 1

[0036] like figure 1 As shown, this embodiment provides a two-dimensional heterojunction photovoltaic cell, including a fixed layer 1, a two-dimensional material heterojunction 2 and an optical microcavity, the two-dimensional material heterojunction 2 is arranged in the optical microcavity, and the optical microcavity Both ends of the cavity are fixedly connected to the fixed layer 1, and the optical microcavity is used to reflect sunlight multiple times, so that the two-dimensional material heterojunction 2 absorbs sunlight multiple times, and the two-dimensional material heterojunction 2 absorbs photons in sunlight And converted to electrical energy output;

[0037] Specifically, the optical microcavity is a photonic crystal with a defect layer, and the two-dimensional material heterojunction 2 is located in the defect layer of the photonic crystal with a defect layer. Since the interior of the photonic crystal with a defect layer has different refractive indices, different...

Embodiment 2

[0043] like figure 2 As shown, this embodiment also provides a two-dimensional heterojunction photovoltaic cell. The difference between this embodiment 2 and embodiment 1 is that there are three two-dimensional material heterojunctions 2 and photonic crystals containing defect layers, Distributed side by side and fixedly connected on the fixed layer 1, distributed in a side-by-side array, three photonic crystals with defect-containing layers and two-dimensional material heterojunction 2 arranged side by side in a side-by-side distribution are all arranged on the vertical side of the Fresnel convex lens 5 Directly below, the sunlight gathered by the Fresnel convex lens 5 enters the three photonic crystals containing defect layers, and the three photonic crystals containing defect layers arranged side by side and the two-dimensional material heterojunction 2 can reduce the heat dissipation. Loss, improve the conversion efficiency of the cell, because the spontaneous emission so...

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Abstract

The invention relates to a two-dimensional heterojunction photovoltaic cell, and belongs to the field of photovoltaic cells. The two-dimensional heterojunction photovoltaic cell comprises a fixed layer, a two-dimensional material heterojunction and an optical micro cavity, wherein the two-dimensional material heterojunction is arranged in the optical micro cavity, and two ends of the optical microcavity are fixedly connected to the fixed layer. The two-dimensional material heterojunction has the beneficial effects that sunlight irradiates the optical micro cavity, the sunlight in the opticalmicro cavity is reflected by the optical micro cavity, so that the light ray absorption of the two-dimensional material heterojunction is improved, meanwhile, the automatic radiation three-dimensionalangle of the photovoltaic cell is reduced, the automatic radiation loss of the photovoltaic cell is reduced and the efficiency of the photovoltaic cell is improved.

Description

technical field [0001] The invention belongs to the field of photovoltaic cells, and in particular relates to a two-dimensional heterojunction photovoltaic cell. Background technique [0002] In order to reduce greenhouse gas emissions, photovoltaic power generation has been developed rapidly. Photovoltaic power generation has become one of the main choices for human new energy development, and the efficiency of photovoltaic cells has been continuously improved. However, the efficiency of photovoltaic cells has a theoretical limit due to physical mechanisms. Even if the light absorption rate and quantum efficiency of a photovoltaic cell are 1, its maximum output power is only where q is the charge of electrons, is the open circuit voltage, T is the temperature of the photovoltaic cell, is the surface temperature of the sun, k is the Boltzmann constant, is the total solid angle of spontaneous radiation, is spherical or can be approximated as a spherical conventional photovol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/054H01L31/072
CPCH01L31/072H01L31/0543H01L31/0547Y02E10/52
Inventor 刘江涛杨琴范孟慧黄金保罗姣莲罗胜耘王声权
Owner GUIZHOU MINZU UNIV
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