Cascade solar cell with nano rod array optical coupling element

A nanorod array, stacked solar technology, applied in the field of solar cells, can solve problems such as limitations, and achieve the effects of improving absorption efficiency, improving flexibility, and reducing manufacturing costs

Inactive Publication Date: 2010-04-07
YUNNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the multi-junction tandem solar cell structure requires materials with different band gaps, so its practical application is often limited by materials.

Method used

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  • Cascade solar cell with nano rod array optical coupling element
  • Cascade solar cell with nano rod array optical coupling element
  • Cascade solar cell with nano rod array optical coupling element

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Embodiment 1

[0013] Such as figure 1 As shown, the embodiment uses a vertical ZnO nanorod array as the anti-reflection layer. ZnO has a suitable refractive index (n=2) and band gap (~3.3eV), and is used in the anti-reflection layer of solar cells, which has the advantages of high transmission, low broad-spectrum reflection and low absorption. Such as figure 2 As shown, the tandem solar cell uses upper, middle and lower cells, the lower cell uses a conventional Si cell (with a band gap of 1.1eV), and the upper cell and the middle cell use Si quantum dot cells. In order to achieve the absorption of the solar spectrum For matching, the band gaps of the upper and lower Si quantum dot solar cells are respectively 2eV and 1.5eV, and the corresponding Si quantum dot sizes are 20nm and 65nm respectively. Semiconductor quantum dots are made of SiO 2 、Si 3 N 4 and SiC-based Si quantum dots. According to needs, the number of quantum dot laminated sub-batteries is 1, 2, 3, ..., up to n. The ba...

Embodiment 2

[0015] Examples using vertical TiO 2 The nanorod array is an anti-reflection layer. TiO 2 With a suitable refractive index and band gap (~3.2eV), it is used in the anti-reflection layer of solar cells, and has the advantages of high transmission, low broad-spectrum reflection and low absorption. Such as figure 2 As shown, the tandem solar cell uses upper, middle and lower cells, the lower cell uses a conventional Si cell (with a band gap of 1.1eV), and the upper cell and the middle cell use Si quantum dot cells. In order to achieve the absorption of the solar spectrum For matching, the band gaps of the upper and lower Si quantum dot solar cells are respectively 2eV and 1.5eV, and the corresponding Si quantum dot sizes are 20nm and 65nm respectively. Semiconductor quantum dots are made of SiO 2 、Si 3 N 4 and SiC-based Si quantum dots. According to needs, the number of quantum dot laminated sub-batteries is 1, 2, 3, ..., up to n. The battery material adopts Si and TiO ...

Embodiment 3

[0017] Examples using vertical SiO 2 The nanorod array is an anti-reflection layer. SiO 2 With a suitable refractive index (~1.8), it is used in the anti-reflection layer of solar cells, and has the advantages of high transmission and low broad-spectrum reflection. Such as figure 2 As shown, the tandem solar cell uses upper, middle and lower cells, the lower cell uses a conventional Si cell (with a band gap of 1.1eV), and the upper cell and the middle cell use Si quantum dot cells. In order to achieve the absorption of the solar spectrum For matching, the band gaps of the upper and lower Si quantum dot solar cells are respectively 2eV and 1.5eV, and the corresponding Si quantum dot sizes are 20nm and 65nm respectively. Semiconductor quantum dots are made of SiO 2 、Si 3 N 4 and SiC-based Si quantum dots. According to needs, the number of quantum dot laminated sub-batteries is 1, 2, 3, ..., up to n. The battery material adopts Si and SiO 2 , which is rich in resources ...

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Abstract

The invention relates to a cascade solar cell with a nano rod array optical coupling element, belonging to the technical field of solar cells. The cascade solar cell with the nano rod array optical coupling element is that: ZnO, TiO2 and SiO2 nano rod arrays which are vertical are adopted as an upper cell, a middle cell and a lower cell which form the cascade solar cell with the optical coupling element; wherein the lower cell is a conventional Si cell with 1.1eV of band gap, the upper and lower cells are Si quantum dot cells with 2eV and 1.5eV band gaps respectively, and the corresponding Si quantum dot size is 20-40nm and 65-85nm respectively; wherein the quantum dots adopt Si, Ge and Sn quantum dots which take SiO2, Si3N4 and Sic as ground substances, and the number of the cascade solar cells can be from one to n. The cascade solar cell has the advantages that the absorption efficiency and conversion efficiency of solar spectrum of the solar cell are improved radically, the photo-electricity conversion efficiency of the solar cell can be effectively improved, the preparation process is simple and the manufacturing cost is low.

Description

Technical field: [0001] The invention relates to a laminated solar cell with a nanorod array optical coupling element, which belongs to the technical field of solar cells. Background technique: [0002] High-efficiency solar cells have always been one of the hotspots in the field of photovoltaic research. There are two main factors that limit the photoelectric conversion efficiency of solar cells. One is that the spectral response should be effective light, but energy loss occurs due to the reflection on the surface of the solar cell; the other is that the spectral response of the solar cell does not match the solar spectrum, resulting in energy loss. That is, photons below the energy gap are not absorbed, and photons above the energy gap lose excess energy in the form of lattice thermal vibration. In order to reduce energy loss, high-efficiency solar cells need to develop two major technologies: (1) technology to efficiently introduce sunlight into the energy conversion ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/042H01L31/0232H01L31/046H01L31/054
CPCY02E10/50Y02E10/52
Inventor 杨培志刘黎明郝瑞亭杨雯莫镜辉邓书康
Owner YUNNAN NORMAL UNIV
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