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    Multi-junction photovoltaic cell having wide bandgap oxide conductor between subcells and method of making same
    2.
    发明授权
    Multi-junction photovoltaic cell having wide bandgap oxide conductor between subcells and method of making same 有权

    公开(公告)号：US12191415B2

    公开(公告)日：2025-01-07

    申请号：US16396495

    申请日：2019-04-26

    Applicant: California Institute of Technology

    Inventor： Stefan Omelchenko ,  Sisir Yalamanchili ,  Nathan S Lewis

    IPC: H01L31/0725 ,  H01L31/0216 ,  H01L31/0288 ,  H01L31/18

    Abstract: Increasing the power conversion efficiency of silicon (Si) photovoltaics is a key enabler for continued reductions in the cost of solar electricity. Disclosed herein is a multi-junction photovoltaic cell that does not utilize a conventional interconnection layer and instead places a wide bandgap oxide conductor, for example, a metal oxide such as TiO2, between a top light absorption layer having a relatively large bandgap and a bottom light absorption layer having a relatively small bandgap. The advantageous omission of a conventional interconnection layer between the two subcells is enabled by low contact resistivity between the top and bottom light absorbing layers provided by the wide bandgap oxide conductor. The absence of the conventional interconnect between the subcells significantly reduces both optical losses and processing steps. The disclosed photovoltaic cell may thus enable low-cost, high-efficiency multi-junction devices through less complex manufacturing processes and lower material costs.

    MULTI-JUNCTION PHOTOVOLTAIC CELL HAVING WIDE BANDGAP OXIDE CONDUCTOR BETWEEN SUBCELLS AND METHOD OF MAKING SAME
    3.
    发明申请
    MULTI-JUNCTION PHOTOVOLTAIC CELL HAVING WIDE BANDGAP OXIDE CONDUCTOR BETWEEN SUBCELLS AND METHOD OF MAKING SAME 审中-公开

    公开(公告)号：US20190334048A1

    公开(公告)日：2019-10-31

    申请号：US16396495

    申请日：2019-04-26

    Applicant: California Institute of Technology

    Inventor： Stefan Omelchenko ,  Sisir Yalamanchili ,  Nathan S. Lewis

    IPC: H01L31/0725 ,  H01L31/0288 ,  H01L31/0216 ,  H01L31/18

    Abstract: Increasing the power conversion efficiency of silicon (Si) photovoltaics is a key enabler for continued reductions in the cost of solar electricity. Disclosed herein is a multi-junction photovoltaic cell that does not utilize a conventional interconnection layer and instead places a wide bandgap oxide conductor, for example, a metal oxide such as TiO2, between a top light absorption layer having a relatively large bandgap and a bottom light absorption layer having a relatively small bandgap. The advantageous omission of a conventional interconnection layer between the two subcells is enabled by low contact resistivity between the top and bottom light absorbing layers provided by the wide bandgap oxide conductor. The absence of the conventional interconnect between the subcells significantly reduces both optical losses and processing steps. The disclosed photovoltaic cell may thus enable low-cost, high-efficiency multi-junction devices through less complex manufacturing processes and lower material costs.

    Solar Cells and Methods of Manufacturing Solar Cells Incorporating Effectively Transparent 3D Contacts
    5.
    发明申请
    Solar Cells and Methods of Manufacturing Solar Cells Incorporating Effectively Transparent 3D Contacts 审中-公开
    太阳能电池和太阳能电池的制造方法

    公开(公告)号：US20160322514A1

    公开(公告)日：2016-11-03

    申请号：US15144807

    申请日：2016-05-02

    Applicant: California Institute of Technology

    Inventor： Harry A. Atwater ,  Rebecca Saive ,  Aleca M. Borsuk ,  Hal Emmer ,  Colton Bukowsky ,  Sisir Yalamanchili

    IPC: H01L31/02 ,  H01L31/18 ,  H01L31/0232

    CPC classification number: H01L31/022425 ,  H01L31/043 ,  H01L31/0547 ,  H01L31/0747 ,  Y02E10/52

    Abstract: Solar cells in accordance with a number of embodiments of the invention incorporate effectively transparent 3D contacts that redirect light incident on the contacts onto the photoabsorbing surfaces of the solar cells. One embodiment includes a photoabsorbing surface and a plurality of three-dimensional contacts formed on the photoabsorbing surface. The plurality of three-dimensional contacts are spaced apart so that radiation is incident on a portion of the photoabsorbing surface. In addition, the three-dimensional contacts include at least one surface that redirects radiation incident on the three-dimensional contacts onto the photoabsorbing surface. Processes for manufacturing solar cells in accordance with many embodiments of the invention include: fabricating prototype three-dimensional contacts; forming a master structure for use in a gravure printing process using the prototype three-dimensional contacts; and forming three-dimensional contacts using a printing material formed on a substrate material using the master structure in a gravure printing process.

    Abstract translation: 根据本发明的多个实施例的太阳能电池将有效透明的3D触点引入，该触点将入射到触点上的光重定向到太阳能电池的光吸收表面上。 一个实施例包括光吸收表面和形成在光吸收表面上的多个三维触点。 多个三维触点间隔开，使得辐射入射到光吸收表面的一部分上。 此外，三维触点包括将入射到三维触点上的辐射重定向到光吸收表面的至少一个表面。 根据本发明的许多实施例的用于制造太阳能电池的方法包括：制造原型三维接触; 形成用于使用原型三维触点的凹版印刷工艺中的主结构; 以及使用在凹版印刷工艺中使用主结构的在基材上形成的印刷材料形成三维接触。

    Fabrication processes for effectively transparent contacts
    7.
    发明授权
    Fabrication processes for effectively transparent contacts 有权

    公开(公告)号：US10700234B2

    公开(公告)日：2020-06-30

    申请号：US15999264

    申请日：2018-08-17

    Applicant: California Institute of Technology

    Inventor： Rebecca Saive ,  Harry A. Atwater ,  Sisir Yalamanchili ,  Colton Bukowsky ,  Thomas Russell

    IPC: H01L21/00 ,  H01L31/18 ,  H01L31/0224

    Abstract: In conventional solar cells with metal contacts, a non-negligible fraction of the incoming solar power is immediately lost either through absorption or reflection upon interaction with the contacts. Effectively transparent contacts (“ETCs”) for solar cells can be referred to as three-dimensional contacts designed to redirect incoming light onto a photoabsorbing surface of a solar cell. In many embodiments, the ETCs have triangular cross-sections. Such ETCs can be placed on a photoabsorbing surface such that at least one of their sides forms an angle with the photoabsorbing surface. In this configuration, the ETCs can redirect incident light onto the photoabsorbing surface, mitigating or eliminating reflection loss compared to conventional solar cells. When constructed in accordance with a number of embodiments of the invention, ETCs can be effectively transparent and highly conductive.

    Fabrication Processes for Effectively Transparent Contacts
    8.
    发明申请
    Fabrication Processes for Effectively Transparent Contacts 审中-公开

    公开(公告)号：US20200152821A1

    公开(公告)日：2020-05-14

    申请号：US16745233

    申请日：2020-01-16

    Applicant: California Institute of Technology

    Inventor： Rebecca Saive ,  Harry A. Atwater ,  Sisir Yalamanchili ,  Colton Bukowsky ,  Thomas Russell

    IPC: H01L31/18 ,  H01L31/0224

    Abstract: In conventional solar cells with metal contacts, a non-negligible fraction of the incoming solar power is immediately lost either through absorption or reflection upon interaction with the contacts. Effectively transparent contacts (“ETCs”) for solar cells can be referred to as three-dimensional contacts designed to redirect incoming light onto a photoabsorbing surface of a solar cell. In many embodiments, the ETCs have triangular cross-sections. Such ETCs can be placed on a photoabsorbing surface such that at least one of their sides forms an angle with the photoabsorbing surface. In this configuration, the ETCs can redirect incident light onto the photoabsorbing surface, mitigating or eliminating reflection loss compared to conventional solar cells. When constructed in accordance with a number of embodiments of the invention, ETCs can be effectively transparent and highly conductive.

    Fabrication processes for effectively transparent contacts
    9.
    发明申请
    Fabrication processes for effectively transparent contacts 审中-公开

    公开(公告)号：US20190074401A1

    公开(公告)日：2019-03-07

    申请号：US15999264

    申请日：2018-08-17

    Applicant: California Institute of Technology

    Inventor： Rebecca Saive ,  Harry A. Atwater ,  Sisir Yalamanchili ,  Colton Bukowsky ,  Thomas Russell

    IPC: H01L31/18 ,  H01L31/0224

    Abstract: In conventional solar cells with metal contacts, a non-negligible fraction of the incoming solar power is immediately lost either through absorption or reflection upon interaction with the contacts. Effectively transparent contacts (“ETCs”) for solar cells can be referred to as three-dimensional contacts designed to redirect incoming light onto a photoabsorbing surface of a solar cell. In many embodiments, the ETCs have triangular cross-sections. Such ETCs can be placed on a photoabsorbing surface such that at least one of their sides forms an angle with the photoabsorbing surface. In this configuration, the ETCs can redirect incident light onto the photoabsorbing surface, mitigating or eliminating reflection loss compared to conventional solar cells. When constructed in accordance with a number of embodiments of the invention, ETCs can be effectively transparent and highly conductive.

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