Maximizing tandem solar cell power extraction using a three-terminal design,Sustainable Energy & Fuels

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Maximizing tandem solar cell power extraction using a three-terminal design
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-04-09 , DOI: 10.1039/c8se00133b
Emily L. Warren _{1,

2} , Michael G. Deceglie _{1,

2} , Michael Rienäcker _{3,

4} , Robby Peibst _{3,

4} , Adele C. Tamboli _{1,

2} , Paul Stradins _{1,

2}

Affiliation

Tandem or multijunction solar cells can greatly increase the efficiency of solar energy conversion by absorbing different energies of the incident solar illumination in semiconductors with different band-gaps, which can operate more efficiently than a single absorber. Many different designs of tandem cells based on high efficiency top cells and Si bottom cells have been proposed, and there is ongoing debate as to whether the sub-cells should be wired in series (to create a tandem device with two terminals) or operated independently (four terminals). An alternative cell configuration that combines some of the strengths of both is a three-terminal device consisting of a top cell optically in series with a modified interdigitated back contact (IBC) Si cell featuring a conductive top contact. Such a configuration can enable improved energy yield while only requiring external wiring on the front and back of the solar cell stack. In this paper, we investigate the operation of three terminal tandems in detail using technology computer aided design (TCAD) device physics simulations. Using III–V top cells as an example case, we show how the addition of a third terminal can deliver comparable power output to a four terminal device, and substantially more power than a two-terminal device, while also enabling power injection and extraction between the two sub-circuits under a variety of spectral conditions.

中文翻译：

使用三端子设计最大化串联太阳能电池的功率提取

串联或多结太阳能电池可以通过吸收具有不同带隙的半导体中入射太阳照明的不同能量来大大提高太阳能转换的效率，与单个吸收器相比，这种能量可以更有效地工作。已经提出了基于高效顶部电池和硅底部电池的串联电池的许多不同设计，并且关于子电池应串联连接（以创建具有两个端子的串联设备）还是独立运行的争论不断。（四个终端）。结合了两者优势的另一种电池配置是三端设备，该设备由一个顶部电池和一个以导电顶部接触为特征的改进型叉指背接触（IBC）Si电池光学串联而成。这样的配置可以提高能量产量，同时仅需要在太阳能电池堆的正面和背面上的外部布线。在本文中，我们使用技术计算机辅助设计（TCAD）设备物理模拟详细研究了三个终端设备的操作。以III–V顶部电池为例，我们展示了如何添加第三个端子可以向四端子设备提供可比较的功率输出，并且比两端子设备提供更多的功率，同时还可以实现之间的功率注入和提取两个子电路在各种光谱条件下。

更新日期：2018-05-30

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