Three-Terminal Perovskite/Silicon Tandem Solar Cells with Top and Interdigitated Rear Contacts,ACS Applied Energy Materials

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Three-Terminal Perovskite/Silicon Tandem Solar Cells with Top and Interdigitated Rear Contacts
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-15 00:00:00 , DOI: 10.1021/acsaem.9b01800
Philipp Tockhorn ₁ , Philipp Wagner _{1,

2} , Lukas Kegelmann ₃ , Johann-Christoph Stang ₁ , Mathias Mews ₁ , Steve Albrecht _{3,

4} , Lars Korte ₁

Affiliation

We present a three-terminal (3T) tandem approach for the interconnection of a perovskite top cell with an interdigitated back-contact (IBC) silicon heterojunction (SHJ) bottom cell. The general viability of our cell design is verified with drift-diffusion simulations indicating efficient charge carrier transport throughout the whole device and an efficiency potential of ≈27% by using readily available absorber and contact materials. Our experimental proof-of-concept device reaches a combined PCE of 17.1% when both subcells are operating at their individual maximum power point. To emulate different operation conditions, the current–voltage characteristics of both cells were obtained by measuring one subcell while the other cell was set to a fixed bias voltage. Only a slight mutual dependence of both subcells was found. As determined by electrical simulations, this dependence likely stems from the resistance of the electron contact on the cell’s rear side, which is shared by both subcells. The optimization of this contact turns out to be a major design criterion for IBC 3T tandems. We demonstrate that our current proof-of-concept cells are limited by this series resistance as well as by optical losses, and we discuss pathways to approach the simulated efficiency potential by an optimized device design.

中文翻译：

三端子钙钛矿/硅串联太阳能电池，顶部和叉指后触点

我们提出了一种三端（3T）串联方法，用于钙钛矿顶部电池与叉指式背接触（IBC）硅异质结（SHJ）底部电池的互连。我们的电池设计的总体生存能力已通过漂移扩散仿真进行了验证，该仿真表明通过使用随时可用的吸收剂和接触材料，电荷载流子在整个器件中的传输效率很高，效率潜力约为27％。当两个子电池都在各自的最大功率点下工作时，我们的实验性概念验证设备的组合PCE达到17.1％。为了模拟不同的工作条件，通过测量一个子电池获得了两个电池的电流-电压特性，而另一个电池被设置为固定的偏置电压。发现两个子电池之间只有轻微的相互依赖性。如电模拟所确定的，这种依赖性可能源于电池背面的电子接触电阻，两个子电池都共享该电阻。事实证明，这种接触的优化是IBC 3T座舱的主要设计标准。我们证明了我们当前的概念验证单元受到该串联电阻以及光损耗的限制，并且我们讨论了通过优化的器件设计来接近模拟效率潜力的途径。

更新日期：2020-01-15

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