Abstract
Perovskite/silicon tandem modules have recently attracted growing interest as a potential candidate for new generations of solar modules. Combined with a bifacial configuration it can lead to considerable energy yield improvement in comparison to conventional monofacial tandem solar modules. Optical modeling is crucial to analyze the optical losses of perovskite/silicon solar modules and achieve efficient light management. In this article we study the optical properties of four-terminal bifacial tandem modules, using metal-halide perovskite top solar cell and a conventional industrial crystalline silicon PERC bottom solar cell. We propose a method to analyze bifacial gains, improve back side light management and challenge it under realistic spectral conditions at several locations with various albedos. We show that both optimized designs for the back side show comparable advantages at all locations. These results are a good sign for the standardization of bifacial four-terminal perovskite/silicon modules.
Highlights
Perovskite/silicon tandem modules have the potential to reach conversion efficiency around 40% [1], overcoming the Shockley-Queisser limit of single junction solar cell around 33% [2]
In this work we have shown that back light management is necessary in order to take advantage of albedo and surrounding conditions in perovskite/silicon tandem bifacial module
When considering bifacial modules, advantages of backside silicon texture are influenced by trade-off between light management of front and back illuminations, making the best device structure dependent on illumination conditions, especially albedo
Summary
Perovskite/silicon tandem modules have the potential to reach conversion efficiency around 40% [1], overcoming the Shockley-Queisser limit of single junction solar cell around 33% [2]. Four terminal tandem device is one of the configurations which does not require electrical matching, allows optimizing silicon and perovskite cells independently, and is less affected by outdoor conditions than monolithic tandem modules [3,4,5]. This leads to more flexibility in the design of the device, but with losses such as parasitic absorption of the transparent conductive layers. Additional gains are possible by using perovskite/silicon tandem module in a bifacial configuration [12,13,14,15]. There have been few works on optical modeling of bifacial four-terminal configuration considering a full module stack, including spectral contributions
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