Abstract
Monolithic perovskite/c-Si tandem solar cells have the potential to exceed the Shockley-Queisser limit for single junction solar cells. However, reflection losses at internal interfaces play a crucial role for the overall efficiency of the tandem devices. Significant reflection losses are caused by the charge selective contacts which have a significantly lower refractive index compared to the absorber materials. Here, we present an approach to overcome a significant part of these reflection losses by introducing a multilayer stack between the top and bottom cell which shows spectrally selective transmission/reflection behavior. The layer stack is designed and optimized by optical simulations using transfer matrix method and a genetic algorithm. The incident sun light is split into a direct part and an isotropic diffuse part. The tandem solar cell with interlayer shows an absolute improvement of short-circuit current density of 0.82 mA/cm2.
Highlights
The rapid increase in power conversion efficiency of metal halide perovskite solar cells (PSC) [1,2,3,4] and their high optical band-gap make these devices to attractive candidates for top cells for crystalline silicon (c-Si) solar cell technology [5,6,7,8,9]
We focus our study to Silicon heterojunction (SHJ) bottom solar cells applying hydrogenated amorphous silicon passivation layers and doped hydrogenated, nanocrystalline silicon oxide charge carrier selective contacts as such layers have a high optical transparency and the solar cells reveal reasonably high efficiencies [35]
We will demonstrate that reflection losses in the spectral range from 600 nm – 900 nm play a major role in the limitation of the device
Summary
The rapid increase in power conversion efficiency of metal halide perovskite solar cells (PSC) [1,2,3,4] and their high optical band-gap make these devices to attractive candidates for top cells for crystalline silicon (c-Si) solar cell technology [5,6,7,8,9]. The four-terminal device allows that both cells can be individually driven at their respective maximum power point, whereas current matching has to be taken into account for the two-terminal concept. From an optical point of view, one has to take care about any layer between the top cell absorber and the bottom cell absorber for both tandem device concepts to achieve a good optical matching. Layers with refractive indices significantly lower than those of the absorber layers cause reflection losses for light with photon energies lower than the band gap of the top cell absorber [15,23,24]
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