Journal
NANOPHOTONICS
Volume 10, Issue 8, Pages 2043-2057Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0643
Keywords
bi-facial; c-Si; optical modelling; perovskite; photocurrent; tandem
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Funding
- NWO JSP III [680-91-011]
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Optical simulations can guide the enhancement of perovskite/c-Si tandem solar cells, with carrier selective passivating contacts showing potential for efficiency gains. Factors like albedo, perovskite thickness, band gap, and geographic location impact the optical performance of bi-facial perovskite/c-Si tandems. Thicker perovskite layers may be required for bi-facial tandems, especially when converting light from the rear, suggesting potential for lower bandgap perovskites in advanced tandems.
Since single junction c-Si solar cells are reaching their practical efficiency limit. Perovskite/c-Si tandem solar cells hold the promise of achieving greater than 30% efficiencies. In this regard, optical simulations can deliver guidelines for reducing the parasitic absorption losses and increasing the photocurrent density of the tandem solar cells. In this work, an optical study of 2, 3 and 4 terminal perovskite/c-Si tandem solar cells with c-Si solar bottom cells passivated by high thermal-budget poly-Si, poly-SiOx and poly-SiCx is performed to evaluate their optical performance with respect to the conventional tandem solar cells employing silicon heterojunction bottom cells. The parasitic absorption in these carrier selective passivating contacts has been quantified. It is shown that they enable greater than 20 mA/cm(2) matched implied photocurrent density in un-encapsulated 2T tandem architecture along with being compatible with high temperature production processes. For studying the performance of such tandem devices in real-world irradiance conditions and for different locations of the world, the effect of solar spectrum and angle of incidence on their optical performance is studied. Passing from mono-facial to bi-facial tandem solar cells, the photocurrent density in the bottom cell can be increased, requiring again optical optimization. Here, we analyse the effect of albedo, perovskite thickness and band gap as well as geographical location on the optical performance of these bi-facial perovskite/c-Si tandem solar cells. Our optical study shows that bi-facial 2T tandems, that also convert light incident from the rear, require radically thicker perovskite layers to match the additional current from the c-Si bottom cell. For typical perovskite bandgap and albedo values, even doubling the perovskite thickness is not sufficient. In this respect, lower bandgap perovskites are very interesting for application not only in bi-facial 2T tandems but also in related 3T and 4T tandems.
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