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Design of Perovskite/Crystalline-Silicon Tandem Solar Cells
S. Altazin, L. Stepanova, K. Lapagna, P. Losio, J. Werner, B. Niesen, A. Dabirian, M. Morales-Masis, S. de Wolf, C. Ballif, B. Ruhstaller
Thin Film Solar Cells and Modules
Subtopic: Perovskite, Organic and Hybrid devices
Event: 32nd European Photovoltaic Solar Energy Conference and Exhibition
Session: 3DV.2.2
1276 - 1279
ISBN: 3-936338-41-8
Paper DOI: 10.4229/EUPVSEC20162016-3DV.2.2
0,00 EUR
Document(s): paper


While the efficiency of silicon heterojunction solar cells has surpassed 25%, a novel route to highefficiency wafer-based solar cells is being pursued with perovskite/silicon tandems, with monolithic devices having reached 21.2% [3] and 4- terminal measurements approaching 25% [9] with potential to come close to 30% efficiency. In this context we introduce a simulation tool that combines a 3D raytracing algorithm with thin film optics to study light interaction with conformally coated layers on planar and textured silicon wafers. After validating the model with experimental data we employ it for demonstrating further efficiency improvements that can be achieved with a rear-side random pyramid texture and an anti-reflection foil in the front. The simulations show that the light scattering introduced by the rear-side texture and the anti-reflection foil mainly enhances the photocurrent of the silicon heterojunction cell by 1.4 mA/cm2 and 2.2 mA/cm2, respectively. With additional adjustment of some layer thicknesses we thus conclude that the overall current enhancement can be as high as 3.9 mA/cm2, corresponding to a relative boost of about 30% in current density and thus expected power conversion efficiency. Eventually such approaches should provide guidelines on how to further improve the efficiency of perovskite/silicon tandem cells.