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Influence of Perovskite Interface Morphology on the Photon Management in Perovskite/Silicon Tandem Solar Cells
摘要： Perovskite/silicon tandem solar cells are considered as one of the cost-effective solutions for determining high energy conversion efficiencies. Efficient photon management allows improving light incoupling in the solar cells by reducing optical losses. The optics relies upon the interface morphology, consequently, the growth mechanism of the top cell on the bottom cell is crucial for the implementation of efficient perovskite/silicon tandem solar cells. To describe the interface morphologies of perovskite/silicon tandem solar cells, a three-dimensional surface algorithm is used that allows investigating the perovskite solar cells deposited on the textured crystalline silicon solar cells. We distinguish between two extreme cases in which the film grows only in the direction of the substrate normal or in the direction of the local surface normal. The growth mode has a significant influence on the film roughness, the effective thickness of the film, the optics of the solar cell, and the photovoltaic parameters. The optics is investigated by finite-different time-domain simulations. The influence of the interface morphology on the photovoltaic parameters is discussed and guidelines are provided to reach high short-circuit current density and energy conversion efficiency.
关键词： photon management,light trapping,tandem solar cell,realistic interface morphology,Perovskite
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Photon Management for Silicon Solar Cells featuring Hole-Selective Molybdenum Oxide Rear Contacts: An Optical Simulation Study
摘要： Passivated, hole-selective contacts play important role in reducing surface recombination by lowering the concentration of electrons in the rear side of a solar cell. However, parasitic optical losses in these contacts can still limit the performance of the cell. In this work, the long wavelength optical losses of silicon solar cells featuring hole-selective molybdenum oxide (MoOx) rear contacts are investigated using optical simulations. The potential of these selective contacts for possible enhancement of photogenerated current density was also investigated for their use with nanostructured dielectric layers.
关键词： photon management,FDTD simulation,grating nanostructure,silicon solar cell,hole selective contact
更新于2025-09-16 10:30:52
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Photonic enhancement of parallel homo-tandem solar cells through the central electrode
摘要： Improvement of solar cell performance through the parallel homo-tandem architecture is studied. The cell geometry is optically designed to maximize absorption of the AM1.5 spectrum. We consider both ITO electrode and a recently devised ITO-free alternative, the Two-Resonance Tapping Cavity. The optimal geometry strongly depends on this choice. We identify two mechanisms by which tandem cells outperform single cells: (i) back-up absorption and (ii) interferometric gain mediated by the central metallic electrode. We numerically demonstrate large improvement in short-circuit current for a wide choice of realistic materials: PTB7-th:PC71BM, P3HT:PC61BM, DBP:C70, and methylammonium lead halide perovskite, as well as a theoretical material with a Shockley-Queiser type of spectral absorption plus an Urbach tail. Such an idealized response is found to reliably model real materials. A general response pattern is found that fits all the cases covered in our study, and which can serve as a guide to optimize homo-tandem cells.
关键词： Homo-tandem solar cells,ITO,TRTC,Photon management,Micro-cavity
更新于2025-09-11 14:15:04
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Photon Management in Perovskite Solar Cells
摘要： Metal-halide perovskites as absorber materials for solar cells have captured the attention of an increasing number of scientists over the last years. As is common for most photovoltaic technologies, early stages of solar cell development were dedicated to understanding and tuning the properties of materials and interfaces in the perovskite-based solar cells to ensure efficient charge separation and suppress unwanted recombination channels. However, when photovoltaic technologies become more mature, the design of optical properties of materials, interfaces, and complete device stacks becomes increasingly important in order to come even closer to the efficiency limits dictated by thermodynamics. This Viewpoint is dedicated to briefly discuss how photons can be absorbed more efficiently, be reused, be distributed between different cells in tandem devices, and finally be used as a means to characterize the electronic properties of materials and interfaces. More detailed discussions of these topics can then be found in a series of Perspective articles on topics related to the optical properties and the optical design of perovskite-based solar cells that are introduced in this Viewpoint.
关键词： optical design,photovoltaic technologies,perovskite solar cells,efficiency limits,photon management
更新于2025-09-11 14:15:04