Hitoshi Sai
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View article: Monolithic Perovskite/Silicon Tandem Solar Cells Enabled by Multifunctional TiO <sub>x</sub> Interconnects
Monolithic Perovskite/Silicon Tandem Solar Cells Enabled by Multifunctional TiO <sub>x</sub> Interconnects Open
Perovskite‐on‐silicon tandem solar cells have emerged as a leading technology enabling high power conversion efficiencies (PCE) over 30%. Despite current progress, the intrinsic multilayer device design presents vast challenges in complexi…
View article: Optics for Terawatt-Scale Photovoltaics – Review and Perspectives
Optics for Terawatt-Scale Photovoltaics – Review and Perspectives Open
Photovoltaics—a mature technology—is set to play a vital role in achieving a carbon-free energy system. This article examines the pivotal role of optics in advancing photovoltaics. We identify key scientific research areas where the optics…
View article: Optics for Terawatt-Scale Photovoltaics – Review and Perspectives
Optics for Terawatt-Scale Photovoltaics – Review and Perspectives Open
Photovoltaics—a mature technology—is set to play a vital role in achieving a carbon-free energy system. This article examines the pivotal role of optics in advancing photovoltaics. We identify key scientific research areas where the optics…
View article: Optics for Terawatt-Scale Photovoltaics – Review and Perspectives
Optics for Terawatt-Scale Photovoltaics – Review and Perspectives Open
Photovoltaics—a mature technology—is set to play a vital role in achieving a carbon-free energy system. This article examines the pivotal role of optics in advancing photovoltaics. We identify key scientific research areas where the optics…
View article: Optics for terawatt-scale photovoltaics: review and perspectives
Optics for terawatt-scale photovoltaics: review and perspectives Open
Photovoltaics, a mature technology, is set to play a vital role in achieving a carbon-free energy system. This article examines the pivotal role of optics in advancing photovoltaics. We identify key scientific research areas where the opti…
View article: Symmetric Dopant‐Free Si Solar Cells Enabled by TiO<sub>x</sub> Nanolayers: An In‐Depth Study on Bipolar Carrier Selectivity
Symmetric Dopant‐Free Si Solar Cells Enabled by TiO<sub>x</sub> Nanolayers: An In‐Depth Study on Bipolar Carrier Selectivity Open
High‐efficiency solar cells require two contact structures, engineered for efficient extraction of photogenerated holes and electrons at the respective electrodes. Herein, crystalline Si solar cell featuring hole‐ and electron‐selective pa…
View article: Nanoscale Size Control of Si Pyramid Texture for Perovskite/Si Tandem Solar Cells Enabling Solution‐Based Perovskite Top‐Cell Fabrication and Improved Si Bottom‐Cell Response
Nanoscale Size Control of Si Pyramid Texture for Perovskite/Si Tandem Solar Cells Enabling Solution‐Based Perovskite Top‐Cell Fabrication and Improved Si Bottom‐Cell Response Open
A monolithic perovskite/silicon tandem solar cell architecture is employed to surpass the single‐junction efficiency limit. Recently, there is an increasing need for the double‐sided textures in the Si bottom cell to be compatible with the…
View article: Toward TCO‐Free Silicon Heterojunction Solar Cells: Effect of TCO Layers in Electrical Transport and Stability
Toward TCO‐Free Silicon Heterojunction Solar Cells: Effect of TCO Layers in Electrical Transport and Stability Open
The current silicon heterojunction (SHJ) cells utilize indium‐based transparent conductive oxide (TCO) layers for supporting the lateral carrier transport. However, In is a typical rare metal and its consumption in solar cell manufacturing…
View article: Quantitative evaluation of implied open-circuit voltage after metal electrode deposition on TiO<i> <sub>x</sub> </i>/Si heterostructures by photoluminescence imaging: impact of metallization on passivation performance
Quantitative evaluation of implied open-circuit voltage after metal electrode deposition on TiO<i> <sub>x</sub> </i>/Si heterostructures by photoluminescence imaging: impact of metallization on passivation performance Open
The degradation of surface passivation performance by metallization is a challenge in realizing highly efficient crystalline Si solar cells that use novel carrier-selective contacts. Here, we report on a simple method to study the effect o…
View article: Highly efficient color-control technique for building-integrated photovoltaics using optical dielectric thin film
Highly efficient color-control technique for building-integrated photovoltaics using optical dielectric thin film Open
A color-control technique based on optical thin films on glass is investigated by means of numerical simulation and experiment, with a particular focus on building-integrated photovoltaic (BIPV) applications. We show that white-colored BIP…
View article: The sputter deposition of broadband transparent and highly conductive cerium and hydrogen co‐doped indium oxide and its transfer to silicon heterojunction solar cells
The sputter deposition of broadband transparent and highly conductive cerium and hydrogen co‐doped indium oxide and its transfer to silicon heterojunction solar cells Open
Indium oxide doped with tin (ITO) is the most commonly used material for lateral transport window layers in silicon heterojunction (SHJ) solar cells, as it currently offers the best combination of physical properties, industrial deposition…
View article: Honeycomb micro-textures for light trapping in multi-crystalline silicon thin-film solar cells
Honeycomb micro-textures for light trapping in multi-crystalline silicon thin-film solar cells Open
The liquid phase crystallization (LPC) of silicon is an emerging technology for fabricating 10 - 20 µm thin multi-crystalline silicon layers on glass. LPC silicon solar cells exhibit similar electronic performance to multi-crystalline wafe…
View article: Plasmonic Color Filters Integrated on a Photodiode Array
Plasmonic Color Filters Integrated on a Photodiode Array Open
SUMMARY Arrayed plasmonic color filters integrated on Si photodiodes with 21 elements were experimentally demonstrated. The plasmonic color filters consisted of nanodot subwavelength periodic structures. Optical characteristics of the colo…
View article: Integration of Light Trapping Silver Nanostructures in Hydrogenated Microcrystalline Silicon Solar Cells by Transfer Printing
Integration of Light Trapping Silver Nanostructures in Hydrogenated Microcrystalline Silicon Solar Cells by Transfer Printing Open
One of the potential applications of metal nanostructures is light trapping in solar cells, where unique optical properties of nanosized metals, commonly known as plasmonic effects, play an important role. Research in this field has, howev…