Arnaud Walter
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View article: Synergetic substrate and additive engineering for over 30%-efficient perovskite-Si tandem solar cells
Synergetic substrate and additive engineering for over 30%-efficient perovskite-Si tandem solar cells Open
Perovskite-silicon (Si) tandem solar cells are the most prominent contenders to succeed single-junction Si cells that dominate the market today. Yet, to justify the added cost of inserting a perovskite cell on top of Si, these devices shou…
View article: High-efficiency (>30%) monolithic perovskite-Si tandem solar cells with flat front-side wafers
High-efficiency (>30%) monolithic perovskite-Si tandem solar cells with flat front-side wafers Open
Perovskite-Si tandem solar cells are the most prominent contenders to succeed commercial single-junction Si cells that dominate the market today. Yet, to justify the added cost of inserting a perovskite cell on top of Si, the tandem device…
View article: Understanding and Mitigating the Degradation of Perovskite Solar Cells Based on a Nickel Oxide Hole Transport Material during Damp Heat Testing
Understanding and Mitigating the Degradation of Perovskite Solar Cells Based on a Nickel Oxide Hole Transport Material during Damp Heat Testing Open
The development of stable materials, processable on a large area, is a prerequisite for perovskite industrialization. Beyond the perovskite absorber itself, this should also guide the development of all other layers in the solar cell. In t…
View article: Rear textured p-type high temperature passivating contacts and their implementation in perovskite/silicon tandem cells
Rear textured p-type high temperature passivating contacts and their implementation in perovskite/silicon tandem cells Open
High temperature passivating p-type contacts on textured surfaces with i V OC up to 725 mV and contact resistance below 90 mΩ cm 2 . 28.25% tandem PK/c-Si solar cells rear side textured with high temperature passivating contacts.
View article: Understanding the Formation Process of Perovskite Layers Grown by Chemical Vapour Deposition
Understanding the Formation Process of Perovskite Layers Grown by Chemical Vapour Deposition Open
This work aims at extending the understanding of the formation processes of (Cs 0.07 FA 0.93 )PbI 3 perovskite layers deposited by a two-step vapour method. In a first step, an inorganic CsI/PbI 2 precursor stack is deposited by thermal ev…
View article: Towards unification of perovskite stability and photovoltaic performance assessment
Towards unification of perovskite stability and photovoltaic performance assessment Open
With the rapid progress of perovskite photovoltaics (PV), further challenges arise to meet meet the minimum standards required for commercial deployment. Along with the push towards higher efficiencies, we identify a need to improve the qu…
View article: Instability of p–i–n perovskite solar cells under reverse bias
Instability of p–i–n perovskite solar cells under reverse bias Open
The mechanisms controlling the degradation of p–i–n perovskite solar cells in reverse bias are identified using various optoelectronic and microstructural characterization techniques.
View article: Improved FTO/NiO<sub>x</sub> Interfaces for Inverted Planar Triple-Cation Perovskite Solar Cells
Improved FTO/NiO<sub>x</sub> Interfaces for Inverted Planar Triple-Cation Perovskite Solar Cells Open
Front electrodes of fluorine doped tin oxide (FTO) thin films and hole transporting layers of nickel oxide thin films have been combined to fabricate 1.063 cm2 inverted planar solar cells with cesium-containing triple cation perovskites as…
View article: Low-Temperature Screen-Printed Metallization for the Scale-Up of Two-Terminal Perovskite–Silicon Tandems
Low-Temperature Screen-Printed Metallization for the Scale-Up of Two-Terminal Perovskite–Silicon Tandems Open
Tandem photovoltaic devices based on perovskite and crystalline silicon (PK/c-Si) absorbers have the potential to push commercial silicon single junction devices beyond their current efficiency limit. However, their scale-up to industriall…
View article: Perovskite/Perovskite/Silicon Monolithic Triple-Junction Solar Cells with a Fully Textured Design
Perovskite/Perovskite/Silicon Monolithic Triple-Junction Solar Cells with a Fully Textured Design Open
High efficiency triple-junction solar cells are currently made of III−V semiconductors using expensive deposition methods. Perovskite/perovskite/silicon monolithic triple-junction solar cells could be a lower-cost alternative as no epitaxi…
View article: Hybrid sequential deposition process for fully textured perovskite/silicon tandem solar cells
Hybrid sequential deposition process for fully textured perovskite/silicon tandem solar cells Open
Tandem solar cells that feature a high-bandgap perovskite cell on top of a lower bandgap silicon cell have the potential to reach efficiencies > 30%. Here, we present a versatile hybrid deposition method that yields conformal perovskite ce…
View article: Complex Refractive Indices of Cesium–Formamidinium-Based Mixed-Halide Perovskites with Optical Band Gaps from 1.5 to 1.8 eV
Complex Refractive Indices of Cesium–Formamidinium-Based Mixed-Halide Perovskites with Optical Band Gaps from 1.5 to 1.8 eV Open
Cesium-formamidinium-based mixed-halide perovskite materials with optical band gaps ranging from 1.5 to 1.8 eV are investigated by variable-angle spectroscopic ellipsometry. The determined complex refractive indices are shown to depend on …
View article: Roll to roll atmospheric pressure plasma enhanced CVD of titania as a step towards the realisation of large area perovskite solar cell technology
Roll to roll atmospheric pressure plasma enhanced CVD of titania as a step towards the realisation of large area perovskite solar cell technology Open
Highly effective TiO2−x electron transport layers produced by continuous atmospheric pressure PECVD achieve efficiency gains in mesoporous perovskite photovoltaic cells.
View article: Closing the Cell-to-Module Efficiency Gap: A Fully Laser Scribed Perovskite Minimodule With 16% Steady-State Aperture Area Efficiency
Closing the Cell-to-Module Efficiency Gap: A Fully Laser Scribed Perovskite Minimodule With 16% Steady-State Aperture Area Efficiency Open
Organic-inorganic halide perovskite solar cells show increasing power conversion efficiencies, approaching the values of silicon-based devices. To date, however, most of the reported record efficiencies for perovskite solar devices are obt…
View article: 1 cm<sup>2</sup> CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> mesoporous solar cells with 17.8% steady-state efficiency by tailoring front FTO electrodes
1 cm<sup>2</sup> CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> mesoporous solar cells with 17.8% steady-state efficiency by tailoring front FTO electrodes Open
Fluorine doped tin oxide films deposited by atmospheric-pressure chemical vapour deposition demonstrated power conversion efficiencies of 17.8% for mesoporous perovskite solar cells.
View article: Zinc tin oxide as high-temperature stable recombination layer for mesoscopic perovskite/silicon monolithic tandem solar cells
Zinc tin oxide as high-temperature stable recombination layer for mesoscopic perovskite/silicon monolithic tandem solar cells Open
Perovskite/crystalline silicon tandem solar cells have the potential to reach efficiencies beyond those of silicon single-junction record devices. However, the high-temperature process of 500 °C needed for state-of-the-art mesoscopic perov…
View article: Efficient Near-Infrared-Transparent Perovskite Solar Cells Enabling Direct Comparison of 4-Terminal and Monolithic Perovskite/Silicon Tandem Cells
Efficient Near-Infrared-Transparent Perovskite Solar Cells Enabling Direct Comparison of 4-Terminal and Monolithic Perovskite/Silicon Tandem Cells Open
Combining market-proven silicon solar cell technology with an efficient wide band gap top cell into a tandem device is an attractive approach to reduce the cost of photovoltaic systems. For this, perovskite solar cells are promising high-e…
View article: Progression towards high efficiency perovskite solar cells via optimisation of the front electrode and blocking layer
Progression towards high efficiency perovskite solar cells via optimisation of the front electrode and blocking layer Open
Tailoring the properties of F-doped tin oxide, titanium dioxide and perovskite to lead to solar cells with efficiencies >16%.
View article: Efficient Monolithic Perovskite/Silicon Tandem Solar Cell with Cell Area >1 cm<sup>2</sup>
Efficient Monolithic Perovskite/Silicon Tandem Solar Cell with Cell Area >1 cm<sup>2</sup> Open
Monolithic perovskite/crystalline silicon tandem solar cells hold great promise for further performance improvement of well-established silicon photovoltaics; however, monolithic tandem integration is challenging, evidenced by the modest p…
View article: Sputtered rear electrode with broadband transparency for perovskite solar cells
Sputtered rear electrode with broadband transparency for perovskite solar cells Open
Due to their high efficiencies combined with simple and cost-effective device fabrication, perovskite solar cells are promising candidates as top cells in tandem devices. For this application, the perovskite solar cell must be highly trans…
View article: Laser-Scribing Patterning for the Production of Organometallic Halide Perovskite Solar Modules
Laser-Scribing Patterning for the Production of Organometallic Halide Perovskite Solar Modules Open
Efficiencies of solar cells based on organometallic halide perovskite absorber material have dramatically increased over the past few years. Most of efficiencies reported so far have, however, been obtained on solar cells with very small l…
View article: The Role of Transport Agents in MoS<sub>2</sub> Single Crystals
The Role of Transport Agents in MoS<sub>2</sub> Single Crystals Open
We report resistivity, thermoelectric power, and thermal conductivity of MoS2 single crystals prepared by the chemical vapor transport (CVT) method using I-2, Br-2, and TeCl4 as transport agents. The material presents low-lying donor and a…
View article: Towards Ultra-High Efficient Photovoltaics with Perovskite / Crystalline Silicon Tandem Devices
Towards Ultra-High Efficient Photovoltaics with Perovskite / Crystalline Silicon Tandem Devices Open
Perovskite/crystalline silicon tandem solar cells are one of the most promising approaches to reach conversion efficiencies beyond 30% at reasonable costs. In the present paper, we present our research directions and recent results. This i…