A5001398340- Perovskite Materials and Applications
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Thin-Film Transistor Technologies
- Silicon and Solar Cell Technologies
- Solid-state spectroscopy and crystallography
- Silicon Nanostructures and Photoluminescence
- Organic Light-Emitting Diodes Research
- Advanced battery technologies research
- solar cell performance optimization
École Polytechnique Fédérale de Lausanne
2022-2025
Laboratoire d'Informatique Fondamentale de Lille
2023
Swiss Center for Electronics and Microtechnology (Switzerland)
2022
Swiss Federal Laboratories for Materials Science and Technology
2020
Turkish Atomic Energy Authority
2020
Silicon solar cells are approaching their theoretical efficiency limit of 29%. This limitation can be exceeded with advanced device architectures, where two or more stacked to improve the harvesting energy. In this work, we devise a tandem perovskite layer conformally coated on silicon bottom cell featuring micrometric pyramids—the industry standard—to its photocurrent. Using an additive in processing sequence, regulate crystallization process and alleviate recombination losses occurring at...
Perovskite-silicon (Si) tandem solar cells are the most prominent contenders to succeed single-junction Si that dominate market today. Yet, justify added cost of inserting a perovskite cell on top Si, these devices should first exhibit sufficiently high power conversion efficiencies (PCEs). Here, we present two key developments with synergetic effect boost PCEs our front-side flat wafers—the use 2,3,4,5,6-pentafluorobenzylphosphonic acid (pFBPA) in precursor ink suppresses recombination near...
Abstract The primary performance limitation in inverted perovskite‐based solar cells is the interface between fullerene‐based electron transport layers and perovskite. Atomic layer deposited thin aluminum oxide (AlO X ) interlayers that reduce nonradiative recombination at perovskite/C 60 are developed, resulting >60 millivolts improvement open‐circuit voltage 1% absolute power conversion efficiency. Surface‐sensitive characterizations indicate presence of a thin, conformally AlO x layer,...
The migration of mobile ions in the plane substrate is shown to have important effects on device behaviour and stability, especially near electrode boundaries.
Tin fluoride (SnF2) is an indispensable additive for high-efficiency Pb-Sn perovskite solar cells (PSCs). However, the spatial distribution of SnF2 in absorber seldom investigated while essential a comprehensive understanding exact role additive. Herein, we revealed and made structure-optoelectronic properties-flexible photovoltaic performance correlation. We observed chemical transformation to fluorinated oxy-phase on film surface due its rapid oxidation. In addition, at buried interface,...
Infrared light management is crucial to maximize the optical performance of crystalline Si‐based single junction and tandem solar cells. For this end, a low refractive index dielectric typically inserted under rear metal an electrical contact obtained locally through dielectric. However, realization such architecture can require numerous fabrication steps that are time resource intensive. Herein, simple approach proposed in which commercially available, low‐cost SiO 2 nanoparticles (NPs)...
Abstract Hybrid vapor deposition is one of the most appealing processes for perovskite photovoltaics fabrication, thanks to its versatile nature. By using sequentially different tailored inorganic and organic precursors' peculiarities, this type process gives access full potential deposition. While metal halides well understood mastered, organohalide species much more delicate (degradation vapors, high pressure, setup‐specific constraints). Here, a novel close space sublimation system...
Abstract Cesium‐formamidinium lead iodide (Cs x FA 1‐x PbI 3 ) perovskites are a promising methylammonium‐free alternative for efficient single‐junction solar cells. However, they have not been fully explored by vapor‐phase deposition techniques. Herein, template‐assisted approach is demonstrated the growth of Cs perovskite films using pulsed laser (PLD) from single‐source target mixed precursors. Implementing (PbI 2 + tailored template, phase‐pure with uniform coverage on both planar and...
Microscale pyramids of silicon solar cells are often considered incompatible with solution-processed perovskite films. Thus, solution processing has mainly been used submicron that buried under thick films flattened front surfaces. Yet, while this modification simplifies the fabrication process, it compromises optical performance compared to conformal (e.g., obtained by vapor processing). Here, we show protrusion-free can be formed on random much higher than film thickness tailoring match...
<title>Abstract</title> Inverted perovskite solar cells face performance limitations due to non-radiative recombination at the surfaces in devices, including functional layers. Advanced characterization and density theory reveal that phosphonic acids passivate surface defects, while piperazinium chloride mitigates interface by improving energy level alignment, introducing a field effect, homogenizing surface. Together, quasi-Fermi splitting of is homogeneously increased ca. 100mV. This...
High control chemical vapour deposition of (Cs,FA)PbI<sub>3</sub> perovskite provides insights into CVD kinetics and phase evolution.
Perovskite‐Cu(In,Ga)Se 2 (CIGS) thin‐film tandem technology provides an exciting prospect to achieve low‐cost high‐efficiency photovoltaic devices by high throughput roll‐to‐roll processing on flexible substrates. However, no report perovskite‐CIGS mini‐modules has been published due scribing‐related challenges in realizing near‐infrared (NIR)‐transparent perovskite Herein, NIR‐transparent mini‐module with efficiency of 10.8% and NIR‐transparency over 75% is reported. All‐laser scribed...
In perovskite/silicon tandem solar cells, the utilization of silicon heterojunction (SHJ) cells as bottom is one most promising concepts. Here, we present optimization strategies for top cell processing and their integration into SHJ based on industrial Czochralski (Cz)-Si wafers 140 μm thickness. We show that combining self-assembled monolayer [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz) with an additional phosphonic (PA) different functional groups, can improve film...
Combining the two technologies of tandem solar cells and bifacial has a great potential to maximize energy harvesting while minimizing material surface usage. Mid-bandgap perovskites (1.50-1.60 eV) are important for fulfilling current matching in perovskite/silicon heterojunction cells. Herein, efficient (>20%) stable planar FAPbI3-based perovskite (1.54 have been fabricated via hybrid evaporation-spin coating process. X-ray diffraction electron microscopy data reveal formation highly...
Abstract Perovskite-Si tandem solar cells are the most prominent contenders to succeed commercial single-junction Si that dominate market today. Yet, justify added cost of inserting a perovskite cell on top Si, devices should first exhibit sufficiently high power conversion efficiencies (PCEs). Here, we present two key developments with synergetic effect boost PCEs our front-side flat wafers - use 2,3,4,5,6-pentafluorobenzylphosphonic acid (pFBPA) in precursor ink suppresses non-radiative...
Abstract The primary performance limitation in inverted perovskite-based solar cells is the interface between fullerene-based electron transport layers and perovskite. We developed atomic layer deposited thin AlOX interlayers that reduce nonradiative recombination at perovskite/C60 interface, resulting > 60 millivolts improvement open-circuit voltage 1% absolute power conversion efficiency. Surface-sensitive characterizations indicate presence of a thin, conformally AlOx layer,...
Materials & processes to scale-up 2-terminal perovskite/Si tandem solar cellsQuentin Jeangros a, Xin Yu Chin Florent Sahli Adriana Paracchino Daniel Jacobs Felipe Saenz Marion Dussouillez Ricardo Augusto Zanotto Razera Julian Walter Michele De Bastiani Lisa Champault Adrien Theytaz Jean-David Decoppet Deniz Türkay b, Kerem Artuk Christian Wolff Laurie-Lou Senaud Jonas Geissbühler Antoine Descoeudres Bertrand Paviet-Salomon Christophe Ballif ba Centre d'Electronique et de Microtechnique...
In this work, we demonstrate the use of an in-house built automated airbrush system to spray coat PEDOT:PSS layers on p-type silicon surfaces. We identify effects chemical additives spraying reliability and show that addition a fluorosurfactant can provide clog-free operation is suitable for laboratory use. Next, analyze influence hot plate temperature nozzle height saturation current density (J <inf xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Tin fluoride (SnF2) is an indispensable additive for high-efficiency Pb-Sn perovskite solar cells (PSCs). However, the spatial distribution of SnF2 in absorber seldom investigated while essential a comprehensive understanding exact role additive. Herein, we revealed and made structure-optoelectronic properties-flexible photovoltaic performance correlation. We observed chemical transformation to fluorinated oxy-phase on film surface, due its rapid oxidation. In addition, at buried interface,...
Beyond the limitations of single-junction solar cells, multi-junction devices offer possibility to harness sun' light more efficiently. In particular perovskite-on-silicon (Pk/Si) tandems hold great promise high efficiencies >30 % while maintaining low cost. We report on our latest progress in development Pk/Si comparing efforts single-side and double-side textured tandems, reaching a VOC up 1.95 V, summed short-circuit current densities above 41 mA/cm2, certified >29 %, an active area 1cm2....