A5081870719- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Solid-state spectroscopy and crystallography
- solar cell performance optimization
- Analog and Mixed-Signal Circuit Design
- Silicon and Solar Cell Technologies
- CCD and CMOS Imaging Sensors
- Quantum, superfluid, helium dynamics
- Thin-Film Transistor Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Advancements in PLL and VCO Technologies
- Semiconductor materials and devices
- Radiation Detection and Scintillator Technologies
- Thermal Expansion and Ionic Conductivity
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Chemical Physics Studies
- Machine Learning in Materials Science
- Network Time Synchronization Technologies
- TiO2 Photocatalysis and Solar Cells
- Radiation Effects in Electronics
- Transition Metal Oxide Nanomaterials
- Physics of Superconductivity and Magnetism
University of Potsdam
2020-2025
Czech Academy of Sciences, Institute of Physics
2022-2025
Institute of Astronomy
2025
State University of New York at Potsdam
2024
Leibniz Institute for Astrophysics Potsdam
2023
University of Cambridge
2019-2023
Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
2023
University of Kaiserslautern
2023
Helmholtz-Zentrum Berlin für Materialien und Energie
2014-2022
National Institute for Materials Science
2019
We present a monolithic perovskite/silicon tandem cell enabling high Voc and stabilized power output of 18%.
Improved stability and efficiency of two-terminal monolithic perovskite-silicon tandem solar cells will require reductions in recombination losses. By combining a triple-halide perovskite (1.68 electron volt bandgap) with piperazinium iodide interfacial modification, we improved the band alignment, reduced nonradiative losses, enhanced charge extraction at electron-selective contact. Solar showed open-circuit voltages up to 1.28 volts p-i-n single junctions 2.00 cells. The achieve certified...
The radiation hardness of CH3NH3PbI3-based solar cells is evaluated from in situ measurements during high-energy proton irradiation. These organic–inorganic perovskites exhibit and withstand doses that exceed the damage threshold crystalline silicon by almost 3 orders magnitude. Moreover, after termination irradiation, a self-healing process commences.
Perovskite-silicon tandem solar cells offer the possibility of overcoming power conversion efficiency limit conventional silicon cells. Various textured devices have been presented aiming at improved optical performance, but optimizing film growth on surface-textured wafers remains challenging. Here we present perovskite-silicon with periodic nanotextures that various advantages without compromising material quality solution-processed perovskite layers. We show a reduction in reflection...
Perovskite-based tandem solar cells can increase the power conversion efficiency (PCE) of conventional single-junction photovoltaic devices. Here, we present monolithic perovskite/CIGSe with a perovskite top cell fabricated directly on an as-grown, rough CIGSe bottom cell. To prevent potential shunting due to surface, thin NiOx layer is conformally deposited via atomic deposition front contact The performance further improved by additional polymer PTAA at NiOx/perovskite interface. This hole...
Abstract Perovskite semiconductors are an attractive option to overcome the limitations of established silicon based photovoltaic (PV) technologies due their exceptional opto‐electronic properties and successful integration into multijunction cells. However, performance single‐ cells is largely limited by significant nonradiative recombination at perovskite/organic electron transport layer junctions. In this work, cause interfacial perovskite/C 60 interface revealed via a combination...
Perovskite solar cells with transparent contacts may be used to compensate for thermalization losses of silicon in tandem devices. This offers a way outreach stagnating efficiencies. However, perovskite top structures require contact layers high electrical conductivity and optimal transparency. We address this challenge by implementing large-area graphene grown chemical vapor deposition as highly electrode cells, leading identical charge collection Electrical performance graphene-based...
Abstract Inverted perovskite solar cells still suffer from significant non-radiative recombination losses at the surface and across perovskite/C 60 interface, limiting future development of perovskite-based single- multi-junction photovoltaics. Therefore, more effective inter- or transport layers are urgently required. To tackle these losses, we introduce ortho-carborane as an interlayer material that has a spherical molecular structure three-dimensional aromaticity. Based on variety...
Abstract The presence of mobile ions in metal halide perovskites has been shown to adversely affect the intrinsic stability perovskite solar cells (PSCs). However, actual contribution total degradation loss compared with other factors such as trap-assisted recombination remains poorly understood. Here we reveal that ion-induced internal field screening is dominant factor PSCs under operational conditions. increased leads a decrease steady-state efficiency, often owing large reduction current...
Abstract Organic–inorganic perovskite solar cells have experienced a remarkable development. In short period of time power conversion efficiencies jumped to values more than 22%. However, the stability these devices is an important subject. The CH 3 NH PbI films investigated using visible and ultraviolet light in oxygen atmosphere vacuum. Illumination O 2 results swift degradation. Oxygen acts as catalyst decomposing methylammonium ions (CH + ) into hydrogen. vacuum, another degradation...
Abstract In the present study, random current fluctuations measured at different temperatures and for illumination levels are used to understand charge carrier kinetics in methylammonium lead iodide CH 3 NH PbI ‐based perovskite solar cells. A model, combining trapping/detrapping, recombination mechanisms, electron–phonon scattering, is formulated evidencing how presence of shallow deeper band tail states influences cell losses. At low temperatures, observed cascade capture process indicates...
Monolithic [Cs0.05(MA0.17FA0.83)0.95]Pb(I0.83Br0.17)3/Cu(In,Ga)Se2 (perovskite/CIGS) tandem solar cells promise high performance and can be processed on flexible substrates, enabling cost-efficient ultra-lightweight space photovoltaics with power-to-weight power-to-cost ratios surpassing those of state-of-the-art III-V semiconductor-based multijunctions. However, to become a viable technology, the full stack must withstand harsh radiation environments in space. Here, we design tailored...
Perovskite solar cells have been shown to be of extraordinary radiation hardness, considering high energetic (68 MeV) proton irradiation with doses up 10 13 p cm −2 . In this study electrical and photoelectrical properties perovskite without are analyzed in detail. The results reveal that improves the open circuit voltage, fill factor, recombination lifetime photogenerated charge carriers cells. These enhancements mainly a result lower nonradiative losses irradiated devices. treatment...
Solar cells made from inorganic–organic perovskites have gradually approached market requirements as their efficiency and stability improved tremendously in recent years. Planar low-temperature processed perovskite solar are advantageous for possible large-scale production but more prone to exhibiting photocurrent hysteresis, especially the regular n–i–p structure. Here, a systematic characterization of different electron selective contacts with variety chemical electrical properties planar...
Inorganic–organic perovskites like methylammonium-lead-iodide have proven to be an effective class of materials for fabricating efficient solar cells. To improve their performance, light management techniques using textured surfaces, similar those used in established cell technologies, should considered. Here, we apply a foil created by UV nanoimprint lithography on the glass side inverted (p-i-n) perovskite with 16.3% efficiency. The obtained 1 mA cm–2 increase short-circuit current density...
Although highly energetic proton irradiation forms localized trap states in triple cation perovskites, solar cells possess exceptional radiation hardness.
Abstract Efficient mixed metal lead‐tin halide perovskites are essential for the development of all‐perovskite tandem solar cells, however they currently limited by significant short‐circuit current losses despite their near optimal bandgap (≈1.25 eV). Herein, origin these is investigated, using a combination voltage dependent photoluminescence (PL) timeseries and various charge extraction measurements. It demonstrated that Pb/Sn‐perovskite devices suffer from reduction in efficiency within...
Monolithic perovskite/silicon tandem solar cells recently surpass the efficiency of silicon single‐junction cells. Most utilize >250 μm thick, planarized float‐zone (FZ) silicon, which is not compatible with commercial production using <200 thick Czochralski (CZ) silicon. The based on industrially relevant 100 CZ‐silicon without mechanical planarization are demonstrated. best power conversion (PCE) 27.9% only marginally below 28.2% reference value obtained commonly used front‐side...
Perovskite semiconductors differ from most inorganic and organic due to the presence of mobile ions in material. Although phenomenon is intensively investigated, important questions such as exact impact on steady‐state power conversion efficiency (PCE) stability remain. Herein, a simple method proposed estimate loss via “fast‐hysteresis” measurements by preventing perturbation out their equilibrium position at fast scan speeds (1000 V s −1 ). The “ion‐free” PCE between 1% 3% higher than PCE,...
Abstract Understanding performance losses in all‐perovskite tandem photovoltaics is crucial to accelerate advancements toward commercialization, especially since these devices generally underperform comparison what expected from isolated layers and single junction devices. Here, the individual sub‐cells stacks are selectively characterized disentangle various losses. It found that non‐radiative high‐gap subcell dominate overall recombination baseline system, as well majority of literature...