A5016433975- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- solar cell performance optimization
- Conducting polymers and applications
- Thin-Film Transistor Technologies
- Organic Electronics and Photovoltaics
- Semiconductor Lasers and Optical Devices
- Semiconductor Quantum Structures and Devices
- Gyrotron and Vacuum Electronics Research
- Silicon and Solar Cell Technologies
- Surface Roughness and Optical Measurements
- Organic Light-Emitting Diodes Research
- Photonic and Optical Devices
- Quantum, superfluid, helium dynamics
- Energy Harvesting in Wireless Networks
- Nanowire Synthesis and Applications
- Photovoltaic System Optimization Techniques
- Microwave Engineering and Waveguides
- Laser Material Processing Techniques
- Solid-state spectroscopy and crystallography
- Integrated Circuits and Semiconductor Failure Analysis
- Spacecraft and Cryogenic Technologies
- Pigment Synthesis and Properties
- Optical measurement and interference techniques
University of Ljubljana
2014-2025
Helmholtz-Zentrum Berlin für Materialien und Energie
2018-2022
Technical University of Darmstadt
2017
Technische Universität Berlin
2016-2017
Munich University of Applied Sciences
2015
IBM Research - Thomas J. Watson Research Center
2003
IBM Research - Zurich
1990
IBM (United States)
1989
Tandem solar cells that pair silicon with a metal halide perovskite are promising option for surpassing the single-cell efficiency limit. We report monolithic perovskite/silicon tandem certified power conversion of 29.15%. The absorber, bandgap 1.68 electron volts, remained phase-stable under illumination through combination fast hole extraction and minimized nonradiative recombination at hole-selective interface. These features were made possible by self-assembled, methyl-substituted...
We introduce new hole-selective contacts for next-generation perovskite photovoltaics and point to design paths molecular engineering of perfect interfaces.
25.5% efficiency is demonstrated for monolithic perovskite/silicon tandem solar cell using textured foil and the impact of texture position on performance energy yield simulated.
Abstract The unprecedented emergence of perovskite‐based solar cells (PSCs) has been accompanied by an intensive search suitable materials for charge‐selective contacts. For the first time a hole‐transporting self‐assembled monolayer (SAM) as dopant‐free hole‐selective contact in p–i–n PSCs is used and power conversion efficiency up to 17.8% with average fill factor close 80% undetectable parasitic absorption demonstrated. SAM formation achieved simply immersing substrate into solution novel...
We present a highly efficient monolithic perovskite/silicon tandem solar cell and analyze the performance as function of photocurrent mismatch with important implications for future device energy yield optimizations.
We demonstrate a monolithic perovskite/CIGS tandem solar cell with certified power conversion efficiency (PCE) of 24.2%. The still exhibits photocurrent mismatch between the subcells; thus optical simulations are used to determine optimal device stack. Results reveal high potential optimized reaching short-circuit current density 19.9 mA cm–2 and 32% PCE based on semiempirical material properties. To evaluate its energy yield, we first CIGS temperature coefficient, which is at −0.38% K–1...
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...
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...
Abstract Perovskite solar cells (PSC) have shown that under laboratory conditions they can compete with established photovoltaic technologies. However, controlled measurements usually performed do not fully resemble operational and field testing outdoors, day‐night cycles, changing irradiance temperature. In this contribution, the performance of PSCs in rooftop test, exposed to real weather is evaluated. The 1 cm 2 single‐junction devices, an initial average power conversion efficiency 18.5%...
Abstract The structural phases and optoelectronic properties of coevaporated CsPbI 3 thin films with a wide range [CsI]/[PbI 2 ] compositional ratios are investigated using high throughput experimentation gradient samples. It is found that for CsI‐rich growth conditions, can be synthesized directly at low temperature into the distorted perovskite γ‐CsPbI phase without detectable secondary phases. In contrast, PbI ‐rich conditions to lead non‐perovskite δ‐phase. Photoluminescence spectroscopy...
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.
For methylammonium lead iodide perovskite solar cells prepared by co-evaporation, power conversion efficiencies of over 20% have been already demonstrated, however, so far, only in n-i-p configuration. Currently, the overall major challenges are complex evaporation characteristics organic precursors that strongly depend on underlying charge selective contacts and insufficient reproducibility co-evaporation process. To ensure a reliable process, it is important to identify impact different...
Careful interface design and engineering are “keys” to effectively implement a conformal 10 nm plasma-assisted atomic-layer-deposited NiO film as hole transport layer in p–i–n perovskite solar cell architecture.
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...
Indoor photovoltaics (IPV) hold enormous market potential driven by the rising demand for perpetual energy sources to power various small electrical devices and especially Internet of things (IoT) devices. Perovskite solar cells (PSCs) offer exciting prospects this role. This study sets out deepen our knowledge PSC performance under realistic indoor conditions. For purpose, we designed an monitoring system that maintains four at their maximum points simultaneously logs environmental...
Abstract Perovskite‐based solar cells exhibit peculiar outdoor performance which is not yet fully understood. The results of tests may contain hidden, but valuable information that cannot be extracted from measurements alone. One such phenomenon the effect nighttime degradation and subsequent light‐soaking recovery, can take a few hours in morning up to entire day. In this work, long‐term monitoring combined with energy yield modeling qualitatively quantitatively investigate recovery both...
Improving the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs) remain two most important goals research. Herein, effects Al 2 O 3 interlayer on performance formamidinium‐cesiums “triple cation” PSCs by depositing a thin layer via atomic deposition different interfaces are analyzed. It is found that it can efficiently serve as passivation absorber, seed for compact growth subsequent SnO layer, or capping to whole cell in superstrate configuration prevent...
We report on the formation of wrinkle-patterned surface morphologies in cesium formamidinium-based CsxFA1–xPb(I1–yBry)3 perovskite compositions with x = 0–0.3 and y under various spin-coating conditions. By varying Cs Br contents, precursor solution concentration procedure, occurrence characteristics wrinkle-shaped morphology can be tailored systematically. Cs0.17FA0.83Pb(I0.83Br0.17)3 layers were analyzed regarding their roughness, microscopic structure, local overall composition,...
We performed optical simulations using hydrogenated nanocrystalline silicon oxide (nc-SiOx:H) as n-doped interlayer in monolithic perovskite/c-Si heterojunction tandem solar cells. Depending on the adjustable value of its refractive index (2.0 - 2.7) and thickness, nc-SiOx:H allows to optically manage infrared light absorption c-Si bottom cell minimizing reflection losses. give guidelines for optimization devices combination with a systematic investigation effect surface morphology (flat or...
Abstract The effect of sodium doping in NiO as a contact layer for perovskite solar cells is investigated. A combined X‐ray diffraction and photoelectron spectroscopy analysis reveals that Na + mostly segregates NaO x /NaCl species around crystallites, with the reducing interface capacitance revealed by impedance spectroscopy. Inspired this finding, NiO/perovskite modified via insertion an ultrathin NaCl interlayer, which increases work‐function 0.3 eV. This leads to increase power...
Abstract A comprehensive algorithm for calculating the energy yield ( EY ) is used as most important figure‐of‐merit in determining capabilities of PV devices realistic operation. The model based on advanced optical modeling and extensive opto‐thermo‐electrical characterization. It takes environmental device installation data fully into account, well complete set specifications including all relevant temperature‐induced variations. detailed analysis optimization two‐terminal...