A5057785360- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- Organic Electronics and Photovoltaics
- Crystal Structures and Properties
- Magnetic and transport properties of perovskites and related materials
- Catalysis and Oxidation Reactions
- Electronic and Structural Properties of Oxides
- Thin-Film Transistor Technologies
- Optical Coatings and Gratings
- Catalytic Processes in Materials Science
- Optical properties and cooling technologies in crystalline materials
- Luminescence Properties of Advanced Materials
- Advanced Surface Polishing Techniques
- ZnO doping and properties
Helmholtz-Zentrum Berlin für Materialien und Energie
2016-2023
Lund University
2016
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...
Abstract Large datasets are now ubiquitous as technology enables higher-throughput experiments, but rarely can a research field truly benefit from the data generated due to inconsistent formatting, undocumented storage or improper dissemination. Here we extract all meaningful device peer-reviewed papers on metal-halide perovskite solar cells published so far and make them available in database. We collect over 42,400 photovoltaic devices with up 100 parameters per device. then develop...
Abstract Solar cells incorporating metal‐halide perovskite (MHP) semiconductors are continuing to break efficiency records for solution‐processed solar cell devices. Scaling MHP‐based devices larger area prototypes requires the development and optimization of scalable process technology ink formulations that enable reproducible coating results. It is demonstrated power conversion (PCE) small‐area methylammonium lead iodide (MAPbI 3 ) devices, slot‐die coated from a 2‐methoxy‐ethanol (2‐ME)...
Metal halide perovskites are the first solution processed semiconductors that can compete in their functionality with conventional semiconductors, such as silicon. Over past several years, perovskite have reported breakthroughs various optoelectronic devices, solar cells, photodetectors, light emitting and memory so on. Until now, face challenges regarding stability, reproducibility, toxicity. In this Roadmap, we combine expertise of chemistry, physics, device engineering from leading...
Metal halide perovskite based tandem solar cells are promising to achieve power conversion efficiency beyond the theoretical limit of their single-junction counterparts. However, overcoming significant open-circuit voltage deficit present in wide-bandgap remains a major hurdle for realizing efficient and stable cells. Here, holistic approach challenges 1.8 eV is reported by engineering crystallization pathway means chloride additives. In conjunction with employing self-assembled monolayer as...
Abstract The next technological step in the exploration of metal‐halide perovskite solar cells is demonstration larger‐area device prototypes under outdoor operating conditions. authors here demonstrate that when slot‐die coating halide layers on large areas, ribbing effects may occur but can be prevented by adjusting precursor ink's rheological properties. For formamidinium lead triiodide (FAPbI 3 ) inks based 2‐methoxyethanol, ink viscosity adjusted adding acetonitrile (ACN) as a...
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...
Wide bandgap halide perovskite materials show promising potential to pair with silicon bottom cells. To date, most efficient wide perovskites layers are fabricated by spin-coating, which is difficult scale up. Here, we report on slot-die coating for an efficient, 1.68 eV triple-halide (3halide) absorber, (Cs0.22FA0.78)Pb(I0.85Br0.15)3 + 5 mol % MAPbCl3. A suitable solvent system designed specifically the technique. We demonstrate that our fabrication route tandem solar cells without phase...
Morphological modification by DIO additive facilitates charge generation in the bulk of Y6, suppresses bimolecular recombination, which results an increased J SC and FF single component Y6 solar cells.
In this article, we rationalize chemical pathways and kinetics of hybrid perovskites crystallization from binary solvent mixtures based on binding strength, evaporation rate model, <italic>in situ</italic> GIWAXS monitoring.
Abstract In this work, we present a detailed investigation of the optical properties hybrid perovskite building blocks, [PbI 2+n ] n− , that form in solutions CH 3 NH PbI and 2 . The absorbance, photoluminescence (PL) excitation (PLE) spectra were measured various solvents broad concentration range. Both exhibit absorption features attributed to 1− 4 2− complexes. Therefore, propose new mechanism for formation polymeric polyiodide plumbates pristine For first time, show species both peak at...
Photoinduced phase separation, which limits the available band gap energies for photovoltaic applications, was reported a range of mixed-halide perovskites. A microscopic understanding separation mechanism is still lacking but may be beneficial to rationalize limitations as well enable design phase-stable perovskite semiconductors. In this letter, electron-beam-induced separations and transformations were investigated in small crystallite CsPb(Br0.8I0.2)3 by means situ high-resolution...
ABX3 metal halide perovskites revolutionized the research and development of new optoelectronics, including solar cells light-emitting diodes. Processing polycrystalline thin films from precursor solutions is one core advantages these materials since it enables versatile cost-effective manufacturing. The perovskite film morphology, that is, continuous substrate coverage low surface roughness, paramount importance for highly efficient optoelectronic devices in general. Controlling chemistry...
The diffusion or transport lengths of photo-generated charge carriers in CH3NH3PbI3 layers (thickness up to 1 μm) and powders have been directly measured with high accuracy by modulated surface photovoltage after Goodman. values the ranged from 200 nm tenths μm. In thin layers, corresponded layer thickness whereas thicker crystallites grain size limited length. For grains, length depended on measurement conditions.
Abstract Solar cells incorporating metal-halide perovskite (MHP) semiconductors are continuing to break efficiency records for solution-processed solar cell devices. Scaling MHP-based devices larger area prototypes is a crucial step towards commercialization. This requires the development and optimization of scalable process technology these Here, we demonstrate maximum power conversion (PCE) 20.83% slot-die coated gas-quenched small-area methylammonium lead iodide (MAPbI3) Our ink based on...
A new method for droplet placement in combinatorial inkjet printing, validated by synchrotron micro-spot X-ray diffraction mapping of CsPb(Br x I 1− ) 3 .
Hybrid perovskites have already shown a huge success as an absorber in solar cells, resulting the skyrocketing rise power conversion efficiency to more than η = 22%. Recently, it has been established that crystal quality is one of most important parameters obtain devices with high efficiencies. However, influence on material properties not fully understood. Here, morphology electronic CH3NH3PbI3 thin films investigated. Postannealing was used vary average grain size continuously from ≈150...
Abstract Recently, liquid phase crystallization of thin silicon films has emerged as a candidate for thin-film photovoltaics. On 10 μm absorbers, wafer-equivalent morphologies and open-circuit voltages were reached, leading to 13.2% record efficiency. However, short-circuit current densities are still limited, mainly due optical losses at the glass-silicon interface. While nano-structures this interface have been shown efficiently reduce reflection, up now these textures caused deterioration...
The heating and cooling phase diagram of CsPb(Br x I 1− ) 3 is determined by combinatorial synthesis high throughput X-ray characterization.
Solvent-solute interactions in precursor solutions of lead halide perovskites (LHP) critically impact the quality solution-processed materials, as they to formation a variety poly-iodoplumbates that act building blocks for LHP. The [PbI$_{2+n}$]$^{n-}$ complexes is often expected diluted while coordination occurring at high concentrations not well understood yet. In combined \textit{ab initio} and experimental work, we demonstrate optical spectra quasi-one-dimensional iodoplumbate...
In a period of only few years, the power conversion efficiency organic–inorganic perovskite solar cells has surpassed value 24.2%. However, major drawback is lack long‐term stability, which partially related to dissociation organic cations under prolonged illumination. This degradation mechanism not limited ambient temperatures. At low temperatures ( T = 5 K), illumination methyl ammonium lead iodide (CH 3 NH PbI ) thin films with photon energy E ph 3.4 eV results in formation localized trap...
Hybrid perovskites are a novel type of semiconductors that show great potential for solution-processed optoelectronic devices. For all applications, the device performance is determined by quality perovskite thin films. During solution processing, interaction solvent with precursor molecules often leads to formation solvate intermediate phases may diverge crystallization pathway from simple evaporation multi-step process. We here investigate methylammonium lead iodide (MAPbI 3 ) range...
Tandem solar cells consisting of perovskite and silicon absorbers have the potential to outperform respective state‐of‐the‐art single junction efficiencies. However, their development requires gentle deposition a transparent electrode onto hybrid its organic layers. Implementation large area graphene obtained by chemical vapor seems be an excellent solution. In this paper, we present impact on Direct application CH 3 NH PbI is limited highly defective interface but insertion spiro‐OMeTAD...
Methylammonium lead iodide (CH3NH3PbI3), an organic-inorganic perovskite widely used for optoelectronic applications, is known to dissociate under illumination with light at photon energies around 2.7 eV and higher. Here, we show that photo-induced dissociation not limited ambient temperatures but can be observed even 5 K. The of N–H bonds results in the formation metastable states. Photoluminescence (PL) measurements reveal defect states are located 100 meV within bandgap. This accompanied...