A5018068092- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Magnetic and transport properties of perovskites and related materials
- Organic Electronics and Photovoltaics
- Catalysis and Oxidation Reactions
- Crystal Structures and Properties
- Advanced Chemical Sensor Technologies
- Gas Sensing Nanomaterials and Sensors
- Lanthanide and Transition Metal Complexes
- Advanced Photocatalysis Techniques
- Organic Light-Emitting Diodes Research
- Organic and Molecular Conductors Research
- Advanced Memory and Neural Computing
- Coral and Marine Ecosystems Studies
- Photorefractive and Nonlinear Optics
- Silicon and Solar Cell Technologies
- solar cell performance optimization
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced battery technologies research
- Polymer crystallization and properties
- Luminescence and Fluorescent Materials
University of Stuttgart
2021-2025
Helmholtz-Zentrum Berlin für Materialien und Energie
2019-2022
Zhengzhou University
2015-2021
Technical University of Darmstadt
2020
Sapienza University of Rome
2019
Yan'an University
2013-2014
Daily temperature variations induce phase transitions and lattice strains in halide perovskites, challenging their stability solar cells. We stabilized the perovskite black improved cell performance using ordered dipolar structure of β-poly(1,1-difluoroethylene) to control film crystallization energy alignment. demonstrated p-i-n cells with a record power conversion efficiency 24.6% over 18 square millimeters 23.1% 1 centimeter, which retained 96 88% after 1000 hours 1-sun maximum point...
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 Tin halide perovskites attract incremental attention to deliver lead‐free perovskite solar cells. Nevertheless, disordered crystal growth and low defect formation energy, related Sn(II) oxidation Sn(IV), limit the efficiency stability of Engineering processing from precursor solution preparation film crystallization is crucial tackle these issues enable full photovoltaic potential tin perovskites. Herein, ionic liquid n ‐butylammonium acetate (BAAc) used tune coordination with...
Abstract Over the past few years, lead‐halide perovskites (LHPs), both in form of bulk thin films and colloidal nanocrystals (NCs), have revolutionized field optoelectronics, emerging at forefront next‐generation optoelectronics. The power conversion efficiency (PCE) halide perovskite solar cells has increased from 3.8% to over 25.7% a short period time is very close theoretical limit (33.7%). At same time, external quantum (EQE) LEDs surpassed 23% 20% for green red emitters, respectively....
Low toxicity and an ideal energy bandgap make two-dimensional (2D) Ruddlesden–Popper tin-based halide perovskites a promising photovoltaic material. However, the disordered crystal orientation oxidation of Sn2+ to Sn4+ still need be addressed. Here, we demonstrate that annealing FASnI3 assisted by phenyl ethylammonium chloride enables formation more ordered 2D perovskite crystals oriented vertically. We use in situ synchrotron-based grazing incident X-ray diffraction correlate higher better...
Abstract The rapid development of Internet Things mobile terminals has accelerated the market's demand for portable power supplies and flexible wearable devices. Here, an embedded metal‐mesh transparent conductive electrode (TCE) is prepared on poly(ethylene terephthalate) (PET) using a novel selective electrodeposition process combined with inverted film‐processing methods. This nickel (Ni)‐mesh TCE shows excellent photoelectric performance (sheet resistance ≈0.2–0.5 Ω sq −1 at high...
Abstract In perovskite solar cells (PSCs), the interfaces are a weak link with respect to degradation. Electrochemical reactivity of perovskite's halides has been reported for both molecular and polymeric hole selective layers (HSLs), here it is shown that also NiO brings about this decomposition mechanism. Employing as an HSL in p–i–n PSCs power conversion efficiency (PCE) 16.8%, noncapacitive hysteresis found dark, which attributable bias‐induced degradation perovskite/NiO interface. The...
The ON/OFF ratio and long-term stability are two important issues for flexible organic-inorganic hybrid perovskite (OHP) resistive random access memory (RRAM) practical applications. In this work, polyvinylammonium (PVAm) is applied to partially replace methylamine ions (MA+) fabricate the stable polymeric OHP RRAM devices, wherein PVAm acts as nucleation sites template crystalline growth of MAPbI3 tune microscopic structure. Simultaneously, multiple grain interfaces strengthened through...
Flexible perovskite solar cells (FPSCs) represent a promising technology in the development of next-generation photovoltaic and optoelectronic devices. SnO2 electron transport layers (ETL) typically undergo significant cracking during bending process FPSCs, which can significantly compromise their charge properties. Herein, semi-planar non-fullerene acceptor molecule Y6 (BT-core-based fused-unit dithienothiophen [3,2-b]-pyrrolobenzothiadiazole derivative) is introduced as buffer layer for...
Abstract Metal halide perovskite solar cells (PSCs) have emerged as an important direction for photovoltaic research. Although the power conversion efficiency (PCE) of lead‐based PSCs has reached 25.7%, still toxicity Pb remains one main obstacle commercial adoption. Thus, to address this issue, Pb‐free perovskites been proposed. Among them, tin‐based promising candidates. Unfortunately, fast oxidation Sn 2+ 4+ leads low stability and efficiency. Many strategies implemented these challenges...
The most efficient and stable perovskite solar cells (PSCs) are made from a complex mixture of precursors. Typically, to then form thin film, an extreme oversaturation the precursor is initiated trigger nucleation sites, e.g., by vacuum, airstream, or so-called antisolvent. Unfortunately, triggers do not expel lingering (and highly coordinating) dimethyl sulfoxide (DMSO), which used as solvent, films; this detrimentally affects long-term stability. In work, (the green) sulfide (DMS)...
Perovskite solar cells (PSCs) excel in achieving high open-circuit voltages (VOC) for narrow bandgaps (∼1.6 eV) but face challenges with wide-bandgap perovskites, like methylammonium lead trichloride (MAPbCl3) a 3.03 eV bandgap. These materials are transparent visible absorbing ultraviolet (UV) light. However, uniform film crystallization remains hurdle. Here, we enhance MAPbCl3 by manipulating annealing atmospheres (nitrogen, air, and MACl vapor). Excess vapor improves surface coverage,...
Abstract The inherent defects (lead iodide inversion and iodine vacancy) in perovskites cause non‐radiative recombination there is also ion migration, decreasing the efficiency stability of perovskite devices. Eliminating these critical for achieving high‐efficiency solar cells. Herein, an organic molecule with multiple active sites (4,7‐bromo‐5,6‐fluoro‐2,1,3‐phenylpropyl thiadiazole, M4) introduced to modify upper interface perovskites. When M4 interacts surface, bromine (Br) site lead...
All-inorganic perovskites, such as CsPbI2Br, have emerged promising compositions due to their enhanced thermal stability. However, they face significant challenges susceptibility humidity. In this work,...
Two-dimensional materials stabilize perovskites for charge transfer under heat and light irradiation.
Abstract Mixed cation/halide perovskites have led to a significant increase in the efficiency and stability of perovskite solar cells. However, mobile ionic defects inevitably exacerbate photoinduced phase segregation self‐decomposition crystal structure. Herein, ultrathin 2D nanosheets oxo‐functionalized graphene/dodecylamine (oxo‐G/DA) are used solve ion migration cesium (Cs)‐formamidinium (FA)‐methylammonium (MA) triple‐cation‐based perovskites. Based on superconducting carbon skeleton...
All-inorganic perovskites have emerged as promising photovoltaic materials due to their superior thermal stability compared heat-sensitive hybrid organic-inorganic counterparts. In particular, CsPbI2 Br shows the highest potential for developing thermally-stable perovskite solar cells (PSCs) among all-inorganic compositions. However, controlling crystallinity and morphology of compositions is a significant challenge. Here, simple, gradient- antisolvent-free method reported control...
Quasi-two-dimensional halide perovskites are commonly used in solar cells, as they more stable than their three-dimensional analogues. Nevertheless, it is still challenging to meet the stability requirements under high-humidity conditions. Here, we design π-conjugated carbazole (CA) cations increase water resistance of perovskite. We control crystallization kinetics by anti-solvent strategy locate hydrophobic low-⟨n⟩-value phase on surface perovskite film. The resulting CA2MA4Pb5I16 film...
Abstract Tin halide perovskites are an appealing alternative to lead perovskites. However, owing the lower redox potential of Sn(II)/Sn(IV), particularly under presence oxygen and water, accumulation Sn(IV) at surface layer will negatively impact device's performance stability. To this end, work has introduced a novel multifunctional molecule, 1,4‐phenyldimethylammonium dibromide diamine (phDMADBr), form protective on Sn‐based perovskite films. Strong interactions between phDMADBr improve...
Interfaces in perovskite solar cells play a crucial role their overall performance, and therefore, detailed fundamental studies are needed for better understanding. In the case of classical n-i-p architecture, TiO2 is one most used electron-selective layers can induce chemical reactions that influence performance device stack. The interfacial properties at TiO2/perovskite interface often neglected, owing to difficulty accessing this interface. Here, we use X-rays variable energies study...
Using high coordination dimethyl sulfide, the anti-solvent bathing technique enables efficient extraction of precursor solvents in perovskite wet film. The resulting highly crystalline films achieve a photovoltaic performance 20.6%.
Atomic layer deposition of aluminum oxide (ALD-Al 2 O 3 ) layers has been extensively studied for stabilizing perovskite solar cells (PSCs) against environmental stressors, such as humidity and oxygen. In addition, the ALD-Al ...
In a stable external environment, slow crystallization rate fosters lattice of pure “black”-phase perovskite, while post treatment at the grain boundaries enhance overall stability, contributing to long-term stability.