A5015214782- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Coral and Marine Ecosystems Studies
- Solid-state spectroscopy and crystallography
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Electrocatalysts for Energy Conversion
- Organic and Molecular Conductors Research
Princeton University
2015-2020
University of California, Berkeley
2015
One merit of organic–inorganic hybrid perovskites is their tunable bandgap by adjusting the halide stoichiometry, an aspect critical to application in tandem solar cells, wavelength-tunable light emitting diodes (LEDs), and lasers. However, phase separation mixed-halide caused or applied bias results undesirable recombination at iodide-rich domains, meaning open-circuit voltage (VOC) pinning cells infrared emission LEDs. Here, we report approach suppress redistribution self-assembled...
Hybrid organic-inorganic halide perovskite semiconductors are attractive candidates for optoelectronic applications, such as photovoltaics, light-emitting diodes, and lasers. Perovskite nanocrystals of particular interest, where electrons holes can be confined spatially, promoting radiative recombination. However, nanocrystalline films based on traditional colloidal nanocrystal synthesis strategies suffer from the use long insulating ligands, low concentration, significant aggregation during...
Abstract Perovskite light‐emitting diodes (LEDs) require small grain sizes to spatially confine charge carriers for efficient radiative recombination. As size decreases, passivation of surface defects becomes increasingly important. Additionally, polycrystalline perovskite films are highly brittle and mechanically fragile, limiting their practical applications in flexible electronics. In this work, the introduction properly chosen bulky organo‐ammonium halide additives is shown be able...
Abstract Hybrid organic–inorganic metal halide perovskites are particularly promising for light‐emitting diodes (LEDs) due to their attractive optoelectronic properties such as wavelength tunability, narrow emission linewidth, defect tolerance, and high charge carrier mobility. However, the undercoordinated Pb at perovskite nanocrystal (NC) surface causes traps nonradiative recombination. In this work, external quantum efficiency of iodide‐based LEDs is boosted greater than 15%, with an 750...
Extensive transient absorption studies on hybrid organic–inorganic lead halide perovskites have elucidated many optical properties important for their device performance. Despite the enormous progress, derivative shaped photoinduced feature in spectra that is above bandgap has explanations, including Stark effect, where blue shifted due to a local electric field generated by charges. In this work, we employ broad band and two-dimensional electronic spectroscopy (2DES) examine early events...
Facile and reversible deposition of metal layers would enhance power energy densities hybrid batteries. Here, we investigate Cu2+/Cu(0) on a RuO2 anode soluble Fe2+/Fe3+ oxidation symmetric cathode in aqueous electrolyte. The process Cu plating, the same cell configuration, leads to significant discharge capacities electrodes, while traditional pure transition electrodes have negligible carbon fraction it. areal delivery during is nearly constant (70 μW/cm2), whether charged for seconds or...