A5108063763- Perovskite Materials and Applications
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Crystallization and Solubility Studies
- Solid-state spectroscopy and crystallography
- X-ray Diffraction in Crystallography
- Quantum Dots Synthesis And Properties
- Spectroscopy and Quantum Chemical Studies
- Carbon Nanotubes in Composites
- Supramolecular Self-Assembly in Materials
- Semiconductor materials and interfaces
- 2D Materials and Applications
- Nanowire Synthesis and Applications
- Spectroscopy and Laser Applications
- Hydrogels: synthesis, properties, applications
- Advanced Memory and Neural Computing
- Molecular Junctions and Nanostructures
- Graphene research and applications
- Phase-change materials and chalcogenides
- Chalcogenide Semiconductor Thin Films
- Organic and Molecular Conductors Research
- Synthesis and Properties of Aromatic Compounds
- Luminescence and Fluorescent Materials
- Nanopore and Nanochannel Transport Studies
University of North Carolina at Chapel Hill
2016-2025
Zhengzhou University of Light Industry
2025
Chongqing Medical and Pharmaceutical College
2025
Chongqing University
2025
Southern Medical University
2024
Nanfang Hospital
2024
North Carolina State University
2021-2024
University of Science and Technology of China
2021
Shanghai Industrial Technology Institute
2021
Huazhong University of Science and Technology
2012-2020
Abstract It has been experimentally discovered that a low magnetic field (less than 500 mT) can substantially change the electroluminescence, photoluminescence, photocurrent, and electrical‐injection current in nonmagnetic organic semiconducting materials, leading to magnetic‐field effects (MFEs). Recently, there significant driving force understanding fundamental mechanisms of responses from materials because two potential impacts. First, MFEs be powerful experimental tools revealing...
Two-dimensional perovskites have emerged as more intrinsically stable materials for solar cells. Chemical tuning of spacer organic cations has attracted great interest due to their additional functionalities. However, how the chemical nature affects properties two-dimensional and devices is rarely reported. Here we demonstrate that selection (i.e., selective fluorination phenethylammonium) film perovskites, leading different device performance perovskite cells (average n = 4). Structural...
Developing novel materials and device architectures to further enhance the efficiency of polymer solar cells requires a fundamental understanding impact chemical structures on photovoltaic properties. Given that characteristics depend many parameters, deriving structure–property relationships has been very challenging. Here we report single parameter, hole mobility, determines fill factor several hundred nanometer thick bulk heterojunction devices based series copolymers with varying amount...
The molecular weight (MW) of PBnDT-FTAZ can be precisely controlled by adjusting the stoichiometric ratio two monomers, following Carothers equation. study a set polymers with different MWs reveals that MW significantly influences morphology and structural order PBnDTFTAZ in its bulk heterojunction solar cells, highest efficiency (over 7%) achieved use 40 000 g mol−1. As service to our authors readers, this journal provides supporting information supplied authors. Such materials are peer...
The crystal structure transforms from orthorhombic to tetragonal at 88 °C and then cubic 130 °C.
Abstract The authors investigate how chiral ligands attached to perovskite nanocrystal (PNC) surfaces structurally distort the lattice. Chiral electro‐optical properties of resulting PNCs are demonstrated through fabrication a circularly polarized light (CPL) detector with discrimination up 14% between left‐ and right‐handed CPL. Both experimental electronic‐structure‐based simulations combined provide insights into interactions (both structural electronic) organic PNCs. major finding is...
Ternary solar cells enjoy both an increased light absorption width, and easy fabrication process associated with their simple structures. Significant progress has been made for such demonstrated efficiencies over 7%; however, fundamental working principles are still under investigation. This Perspective is intended to offer our insights on the three major governing mechanisms in these intriguing ternary cells: charge transfer, energy parallel-linkage. Through careful analysis of exemplary...
This work describes a process to make anodes for organic solar cells from copper–nickel nanowires with solution-phase processing. Copper nanowire films were coated solution onto glass and made conductive by dipping them in acetic acid. Acetic acid removes the passivating oxide surface of copper nanowires, thereby reducing contact resistance between nearly same extent as hydrogen annealing. Films oxidation resistant silver under dry humid conditions an electroless nickel plating solution....
A sequential-casting ternary method is developed to create stratified bulk heterojunction (BHJ) solar cells, in which the two BHJ layers are spin cast sequentially without need of adopting a middle electrode and orthogonal solvents. This found be particularly useful for polymers that form mechanically alloyed morphology due high degree miscibility blend.
We report 2D hybrid perovskites comprising a blend of chiral arylammonium and achiral alkylammonium spacer cations (1:1 mole ratio). These new feature an unprecedented combination chirality alkyl-aryl functionality alongside noncovalent intermolecular interactions (e.g., CH···π interactions), determined by their crystal structures. The mixed-cation exhibit circular dichroism that is markedly different from the purely cation analogues, offering avenues to tune chiroptical properties known...
Abstract Introducing chirality into organic/inorganic hybrid materials can impart chiroptical properties such as circular dichroism. The ability to tune in self‐assembled have important implications for spintronic and optoelectronic applications. Here, a chiral organic cation, ( R/S )‐4‐methoxy‐α‐methylbenzylammonium, is incorporated synthesize the bismuth‐based organic–inorganic metal halide semiconductor, ‐MeOMePMA)BiI 4 . Thin films of this Bi‐based compound demonstrate large responses,...
Chitosan and its various neutral pH water-soluble derivatives were investigated for dispersing single-walled carbon nanotubes (SWNTs). (CS) can produce good dispersion of SWNTs, but only in acidic condition. Our two novel derivatives, O-carboxymethylchitosan (OC) OC modified by poly(ethylene glycol) at the −COOH position (OPEG), able to highly effective debundling SWNTs aqueous solution. Atomic force microscopy (AFM), transmission electron (TEM), photoluminescence, UV−vis−NIR spetroscopy,...
Two-dimensional (2D) perovskite quantum wells are generating broad scientific interest because of their potential for use in optoelectronic devices. Recently, it has been shown that layers 2D perovskites can be grown which the average thicknesses increase from back to front film. This geometry carries implications light harvesting applications bandgap a well decreases as its thickness increases. The general structural formula systems under investigation this work is (PEA)2(MA)n−1[PbnI3n+1]...
Two-dimensional (2D) organic–inorganic hybrid perovskites (OIHPs) have showed impressive stability, compared to their three-dimensional (3D) counterparts. However, tuning the chemical structure of organic cations simultaneously improve device performance and stability 2D OIHP solar cells is rarely reported. Here, we demonstrate that by introducing a classic noncovalent aryl-perfluoroaryl interaction, with 1:1 mixed phenethylammonium (PEA) perfluorophenethylammonium (F5-PEA) can achieve an...
As a high-performing, medium band gap donor polymer achieving over 7% in bulk heterojunction (BHJ) solar cells with thick active layer, PBnDT-FTAZ has demonstrated unique photovoltaic properties that have not yet been fine-tuned. In this study, three new polymers (PSBnDT-FTAZ, PBnDT-SeFTAZ, and PSBnDT-SeFTAZ) are designed to determine how the FTAZ system would respond further structural modifications. Specifically, we aimed answer (a) whether alkylthio substitution could increase open...
Triazole based structural units have been widely used to construct conjugated polymers for optoelectronic applications; yet the design and synthesis of such limited just a few known examples. We report general versatile synthetic approach toward diverse set triazole molecules bearing various electron accepting abilities. The differences as-synthesized three new acceptors significant impact on properties incorporating these triazoles. Bulk heterojunction solar cells one polymers, PyCNTAZ,...
Two-dimensional (2D) perovskites, with a formula of (RNH3)2MA n-1Pb nI3 n+1, have shown impressive photovoltaic device efficiency improved stability. The operating mechanism such devices is under debate and the scope incorporated organic cations (RNH3+) limited. We report general post-annealing method to incorporate variety into 2D which demonstrate significant efficiencies (7-12%). A detailed investigation archetypical (C4H9NH3)2MA3Pb4I13 ( n = 4) reveals that perovskites thin films contain...
Fluorinated conjugated polymers leading to enhanced photovoltaic device performance has been widely observed in a variety of donor–acceptor copolymers; however, almost all these have fluorine substituents on the acceptor unit. Building upon our previously reported PBnDT-FTAZ, fluorinated polymer with impressive performance, we set this study explore effect adding onto flanking thiophene units between donor unit (BnDT) and (TAZ). We developed new synthetic approaches control position...
D18 and its derivatives (such as D18-Cl) newly emerged high-performance conjugated polymers for bulk heterojunction (BHJ) solar cells, with efficiency breaching 17% when paired small molecule acceptors such Y6 derivatives. However, the complex synthesis of series has limited their accessibility to research community. We redesigned original synthetic scheme D18, particularly key monomer, 5,8-bis(5-bromo-4-(2-butyloctyl)thiophen-2-yl)dithieno[3′,2′:3,4;2″,3″:5,6]benzo[1,2-c][1,2,5]thiadiazole...
A triplet can annihilate with a charge or triplet, generating triplet–charge annihilation (TCA) triplet–triplet (TTA) in organic semiconductors. On one hand, the TCA and TTA are critical issues to improve optoelectronic responses by using states. other important spin-dependent processes generate magneto-optoelectronic responses. Our experimental studies find that is dominant process over Specifically, we separately confine triplets charges towards generation of adjusting density,...
Organic photovoltaics (OPVs) possess the advantageous trait of solution processability, yet OPV blends typically use hazardous chlorinated solvents for processing. In order to realize full advantages OPVs, as well growing an industrial scale, environmentally friendly processing OPVs needs be pursued. this study, we utilized well-studied polymer PBnDT-FTAZ system model conjugated polymer, and synthesized a series structurally similar polymers with oligo(ethylene glycol) (OEG) side-chains,...
The multi-layer metal/polymer/metal thin-film structure allows charge conduction but limits thermal conduction. is supported by Ohmic interfacial transfer and doped bulk transport. limited polymer low conductivity, acoustic mismatch, phonon scattering. As a result, the devices can demonstrate significant Seebeck effect.
Non-fullerene acceptors (NFAs) are becoming a serious contender to fullerene-based electron in organic photovoltaics, due their structural versatility and easily tunable optical electronic properties.