A5100716066- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Mercury impact and mitigation studies
- Air Quality and Health Impacts
- Organic Light-Emitting Diodes Research
- ZnO doping and properties
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Nanowire Synthesis and Applications
- Semiconductor materials and interfaces
- Laser-induced spectroscopy and plasma
- Optical Coatings and Gratings
- Polysaccharides and Plant Cell Walls
- Solid-state spectroscopy and crystallography
- Advanced Fiber Optic Sensors
- Heavy Metal Exposure and Toxicity
- Antioxidant Activity and Oxidative Stress
- Advanced battery technologies research
- Gas Sensing Nanomaterials and Sensors
- Chalcogenide Semiconductor Thin Films
- Graphene research and applications
- GaN-based semiconductor devices and materials
- Molecular Junctions and Nanostructures
Peking University
2024
North Minzu University
2024
Zhejiang University of Water Resource and Electric Power
2023-2024
Hebei University
2023
Guangzhou University
2023
China University of Petroleum, East China
2023
Tianjin Medical University
2022
Harbin Institute of Technology
2006-2021
Xi'an Jiaotong University
2021
Renmin University of China
2012-2020
Characteristics of nanoscale materials are often different from the corresponding bulk properties providing new, sometimes unexpected, opportunities for applications. Here we investigate 8 nm colloidal nanoparticles MAPbBr3 perovskites and contrast them to ones large microcrystallites representing a bulk. X-ray spectroscopies provide an exciton binding energy 0.32 ± 0.10 eV in nanoparticles. This is 5 times higher than value crystals (0.084 0.010 eV), readily explains high fluorescence...
Abstract Additive engineering can precisely regulate the bulk‐heterojunction active layer morphology with ideal domain size and purity, playing a critical role in development of organic solar cells (OSCs). Herein, two solid additives, 1,4‐dichlorobenzene (DCB) 1‐chloro‐4‐iodobenzene (CIB), low melting point (mp.) ≈52 °C, are investigated comprehensively comparison to 1,4‐diiodobenzene (DIB, mp. 131 °C). After spin‐coating, DIB residue is found as‐cast PM6:BTP‐eC9 based blend film, whereas...
Abstract Protecting the environment and enhancing food security are among world’s greatest challenges. Fish consumption is widely considered to be single significant dietary source of methylmercury. Nevertheless, by synthesizing data from past six decades using a variety models, we find that rice could global human methylmercury exposure, especially in South Southeast Asia. In 2013, globalization caused 9.9% exposure via international trade significantly aggravated rice-derived Africa (62%),...
We investigated the excited-state dynamics of CH3NH3PbBr3 perovskite nanoparticles (NPs) and bulk crystals under various excitation intensity regimes using transient absorption spectroscopy. confirmed sub-band gap hole trap states with optical transition to conduction band in both samples. In crystals, is independent pump intensity. However, NPs, pronounced dependence appears. At low intensities, do not affect due potential barrier between photogenerated holes surface states. When density...
Semiconductor quantum dot (QD) to metal oxide electron injection dynamics is well documented in the scientific literature. In contrast that, not much known so far about hole time scales such systems. The current study fills this gap. We investigate photocathodes consisting of CdSe QDs and p-type NiO from valence band NiO. combination two complementary techniques, ultrafast time-resolved absorption fluorescence spectroscopies, enabled us distinguish between trapping injection. A kinetic...
The primary dynamics of exciton and charge photogeneration in the neat P3HT (poly(3-hexylthiophene)) blend P3HT/PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) films were investigated by use near-infrared femtosecond transient absorption spectroscopy with varying excitation photon energy fluence. effects film morphology examined comparing solvent vapor annealed (SVA) carbon disulfide (CS2) cast films. Spectroelectrochemistry was employed to characterize cationic polaron P3HT•+ facilitate...
Abstract A pair of polymers, PBDTBT and PBDTDTBT , was synthesized for application in polymer solar cells (PSCs). Although these two polymers have similar absorption bands molecular energy levels, exhibits much better photovoltaic performance cell (PSC) devices with power conversion efficiency (PCE) 7.4%. To understand the differences between we investigated correlations structure, morphology, dynamics polymers. theoretical investigation using density functional theory (DFT) time‐dependent...
Abstract A new strategy for designing ternary solar cells is reported in this paper. low‐bandgap polymer named PTB7‐Th and a high‐bandgap PBDTTS‐FTAZ sharing the same bulk ionization potential interface positive integer charge transfer energy while featuring complementary absorption spectra are selected. They used to fabricate efficient cells, where hole can be transported freely between two donor polymers collected by electrode as one broadband low bandgap polymer. Furthermore, fullerene...
In this work, a refractive index sensor structure is proposed, which consists of the met-al-insulator-metal (MIM) waveguide coupling with ring resonator rectangular cavity. Its sensing characteristics are analyzed by finite element analysis method. SPPs an electromagnetic wave mode excited oscillatory free electron-photon interactions on surface region metal, whose field strength maximum at metal-dielectric partition interface and then decays exponentially to both sides The results show that...
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Photovoltaic Properties of Low Band Gap Polymers Containing Benzo[1,2-b:4,5-c′]dithiophene-4,8-dioneJiamin Cao†‡, Wei Zhang‡, Zuo Xiao‡, Lingyan Liao‡, Weiguo Zhu*†, Qiqun Zuo§, Liming Ding*‡View Author Information† Key Lab Environment-Friendly Chemistry Application the Ministry Education, College Chemistry, Xiangtan University, 411105, China‡ National Center for Nanoscience Technology, No. 11 Beiyitiao, Zhongguancun, Beijing 100190,...
Two photon photoluminescence (2PPL) from single crystals of methyl ammonium lead bromide (CH3NH3PbBr3, MAPbBr3) is studied. We observe two components in the 2PPL spectra, which we assign to (PL) carrier recombination at band edge and due self-trapping excitons. The PL Stokes shift self-trapped excitons about 100 meV band-gap energy. Our measurements show that 15% total regions 40 μm deep inside crystal emission exciton. This contribution increases 20% close surface. Time resolved band-edge...
We have grown GaAsP nanowires with high optical and structural quality by Aerotaxy, a new continuous gas phase mass production process to grow III-V semiconductor based nanowires. By varying the PH3/AsH3 ratio growth temperature, size selected GaAs1-xPx (80 nm diameter) pure zinc-blende structure direct band gap energies ranging from 1.42 1.90 eV (at 300 K), (i.e., 0 ≤ x 0.43) were grown, which is energy range needed for creating tandem solar cells on silicon. The phosphorus content in NWs...
Abstract. Located in the world's “third pole” and a remote region connecting Indian plate Eurasian plate, Qomolangma National Nature Preserve (QNNP) is an ideal to study long-range transport of atmospheric pollutants. In this study, gaseous elemental mercury (GEM), oxidized (GOM) particle-bound (PBM) were continuously measured during monsoon transition period QNNP. A slight increase GEM concentration was observed from preceding summer (1.31±0.42 ng m−3) (1.44±0.36 m−3), while significant...
The synthesis and characterization of fluorinated carbon nanotubes have been carried out under an inert gas containing fluorine. All the samples characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), solid-state nuclear magnetic resonance ((13)C (19)F ss-NMR) transmission electron microscopy (TEM) techniques. comparison effects various experimental parameters on structure materials allows disclosure fluorination mechanism. It is shown that fluorine was...
Stabilizing the optimal film morphology of bulk heterojunction polymer solar cells is key for realizing long-term stable devices. A crosslinker, octane-1,8-diyl bis(1,4-dihydrobenzo[d][1,2]oxathiine-6-carboxylate 3-oxide) (OBOCO), was designed to crosslink PC61BM through a heat-triggered Diels–Alder reaction suppress aggregation tendency fullerene molecules, thus helping stabilize and improve device stability. Devices containing OBOCO (0–25% wt) in active layer were fabricated studied....
In order to investigate anthropometric effects of mercury (Hg) exposure, we examined the status human prenatal exposure Hg species, including total (THg), methylmercury (MeHg) and inorganic (IHg), in North China, as well their potential on fetal infant growth. concentrations various bioindicators were measured from 50 Chinese women newborns 2011. The participants followed for 12 months collect information. Linear two-level regression analyses performed determine associations between levels...
Measuring lifetime of photogenerated charges in semiconductor nanowires (NW) is important for understanding light-induced processes these materials and relevant their photovoltaic photodetector applications. In this paper, we investigate the dynamics charge carriers a series as-grown InP NW with different levels sulfur (S) doping. We observe that photoluminescence (PL) decay time as well integrated PL intensity decreases increasing S attribute observations to hole trapping trap density...