A5090037957- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Perovskite Materials and Applications
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Nanowire Synthesis and Applications
- Advanced Optical Sensing Technologies
- Silicon Nanostructures and Photoluminescence
- Luminescence and Fluorescent Materials
- ZnO doping and properties
- Ocular and Laser Science Research
- Nonlinear Differential Equations Analysis
- Contact Mechanics and Variational Inequalities
- Gold and Silver Nanoparticles Synthesis and Applications
- Nonlinear Partial Differential Equations
- Copper-based nanomaterials and applications
- Laser-Ablation Synthesis of Nanoparticles
- Photonic and Optical Devices
Massachusetts Institute of Technology
2014-2018
National Tsing Hua University
2013-2014
National Taiwan University
2008-2010
This work presents polymer photovoltaic devices based on poly(3-hexylthiophene) (P3HT) and TiO2 nanorod hybrid bulk heterojunctions. Interface modification of a surface is conducted to yield very promising device performance 2.20% with short circuit current density (Jsc) 4.33 mA/cm2, an open voltage (Voc) 0.78 V, fill factor (FF) 0.65 under simulated A.M. 1.5 illumination (100 mW/cm2). The suppression recombination at P3HT/TiO2 interfaces by the attachment effective ligand molecules...
Quantum dot photovoltaics (QDPV) offer the potential for low-cost solar cells. To develop strategies continued improvement in QDPVs, a better understanding of factors that limit their performance is essential. Here, we study carrier recombination processes power conversion efficiency PbS QDPVs. We demonstrate presence radiative sub-bandgap states and state filling operating devices by using photoluminescence (PL) electroluminescence (EL) spectroscopy. These are most likely origin high...
Chemical oxidation of under-charged Pb atoms reduces the density trap states by a factor 40 in films colloidal PbS quantum dots for devices. These emissive sub-bandgap are byproduct several standard ligand-exchange procedures. X-ray photoelectron spectro-scopy measurements and function theory simulations demonstrate that they associated with Pb.
Lead sulfide quantum dot (QD) solar cells employing an ordered bulk heterojunction with ZnO nanowires and band alignment engineering of the QD film achieve photocurrent density greater than 30 mA cm−2, highest reported for a photovoltaic (PV) device ideal gap 1.3 eV. This record performance is shown to be result simultaneous improvement in light harvesting carrier collection efficiency, these effects are generalizable other PV absorber materials. As service our authors readers, this journal...
A novel series of soluble alternating conjugated copolymers, comprised 9,9-dihexylfluorene and cyclopentadithiophenes (P1−P5), were synthesized via Pd-catalyzed Suzuki coupling reaction in good yields. The UV−vis absorption spectra, fluorescence quantum yields, cyclic voltammograms P1−P5 are also reported. P2 P3 with electron-donating non-π-substituents (ethylenedioxy propylenedioxy bridges the 3,3-positions thiophene groups) display high yields red-shifted as compared nonsubstituted P1....
Lead sulfide quantum dots (PbS QDs) are an attractive material system for the development of low-cost photovoltaics (PV) due to their ease processing and stability in air, with certified power conversion efficiencies exceeding 11%. However, even best PbS QD PV devices limited by diffusive transport, as optical absorption length exceeds minority carrier diffusion length. Understanding transport these will therefore be critical future efficiency improvement. We utilize cross-sectional electron...
The use of zinc oxide (ZnO) nanowires improves charge collection, and consequently power conversion efficiency, in quantum dot (QD) based photovoltaic devices. However, the role nanowire geometry (e.g., density, length, morphology, etc.) relative to QD properties remains unexplored, part due challenges with controlled synthesis. Here, we independently tailor length active device layer thickness study collection lead sulfide (PbS) We then demonstrate consistently high internal efficiency...
We present a simple approach by using mixed solvent to control the morphology of poly(3-hexylthiophene) (P3HT)/TiO2 nanorod hybrid bulk heterojunction solar cells without any post-treatment. The effects controlled on optical and electrical properties are investigated. It has been challenge disperse polar inorganic nanocrystals at relative high concentration into nonpolar polymer. use which consists pyridine (a poor for P3HT), dichloromethane, chloroform good P3HT) modifies nanoscale...
In this study, a two-dimension array of InGaAs photodiode with 0.9~1.7nm absorption wavelength was presented. By using the characteristic wide range in material, we designed several active regions our novel devices for inducing expected photocurrent. While distances between light source and these equal-area increases, found current generated decreases non-linearly. Furthermore, device applied on detecting skin physiology, when tungsten bulk penetrated through absorbed by photodiode, there...