380 results found
Li W, Yarali E, Bakytbekov A, et al., 2020, Highly transparent and conductive electrodes enabled by scalable printing-and-sintering of silver nanowires, NANOTECHNOLOGY, Vol: 31, ISSN: 0957-4484
Mohan L, Ratnasingham SR, Panidi J, et al., 2020, Low Temperature Scalable Deposition of Copper(I) Thiocyanate Films via Aerosol-Assisted Chemical Vapor Deposition, Crystal Growth & Design, ISSN: 1528-7483
Zhang S, Tang M-C, Fan Y, et al., 2020, Role of Alkali-Metal Cations in Electronic Structure and Halide Segregation of Hybrid Perovskites., ACS Appl Mater Interfaces
The ability to control or prevent phase segregation in perovskites is crucial to realizing stable and tunable mixed-halide optoelectronic devices. In this work, we systematically examine the impact of alkali-metal-cation (Cs+ and K+) concentration on the band structure, chemical composition, phase segregation, and polycrystalline microstructure on formamidinium-dominated mixed-halide mixed-cation perovskite films. It was found that the incorporation of Cs+ and K+ cations decreases the work function and the core levels of all components shift toward higher binding energy consistent with n-doping the perovskite film, which facilitates electron transfer to the electron transport layer TiO2. A concentration-dependent film structure was observed by X-ray photoemission spectroscopy and grazing incidence wide-angle X-ray scattering where the halides and cations are distributed evenly across perovskite films at low metallic cation concentration (5%). A high metal-cation ratio (20%) leads to halide segregation within the perovskite film and the surface becomes bromide-poor, whereas the bromide and metal cations diffuse more deeply within the film. These differences in electronic properties, element distribution, and film morphology were reflected in the device performance where the power conversion efficiency of low-metallic-cation concentration (5% of Cs+ and K+) perovskite solar cells is ≈5% higher than the high-concentration ones (20%). This study provides valuable chemical and physical insight into the underlying trade-offs in the careful tuning of electrical properties and film structure to optimize multication and mixed-halide hybrid perovskites.
Anies F, Wang S, Hodsden T, et al., 2020, A Structurally Simple but High-Performing Donor-Acceptor Polymer for Field-Effect Transistor Applications, ADVANCED ELECTRONIC MATERIALS, ISSN: 2199-160X
Nugraha MI, Yarali E, Firdaus Y, et al., 2020, Rapid Photonic Processing of High-Electron-Mobility PbS Colloidal Quantum Dot Transistors., ACS Appl Mater Interfaces, Vol: 12, Pages: 31591-31600
Recent advances in solution-processable semiconducting colloidal quantum dots (CQDs) have enabled their use in a range of (opto)electronic devices. In most of these studies, device fabrication relied almost exclusively on thermal annealing to remove organic residues and enhance inter-CQD electronic coupling. Despite its widespread use, however, thermal annealing is a lengthy process, while its effectiveness to eliminate organic residues remains limited. Here, we exploit the use of xenon flash lamp sintering to post-treat solution-deposited layers of lead sulfide (PbS) CQDs and their application in n-channel thin-film transistors (TFTs). The process is simple, fast, and highly scalable and allows for efficient removal of organic residues while preserving both quantum confinement and high channel current modulation. Bottom-gate, top-contact PbS CQD TFTs incorporating SiO2 as the gate dielectric exhibit a maximum electron mobility of 0.2 cm2 V-1 s-1, a value higher than that of control transistors (≈10-2 cm2 V-1 s-1) processed via thermal annealing for 30 min at 120 °C. Replacing SiO2 with a polymeric dielectric improves the transistor's channel interface, leading to a significant increase in electron mobility to 3.7 cm2 V-1 s-1. The present work highlights the potential of flash lamp annealing as a promising method for the rapid manufacture of PbS CQD-based (opto)electronic devices and circuits.
Cheng F, Verrelli E, Alharthi FA, et al., 2020, Solution-processable and photopolymerisable TiO<inf>2</inf>nanorods as dielectric layers for thin film transistors, RSC Advances, Vol: 10, Pages: 25540-25546
© The Royal Society of Chemistry. We report the fabrication of a solution-processed n-type Thin Film Transistor (TFT) with current on/off ratios of 104, a turn-on voltage (VON) of 1.2 V and a threshold voltage (VT) of 6.2 V. The TFT incorporates an insoluble and intractable dielectric layer (k = 7-9) prepared in situ from solution-processed and then photopolymerised ligand-stabilised, inorganic/organic TiO2 nanorods. A solution processed zinc oxide (ZnO) layer acts as the semiconductor. The new surface-modified TiO2 nanorods were synthesised using a ligand replacement process with a monolayer coating of photopolymerisable 10-undecynylphosphonic acid (10UCYPA) to render them both soluble in common organic solvents and be photopolymerisable using UV-illumination after having been deposited on substrate surfaces from solution and drying.
Tang M-C, Fan Y, Barrit D, et al., 2020, Efficient Hybrid Mixed-Ion Perovskite Photovoltaics: In Situ Diagnostics of the Roles of Cesium and Potassium Alkali Cation Addition, SOLAR RRL, ISSN: 2367-198X
Yang X, Lin Y, Liu J, et al., 2020, A Highly Conductive Titanium Oxynitride Electron-Selective Contact for Efficient Photovoltaic Devices, ADVANCED MATERIALS, ISSN: 0935-9648
Kirmani AR, Eisner F, Mansour AE, et al., 2020, Colloidal Quantum Dot Photovoltaics Using Ultrathin, Solution-Processed Bilayer In2O3/ZnO Electron Transport Layers with Improved Stability, ACS APPLIED ENERGY MATERIALS, Vol: 3, Pages: 5135-5141, ISSN: 2574-0962
Paterson AF, Savva A, Wustoni S, et al., 2020, Water stable molecular n-doping produces organic electrochemical transistors with high transconductance and record stability, NATURE COMMUNICATIONS, Vol: 11, ISSN: 2041-1723
Lin Y-H, Huang W, Pattanasattayavong P, et al., 2020, Deciphering photocarrier dynamics for tuneable high-performance perovskite-organic semiconductor heterojunction phototransistors (vol 10, 4475, 2019), NATURE COMMUNICATIONS, Vol: 11, ISSN: 2041-1723
Dauzon E, Lin Y, Faber H, et al., 2020, Stretchable and Transparent Conductive PEDOT:PSS-Based Electrodes for Organic Photovoltaics and Strain Sensors Applications, ADVANCED FUNCTIONAL MATERIALS, Vol: 30, ISSN: 1616-301X
Khan JI, Firdaus Y, Cruciani F, et al., 2020, Thienyl Sidechain Substitution and Backbone Fluorination of Benzodithiophene-Based Donor Polymers Concertedly Minimize Carrier Losses in ITIC-Based Organic Solar Cells, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 124, Pages: 10420-10429, ISSN: 1932-7447
Ho CHY, Kim T, Xiong Y, et al., 2020, High-Performance Tandem Organic Solar Cells Using HSolar as the Interconnecting Layer, ADVANCED ENERGY MATERIALS, Vol: 10, ISSN: 1614-6832
Yarali E, Faber H, Yengel E, et al., 2020, Low-Voltage Heterojunction Metal Oxide Transistors via Rapid Photonic Processing, ADVANCED ELECTRONIC MATERIALS, Vol: 6, ISSN: 2199-160X
Anthopoulos TD, Noh Y-Y, Jurchescu OD, 2020, Emerging Thin-Film Transistor Technologies and Applications, ADVANCED FUNCTIONAL MATERIALS, Vol: 30, ISSN: 1616-301X
Ma C, Clark S, Liu Z, et al., 2020, Solution-Processed Mixed-Dimensional Hybrid Perovskite/Carbon Nanotube Electronics, ACS NANO, Vol: 14, Pages: 3969-3979, ISSN: 1936-0851
Hodsden T, Thorley KJ, Panidi J, et al., 2020, Core fluorination enhances solubility and ambient stability of an IDT‐based n‐type semiconductor in transistor devices, Advanced Functional Materials, Vol: 30, Pages: 1-12, ISSN: 1616-301X
The synthesis of a novel fluorinated n‐type small molecule based on an indacenodithiophene core is reported. Fluorination is found to have a significant impact on the physical properties, including a surprisingly dramatic improvement in solubility, in addition to effectively stabilizing the lowest‐unoccupied molecular orbital energy (−4.24 eV). Single‐crystal analysis and density functional theory calculations indicate the improved solubility can be attributed to backbone torsion resulting from the positioning of the fluorine group in close proximity to the strongly electron‐withdrawing dicyanomethylene group. Organic thin‐film transistors made via blade coating display high electron mobility (up to 0.49 cm2 V−1 s−1) along with good retention of performance in ambient conditions.
Adilbekova B, Lin Y, Yengel E, et al., 2020, Liquid phase exfoliation of MoS2 and WS2 in aqueous ammonia and their application in highly efficient organic solar cells, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 8, Pages: 5259-5264, ISSN: 2050-7526
Zhou L, Cao Z, Wahyudi W, et al., 2020, Electrolyte Engineering Enables High Stability and Capacity Alloying Anodes for Sodium and Potassium Ion Batteries, ACS ENERGY LETTERS, Vol: 5, Pages: 766-776, ISSN: 2380-8195
Zheng X, Yuan S, Liu J, et al., 2020, Chlorine Vacancy Passivation in Mixed Halide Perovskite Quantum Dots by Organic Pseudohalides Enables Efficient Rec. 2020 Blue Light-Emitting Diodes, ACS ENERGY LETTERS, Vol: 5, Pages: 793-798, ISSN: 2380-8195
He Q, Shahid M, Jiao X, et al., 2020, The crucial role of fluorine in fully alkylated ladder type carbazole based non-fullerene organic solar cells, ACS Applied Materials and Interfaces, Vol: 12, Pages: 9555-9562, ISSN: 1944-8244
Two fused ladder type non-fullerene acceptors, DTCCIC and DTCCIC-4F, based on an electron-donating alkylated dithienocyclopentacarbazole core flanked by electron-withdrawing non-fluorinated or fluorinated 1,1-dicyanomethylene-3-indanone (IC or IC-4F), are prepared and utilized in organic solar cells (OSCs). The two new molecules reveal planar structures and strong aggregation behavior, and fluorination is shown to red shift the optical band gap and down shift energy levels. OSCs based on DTCCIC-4F exhibit a power conversion efficiency of 12.6 %, much higher than that of DTCCIC based devices (6.2 %). Microstructural studies reveal that while both acceptors are highly crystalline, bulk heterojunction blends based on the non-fluorinated DTCCIC result in overly coarse domains, while blends based on the fluorinated DTCCIC-4F exhibit a more optimal nanoscale morphology. These results highlight the importance of end group fluorination in controlling molecular aggregation and miscibility.
Lin Y, Firdaus Y, Nugraha MI, et al., 2020, 17.1% Efficient Single-Junction Organic Solar Cells Enabled by n-Type Doping of the Bulk-Heterojunction, ADVANCED SCIENCE, Vol: 7
Georgiadou DG, Lin Y, Lim J, et al., 2020, High Responsivity and Response Speed Single‐Layer Mixed‐Cation Lead Mixed‐Halide Perovskite Photodetectors Based on Nanogap Electrodes Manufactured on Large‐Area Rigid and Flexible Substrates, Advanced Functional Materials, Vol: 30, Pages: 1909758-1909758, ISSN: 1616-301X
Barrit D, Cheng P, Darabi K, et al., 2020, Room-Temperature Partial Conversion of alpha-FAPbI(3) Perovskite Phase via PbI2 Solvation Enables High-Performance Solar Cells, ADVANCED FUNCTIONAL MATERIALS, Vol: 30, ISSN: 1616-301X
Firdaus Y, He Q, Lin Y, et al., 2020, Novel wide-bandgap non-fullerene acceptors for efficient tandem organic solar cells, 10th International Conference on Materials for Advanced Technologies (ICMAT) / Symposium P on Advanced Inorganic Materials and Thin Film Technology for Solar Energy Harvesting and Electronic Application, Publisher: ROYAL SOC CHEMISTRY, Pages: 1164-1175, ISSN: 2050-7488
Tang M-C, Fan Y, Barrit D, et al., 2020, Ambient blade coating of mixed cation, mixed halide perovskites without dripping: in situ investigation and highly efficient solar cells, Publisher: ROYAL SOC CHEMISTRY, Pages: 1095-1104, ISSN: 2050-7488
Zheng X, Hou Y, Bao C, et al., 2020, Managing grains and interfaces via ligand anchoring enables 22.3%-efficiency inverted perovskite solar cells, NATURE ENERGY, Vol: 5, Pages: 131-140, ISSN: 2058-7546
Wadsworth A, Chen H, Thorley KJ, et al., 2020, Modification of Indacenodithiophene-Based Polymers and Its Impact on Charge Carrier Mobility in Organic Thin-Film Transistors, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 142, Pages: 652-664, ISSN: 0002-7863
Hallani RK, Moser M, Bristow H, et al., 2020, Low-Temperature Cross-Linking Benzocyclobutene Based Polymer Dielectric for Organic Thin Film Transistors on Plastic Substrates, JOURNAL OF ORGANIC CHEMISTRY, Vol: 85, Pages: 277-283, ISSN: 0022-3263
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