468 results found
Gedda M, Gkeka D, Nugraha MI, et al., 2022, High-Efficiency Perovskite-Organic Blend Light-Emitting Diodes Featuring Self-Assembled Monolayers as Hole-Injecting Interlayers, ADVANCED ENERGY MATERIALS, ISSN: 1614-6832
Liang J-W, Firdaus Y, Azmi R, et al., 2022, Cl-2-Doped CuSCN Hole Transport Layer for Organic and Perovskite Solar Cells with Improved Stability, ACS ENERGY LETTERS, Vol: 7, Pages: 3139-3148, ISSN: 2380-8195
Wahyudi W, Guo X, Ladelta V, et al., 2022, Hitherto Unknown Solvent and Anion Pairs in Solvation Structures Reveal New Insights into High-Performance Lithium-Ion Batteries, ADVANCED SCIENCE
Rotas G, Antoniou G, Papagiorgis P, et al., 2022, Doping-induced decomposition of organic semiconductors: a caveat to the use of Lewis acid p-dopants, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 10, Pages: 12751-12764, ISSN: 2050-7526
Bertrandie J, Han J, De Castro CSP, et al., 2022, The Energy Level Conundrum of Organic Semiconductors in Solar Cells, ADVANCED MATERIALS, Vol: 34, ISSN: 0935-9648
Li J, Song J, Luo L, et al., 2022, Synergy of MXene with Se Infiltrated Porous N-Doped Carbon Nanofibers as Janus Electrodes for High-Performance Sodium/Lithium-Selenium Batteries, ADVANCED ENERGY MATERIALS, Vol: 12, ISSN: 1614-6832
Nugraha MI, Gedda M, Firdaus Y, et al., 2022, Addition of diquat enhances the electron mobility in various non-fullerene acceptor molecules, Advanced Functional Materials, ISSN: 1616-301X
Molecular doping of organic semiconductors is often used to enhance their charge transport characteristics. Despite its success, however, most studies to date concern p-doping with considerably fewer reports involving n-dopants. Here, n-doping of organic thin-film transistors (OTFTs) based on several non-fullerene acceptor (NFA) molecules using the recently developed diquat (DQ) as a soluble molecular dopant is reported. The low ionization potential of DQ facilitates efficient electron transfer and subsequent n-doping of the NFAs, resulting in a consistent increase in the electron field-effect mobility. Solution-processed BTP-eC9 and N3-based OTFTs exhibit significant increase in the electron mobility upon DQ doping, with values increasing from 0.02 to 0.17 cm2 V–1 s–1 and from 0.2 to 0.57 cm2 V–1 s–1, respectively. A remarkable electron mobility of >1 cm2 V–1 s–1 is achieved for O-IDTBR transistors upon optimal doping with DQ. The enhanced performance originates primarily from synergistic effects on electronic transport and changes in morphology, including: i) significant reduction of contact resistances, ii) formation of larger crystalline domains, iii) change of preferred crystal orientation, and iv) alteration in molecular packing motif. This work demonstrates the universality of DQ as an electronic additive for improving electron transport in OTFTs.
Khan JI, Gedda M, Wang M, et al., 2022, Photophysics of Defect-Passivated Quasi-2D (PEA)(2)PbBr4 Perovskite Using an Organic Small Molecule, ACS ENERGY LETTERS, Vol: 7, Pages: 2450-2458, ISSN: 2380-8195
Xue F, Ma Y, Wang H, et al., 2022, Perspective Two-dimensional ferroelectricity and antiferroelectricity for next-generation computing paradigms, MATTER, Vol: 5, Pages: 1999-2014, ISSN: 2590-2393
Loganathan K, Faber H, Yengel E, et al., 2022, Rapid and up-scalable manufacturing of gigahertz nanogap diodes, NATURE COMMUNICATIONS, Vol: 13
Eisner F, Foot G, Yan J, et al., 2022, Emissive charge-transfer states at hybrid inorganic/organic heterojunctions enable low non-radiative recombination and high-performance photodetectors, Advanced Materials, Vol: 34, ISSN: 0935-9648
Hybrid devices based on a heterojunction between inorganic and organic semiconductors have offered a means to combine the advantages of both classes of materials in optoelectronic devices, but, in practice, the performance of such devices has often been disappointing. Here, it is demonstrated that charge generation in hybrid inorganic–organic heterojunctions consisting of copper thiocyanate (CuSCN) and a variety of molecular acceptors (ITIC, IT-4F, Y6, PC70BM, C70, C60) proceeds via emissive charge-transfer (CT) states analogous to those found at all-organic heterojunctions. Importantly, contrary to what has been observed at previous organic–inorganic heterojunctions, the dissociation of the CT-exciton and subsequent charge separation is efficient, allowing the fabrication of planar photovoltaic devices with very low non-radiative voltage losses (0.21 ± 0.02 V). It is shown that such low non-radiative recombination enables the fabrication of simple and cost-effective near-IR (NIR) detectors with extremely low dark current (4 pA cm−2) and noise spectral density (3 fA Hz−1/2) at no external bias, leading to specific detectivities at NIR wavelengths of just under 1013 Jones, close to the performance of commercial silicon photodetectors. It is believed that this work demonstrates the possibility for hybrid heterojunctions to exploit the unique properties of both inorganic and organic semiconductors for high-performance opto-electronic devices.
Wijeyasinghe N, Solomeshch O, Tessler N, et al., 2022, Radiofrequency Schottky Diodes Based on p-Doped Copper(I) Thiocyanate (CuSCN), ACS APPLIED MATERIALS & INTERFACES, ISSN: 1944-8244
Firdaus Y, He Q, Muliani L, et al., 2022, Charge transport and recombination in wide-bandgap Y6 derivatives-based organic solar cells, ADVANCES IN NATURAL SCIENCES-NANOSCIENCE AND NANOTECHNOLOGY, Vol: 13, ISSN: 2043-6254
Gagaoudakis E, Kampitakis V, Moschogiannaki M, et al., 2022, Low-energy consumption CuSCN-based ultra-low-ppb level ozone sensor, operating at room temperature, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 338, ISSN: 0924-4247
Deswal S, Panday R, Naphade DR, et al., 2022, Efficient Piezoelectric Energy Harvesting from a Discrete Hybrid Bismuth Bromide Ferroelectric Templated by Phosphonium Cation, CHEMISTRY-A EUROPEAN JOURNAL, Vol: 28, ISSN: 0947-6539
Liang J-W, Firdaus Y, Kang CH, et al., 2022, Chlorine-Infused Wide-Band Gap p-CuSCN/n-GaN Heterojunction Ultraviolet-Light Photodetectors, ACS APPLIED MATERIALS & INTERFACES, Vol: 14, Pages: 17889-17898, ISSN: 1944-8244
Jacoutot P, Scaccabarozzi AD, Zhang T, et al., 2022, Infrared organic photodetectors employing ultralow bandgap polymer and non-fullerene acceptors for biometric monitoring, Small, Vol: 18, Pages: 1-10, ISSN: 1613-6810
Recent efforts in the field of organic photodetectors (OPD) have been focused on extending broadband detection into the near-infrared (NIR) region. Here, two blends of an ultralow bandgap push–pull polymer TQ-T combined with state-of-the-art non-fullerene acceptors, IEICO-4F and Y6, are compared to obtain OPDs for sensing in the NIR beyond 1100 nm, which is the cut off for benchmark Si photodiodes. It is observed that the TQ-T:IEICO-4F device has a superior IR responsivity (0.03 AW-1 at 1200 nm and −2 V bias) and can detect infrared light up to 1800 nm, while the TQ-T:Y6 blend shows a lower responsivity of 0.01 AW-1. Device physics analyses are tied with spectroscopic and morphological studies to link the superior performance of TQ-T:IEICO-4F OPD to its faster charge separation as well as more favorable donor–acceptor domains mixing. In the polymer blend with Y6, the formation of large agglomerates that exceed the exciton diffusion length, which leads to high charge recombination, is observed. An application of these devices as biometric sensors for real-time heart rate monitoring via photoplethysmography, utilizing infrared light, is demonstrated.
Kosco J, Gonzalez Carrero S, Howells CT, et al., 2022, Generation of long-lived charges in organic semiconductor heterojunction nanoparticles for efficient photocatalytic hydrogen evolution, Nature Energy, Vol: 7, Pages: 340-351, ISSN: 2058-7546
Organic semiconductor photocatalysts for the production of solar fuels are attractive as they can be synthetically tuned to absorb visible light while simultaneously retaining suitable energy levels to drive a range of processes. However, a greater understanding of the photophysics that determines the function of organic semiconductor heterojunction nanoparticles is needed to optimize performance. Here, we show that such materials can intrinsically generate remarkably long-lived reactive charges, enabling them to efficiently drive sacrificial hydrogen evolution. Our optimized hetereojunction photocatalysts comprise the conjugated polymer PM6 matched with Y6 or PCBM electron acceptors, and achieve external quantum efficiencies of 1.0% to 5.0% at 400 to 900 nm and 8.7% to 2.6% at 400 to 700 nm, respectively. Employing transient and operando spectroscopies, we find that the heterojunction structure in these nanoparticles greatly enhances the generation of long-lived charges (millisecond to second timescale) even in the absence of electron/hole scavengers or Pt. Such long-lived reactive charges open potential applications in water-splitting Z-schemes and in driving kinetically slow and technologically desirable oxidations.
Azmi R, Ugur E, Seitkhan A, et al., 2022, Damp heat-stable perovskite solar cells with tailored-dimensionality 2D/3D heterojunctions, SCIENCE, Vol: 376, Pages: 73-+, ISSN: 0036-8075
Karuthedath S, Firdaus Y, Scaccabarozzi AD, et al., 2022, Trace Solvent Additives Enhance Charge Generation in Layer-by-Layer Coated Organic Solar Cells, SMALL STRUCTURES, Vol: 3
Aydin E, El-Demellawi JK, Yarali E, et al., 2022, Scaled Deposition of Ti3C2Tx MXene on Complex Surfaces: Application Assessment as Rear Electrodes for Silicon Heterojunction Solar Cells, ACS NANO, Vol: 16, Pages: 2419-2428, ISSN: 1936-0851
Kumar P, Wahyudi W, Sharma A, et al., 2022, Bismuth-based mixed-anion compounds for anode materials in rechargeable batteries, CHEMICAL COMMUNICATIONS, Vol: 58, Pages: 3354-3357, ISSN: 1359-7345
Aniés F, Qiao Z, Nugraha MI, et al., 2022, N-type polymer semiconductors incorporating para, meta, and ortho-carborane in the conjugated backbone, Polymer, Vol: 240, Pages: 124481-124481, ISSN: 0032-3861
We report on three novel n-type conjugated polymer semiconductors incorporating carborane in the polymer backbone and demonstrate their applicability in optoelectronic devices. Comparing the optoelectronic properties of para-, meta-, and ortho-carborane isomers revealed similar energetic characteristics between the different polymers, with the carborane unit acting as a “conjugation breaker”, confining electron delocalisation to the conjugated moieties. The fabrication of all-polymer organic photovoltaic (OPV) devices and thin-film transistors (TFTs) revealed some differences in device performance between the polymers, with the meta-carborane based polymer exhibiting superior performance in both OPV and TFT devices.
Dauzon E, Sallenave X, Plesse C, et al., 2022, Versatile methods for improving the mechanical properties of fullerene and non-fullerene bulk heterojunction layers to enable stretchable organic solar cells, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 10, Pages: 3375-3386, ISSN: 2050-7526
Corzo D, Wang T, Gedda M, et al., 2022, A Universal Cosolvent Evaporation Strategy Enables Direct Printing of Perovskite Single Crystals for Optoelectronic Device Applications, ADVANCED MATERIALS, Vol: 34, ISSN: 0935-9648
Loganathan K, Scaccabarozzi AD, Faber H, et al., 2022, 14 GHz schottky diodes using a p-doped organic polymer., Advanced Materials, Vol: 34, Pages: 1-8, ISSN: 0935-9648
The low carrier mobility of organic semiconductors and the high parasitic resistance and capacitance often encountered in conventional organic Schottky diodes, hinder their deployment in emerging radio frequency (RF) electronics. Here we overcome these limitations by combining self-aligned asymmetric nanogap electrodes (∼25 nm) produced by adhesion-lithography, with a high mobility organic semiconductor and demonstrate RF Schottky diodes able to operate in the 5G frequency spectrum. We used C16 IDT-BT, as the high hole mobility polymer, and studied the impact of p-doping on the diode performance. Pristine C16 IDT-BT-based diodes exhibit maximum intrinsic and extrinsic cutoff frequencies (fC ) of >100 and 6 GHz, respectively. This extraordinary performance is attributed primarily to the planar nature of the nanogap channel and the diode's small junction capacitance (< 2 pF). Doping of C16 IDT-BT with the molecular p-dopant C60 F48 , improves the diode's performance further by reducing the series resistance resulting to intrinsic and extrinsic fC of >100 and ∼14 GHz respectively, while the DC output voltage of a RF rectifier circuit increases by a tenfold. Our work highlights the importance of the planar nanogap architecture and paves the way for the use of organic Schottky diodes in large-area radio frequency electronics of the future. This article is protected by copyright. All rights reserved.
Kafourou P, Nugraha MI, Nikitaras A, et al., 2021, Near-IR absorbing molecular semiconductors incorporating cyanated benzothiadiazole acceptors for high performance semi-transparent n-type organic field-effect transistors, ACS Materials Letters, Vol: 4, Pages: 165-174, ISSN: 2639-4979
Small band gap molecular semiconductors are of interest for the development of transparent electronics. Here we report two near-infrared (NIR), n-type small molecule semiconductors, based upon an acceptor-donor-acceptor (A-D-A) approach. We show that the inclusion of molecular spacers between the strong electron accepting end group, 2,1,3-benzothiadiazole-4,5,6-tricarbonitrile, and the donor core affords semiconductors with very low band gaps down to 1 eV. Both materials were synthesised by a one-pot, sixfold nucleophilic displacement of a fluorinated precursor by cyanide. Significant differences in solid-state ordering and charge carrier mobility are observed depending on the nature of the spacer, with a thiophene spacer resulting in solution processed organic field-effect transistors (OFETs) exhibiting excellent electron mobility up to 1.1 cm2 V-1s-1. The use of silver nanowires as the gate electrodes enables the fabrication of semi-transparent OFET device with average visible transmission of 71% in the optical spectrum.
Liu J, Aydin E, Yin J, et al., 2021, 28.2%-efficient, outdoor-stable perovskite/silicon tandem solar cell, JOULE, Vol: 5, Pages: 3169-3186, ISSN: 2542-4351
Gutierrez-Fernandez E, Scaccabarozzi AD, Basu A, et al., 2021, Y6 Organic Thin-Film Transistors with Electron Mobilities of 2.4 cm(2) V-1 s(-1) via Microstructural Tuning, ADVANCED SCIENCE, Vol: 9
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