425 results found
Mohan L, Ratnasingham SR, Panidi J, et al., 2021, Determining Out-of-Plane Hole Mobility in CuSCN via the Time-of-Flight Technique To Elucidate Its Function in Perovskite Solar Cells, ACS APPLIED MATERIALS & INTERFACES, Vol: 13, Pages: 38499-38507, ISSN: 1944-8244
Dauzon E, Sallenave X, Plesse C, et al., 2021, Pushing the Limits of Flexibility and Stretchability of Solar Cells: A Review, ADVANCED MATERIALS, ISSN: 0935-9648
Zhang T, Moser M, Scaccabarozzi A, et al., 2021, Ternary organic photodetectors based on pseudo–binaries nonfullerene–based acceptors, Journal of Physics: Materials, Vol: 4, Pages: 1-8, ISSN: 2515-7639
The addition of a third component to a donor:acceptor blend is a powerful tool to enhance the power conversion efficiency of organic solar cells. Featuring a similar operating mechanism, organic photodetectors are also expected to benefit from this approach. Here, we fabricated ternary organic photodetectors, based on a polymer donor and two nonfullerene acceptors, resulting in a low dark current of 0.42 nA cm−2 at −2 V and a broadband specific detectivity of 1012 Jones. We found that exciton recombination in the binary blend is reduced in ternary devices due to the formation of a pseudo-binary microstructure with mixed donor–acceptor phases. With this approach a wide range of intermediate open-circuit voltages is accessible, without sacrificing light-to-current conversion. This results in ternary organic photodetector (TOPD) with improved Responsivity values in the near-infrared. Moreover, morphology analyses reveal that TOPD devices showed improved microstructure ordering and consequentially higher charge carrier mobilities compared to the reference devices.
Nam S, Khim D, Martinez GT, et al., 2021, Significant Performance Improvement in n-Channel Organic Field-Effect Transistors with C-60:C-70 Co-Crystals Induced by Poly(2-ethyl-2-oxazoline) Nanodots, ADVANCED MATERIALS, Vol: 33, ISSN: 0935-9648
Isikgor FH, Furlan F, Liu J, et al., 2021, Concurrent cationic and anionic perovskite defect passivation enables 27.4% perovskite/silicon tandems with suppression of halide segregation, JOULE, Vol: 5, Pages: 1566-1586, ISSN: 2542-4351
Zhang S, Tang M-C, Nguyen N, et al., 2021, Wide-Band-Gap Mixed-Halide 3D Perovskites: Electronic Structure and Halide Segregation Investigation, ACS APPLIED ELECTRONIC MATERIALS, Vol: 3, Pages: 2277-2285
Lin Y, Magomedov A, Firdaus Y, et al., 2021, 18.4 % Organic Solar Cells Using a High Ionization Energy Self-Assembled Monolayer as Hole-Extraction Interlayer, CHEMSUSCHEM, ISSN: 1864-5631
Marina S, Scaccabarozzi AD, Gutierrez-Fernandez E, et al., 2021, Polymorphism in Non-Fullerene Acceptors Based on Indacenodithienothiophene, ADVANCED FUNCTIONAL MATERIALS, Vol: 31, ISSN: 1616-301X
Troughton J, Neubert S, Gasparini N, et al., 2021, Efficient Hybrid Amorphous Silicon/Organic Tandem Solar Cells Enabled by Near-Infrared Absorbing Nonfullerene Acceptors, ADVANCED ENERGY MATERIALS, Vol: 11, ISSN: 1614-6832
Wahyudi W, Ladelta V, Tsetseris L, et al., 2021, Lithium-Ion Desolvation Induced by Nitrate Additives Reveals New Insights into High Performance Lithium Batteries, ADVANCED FUNCTIONAL MATERIALS, Vol: 31, ISSN: 1616-301X
Fallon KJ, Wijeyasinghe N, Leventis A, et al., 2021, Tyrian purple: an ancient natural dye for cross-conjugated n-type charge transport, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 9, Pages: 4200-4205, ISSN: 2050-7526
Kim H, Nugraha M, Guan X, et al., 2021, All-Solution-Processed Quantum Dot Electrical Double-Layer Transistors Enhanced by Surface Charges of Ti3C2Tx MXene Contacts, ACS NANO, Vol: 15, Pages: 5221-5229, ISSN: 1936-0851
Paterson AF, Li R, Markina A, et al., 2021, N-Doping improves charge transport and morphology in the organic non-fullerene acceptor O-IDTBR dagger, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 9, Pages: 4486-4495, ISSN: 2050-7526
Kafourou P, Park B, Luke J, et al., 2021, One‐step sixfold cyanation of benzothiadiazole acceptor units for air‐stable high‐performance n‐type organic field‐effect transistors, Angewandte Chemie, Vol: 133, Pages: 6035-6042, ISSN: 0044-8249
Reported here is a new high electron affinity acceptor end group for organic semiconductors, 2,1,3‐benzothiadiazole‐4,5,6‐tricarbonitrile (TCNBT). An n‐type organic semiconductor with an indacenodithiophene (IDT) core and TCNBT end groups was synthesized by a sixfold nucleophilic substitution with cyanide on a fluorinated precursor, itself prepared by a direct arylation approach. This one‐step chemical modification significantly impacted the molecular properties: the fluorinated precursor, TFBT IDT, a poor ambipolar semiconductor, was converted into TCNBT IDT, a good n‐type semiconductor. The electron‐deficient end group TCNBT dramatically decreased the energy of the highest occupied and lowest unoccupied molecular orbitals (HOMO/LUMO) compared to the fluorinated analogue and improved the molecular orientation when utilized in n‐type organic field‐effect transistors (OFETs). Solution‐processed OFETs based on TCNBT IDT exhibited a charge‐carrier mobility of up to μe≈0.15 cm2 V−1 s−1 with excellent ambient stability for 100 hours, highlighting the benefits of the cyanated end group and the synthetic approach.
Heeney M, Kafourou P, Park B, et al., 2021, One-step six-fold cyanation of benzothiadiazole acceptor Units for air-stable high-performance n-type organic field-effect transistors, Angewandte Chemie International Edition, Vol: 60, Pages: 5970-5977, ISSN: 1433-7851
We report a new high electron affinity acceptor end group for organic semiconductors, 2,1,3-benzothiadiazole-4,5,6-tricarbonitrile (TCNBT). An n-type organic semiconductor with an indacenodithiophene (IDT) core and TCNBT end groups was synthesized by a six-fold nucleophilic substitution with cyanides on a fluorinated precursor, itself prepared by a direct arylation approach. This one-step chemical modification was found to significantly impact the molecular properties: the fluorinated precursor, TFBT IDT, a poor ambipolar semiconductor, was converted into TCNBT IDT, a good n-type semiconductor. The highly electron-deficient end group TCNBT dramatically decreased the energy of the highest occupied and lowest unoccupied molecular orbitals (HOMO/LUMO) compared to the fluorinated analogue and improved the molecular orientation when utilized in n-type organic field-effect transistors (OFETs). Solution-processed OFETs based on TCNBT IDT exhibited a charge carrier mobility of up to µ e ≈ 0.15 cm 2 V -1 s -1 with excellent ambient stability for 100 hours, highlighting the benefits of the cyanated end group and the synthetic approach.
Wang B, Scaccabarozzi AD, Wang H, et al., 2021, Molecular doping of near-infrared organic photodetectors for photoplethysmogram sensors, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 9, Pages: 3129-3135, ISSN: 2050-7526
Hodsden T, Thorley KJ, Basu A, et al., 2021, The influence of alkyl group regiochemistry and backbone fluorination on the packing and transistor performance of N-cyanoimine functionalised indacenodithiophenes, Materials Advances, Vol: 2, Pages: 1706-1714
The synthesis of two novel n-type molecular organic semiconductors based on a fluorinated indacenodithiophene core in combination with an electron withdrawing N-cyanoimine group is reported, and the influence of the regiochemistry of the solubilizing sidechain is investigated. The N-cyanoimine is confirmed to be a strongly electron accepting group, which in combination with the core fluorination resulted in high electron affinities for both materials. Single crystal analysis demonstrated that whilst both materials arrange in ordered slipped stacks with close π–π stacking distances (∼3.40 Å), significant differences in electron transfer integrals for the two regioisomers were observed, relating to differences in relative molecular displacement along the π-stacking direction. Organic thin-film transistors fabricated via blade-coating displayed electron mobility up to 0.13 cm2 V−1 s−1 for the isomer with the larger transfer integral.
Tang M-C, Dang HX, Lee S, et al., 2021, Wide and Tunable Bandgap MAPbBr(3-x)Cl(x) Hybrid Perovskites with Enhanced Phase Stability: In Situ Investigation and Photovoltaic Devices, SOLAR RRL, Vol: 5, ISSN: 2367-198X
Isikgor FH, Subbiah AS, Eswaran MK, et al., 2021, Scaling-up perovskite solar cells on hydrophobic surfaces, NANO ENERGY, Vol: 81, ISSN: 2211-2855
Tang M-C, Zhang S, Magnanelli TJ, et al., 2021, Unraveling the compositional heterogeneity and carrier dynamics of alkali cation doped 3D/2D perovskites with improved stability, MATERIALS ADVANCES, Vol: 2
Maria IP, Paulsen BD, Savva A, et al., 2021, The Effect of Alkyl Spacers on the Mixed Ionic-Electronic Conduction Properties of N-Type Polymers, ADVANCED FUNCTIONAL MATERIALS, Vol: 31, ISSN: 1616-301X
Li Q, Cao Z, Wahyudi W, et al., 2021, Unraveling the New Role of an Ethylene Carbonate Solvation Shell in Rechargeable Metal Ion Batteries, ACS ENERGY LETTERS, Vol: 6, Pages: 69-78, ISSN: 2380-8195
Abdullah I, Emyr Macdonald J, Lin Y-H, et al., 2021, Bias stability of solution-processed In2O3 thin film transistors, JOURNAL OF PHYSICS-MATERIALS, Vol: 4
Liu J, Ye G, Potgieser HGO, et al., 2021, Amphipathic Side Chain of a Conjugated Polymer Optimizes Dopant Location toward Efficient N-Type Organic Thermoelectrics, ADVANCED MATERIALS, Vol: 33, ISSN: 0935-9648
Gedda M, Yengel E, Faber H, et al., 2020, Ruddlesden-Popper-Phase Hybrid Halide Perovskite/Small-Molecule Organic Blend Memory Transistors, ADVANCED MATERIALS, Vol: 33, ISSN: 0935-9648
Firdaus Y, Ho CHY, Lin Y, et al., 2020, Efficient Double- and Triple-Junction Nonfullerene Organic Photovoltaics and Design Guidelines for Optimal Cell Performance, ACS ENERGY LETTERS, Vol: 5, Pages: 3692-3701, ISSN: 2380-8195
Lin Y, Nugraha MI, Firdaus Y, et al., 2020, A Simple n-Dopant Derived from Diquat Boosts the Efficiency of Organic Solar Cells to 18.3%, ACS ENERGY LETTERS, Vol: 5, Pages: 3663-3671, ISSN: 2380-8195
Fan Q, An Q, Lin Y, et al., 2020, Over 14% efficiency all-polymer solar cells enabled by a low bandgap polymer acceptor with low energy loss and efficient charge separation, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 13, Pages: 5017-5027, ISSN: 1754-5692
Basu A, Niazi MR, Scaccabarozzi AD, et al., 2020, Impact of p-type doping on charge transport in blade-coated small-molecule:polymer blend transistors, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 8, Pages: 15368-15376, ISSN: 2050-7526
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