Publications
639 results found
Savva A, Hama A, Herrera-López G, et al., 2022, Photo-Electrochemical Stimulation of Neurons with Organic Donor-Acceptor Heterojunctions
<jats:title>Abstract</jats:title><jats:p>Recent advancements in light-responsive materials enabled the development of devices to artificially activate tissue with light, and show great potential for use in different types of therapy. Photo-stimulation based on organic semiconductors has recently attracted interest due to their unique set of properties such as biocompatibility, better mechanical match with human tissue, and strong absorption of light in the visible spectrum. Here we show the development of solution processed organic heterojunctions that are able to control the activity of primary neurons <jats:italic>in vitro</jats:italic> with light. The p-type polymer semiconductor PDCBT and the n-type polymer semiconductor ITIC (also known as non-fullerene acceptor) are simply spin coated on glass substrates forming a bilayer p-n junction with high photo-sensitivity in aqueous electrolytes. Photo-electrochemical measurements reveal that high photo-voltage and photo-current is produced, as a result of a charge transfer between the polymers and oxygen in the electrolyte. The biocompatibility of the proposed materials is addressed with live/dead assays on both primary mouse cortical neurons and human cell lines that are cultured on their surface. We have found that light of low intensity (i.e. 40 mW/cm<jats:sup>2</jats:sup>) is absorbed, and converted into a cue that triggers action potential on primary cortical neurons directly cultured on glass/PDCBT/ITIC interfaces as proven by patch clamp measurements. The activation of neurons is most likely due to photochemical reactions at the polymer/electrolyte interface that result in hydrogen peroxide, which might lead to modulation of specific ion channels on neurons membrane. Photo-thermal effects are excluded with controlled patch clamp measurements on neurons cultured on plain glass and on photoresist thin films. The profound advantages of low intensity light stimulation, simpl
Alsufyani M, Stoeckel M-A, Chen X, et al., 2022, Lactone Backbone Density in Rigid Electron-Deficient Semiconducting Polymers Enabling High n-type Organic Thermoelectric Performance, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 61, ISSN: 1433-7851
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- Citations: 22
Abdel Aziz I, Gladisch J, Moser M, et al., 2022, Fundamentals of electrochemical doping in polythiophene polymers, nanoGe Spring Meeting 2022, Publisher: Fundació Scito
Surgailis J, Druet V, Griggs S, et al., 2022, Understanding the effect of polymer hydration on n-type organic mixed semiconductor transistors, Organic Bioelectronics Conference 2022, Publisher: Fundació Scito
Kim Y, Kim G, Ding B, et al., 2022, High-current-density organic electrochemical diodes enabled by asymmetric active layer design, Advanced Materials, ISSN: 0935-9648
Owing to their outstanding electrical/electrochemical performance, operational stability, mechanical flexibility, and decent biocompatibility, organic mixed ionic–electronic conductors have shown great potential as implantable electrodes for neural recording/stimulation and as active channels for signal switching/amplifying transistors. Nonetheless, no studies exist on a general design rule for high-performance electrochemical diodes, which are essential for highly functional circuit architectures. In this work, generalizable electrochemical diodes with a very high current density over 30 kA cm−2 are designed by introducing an asymmetric active layer based on organic mixed ionic–electronic conductors. The underlying mechanism on polarity-sensitive balanced ionic doping/dedoping is elucidated by numerical device analysis and in operando spectroelectrochemical potential mapping, while the general material requirements for electrochemical diode operation are deduced using various types of conjugated polymers. In parallel, analog signal rectification and digital logic processing circuits are successfully demonstrated to show the broad impact of circuits incorporating organic electrochemical diodes. It is expected that organic electrochemical diodes will play vital roles in realizing multifunctional soft bioelectronic circuitry in combination with organic electrochemical transistors.
Yu D, Wang Y, Chen J, et al., 2022, Co-delivery of NIR-II semiconducting polymer and pH-sensitive doxorubicin-conjugated prodrug for photothermal/chemotherapy, ACTA BIOMATERIALIA, Vol: 137, Pages: 238-251, ISSN: 1742-7061
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- Citations: 13
Alsaggaf S, Ashraf RS, Purushothaman B, et al., 2021, Efficiency Limits in Wide-Bandgap Ge-Containing Donor Polymer:Nonfullerene Acceptor Bulk Heterojunction Solar Cells, PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS, Vol: 15, ISSN: 1862-6254
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- Citations: 2
Krauhausen I, Koutsouras DA, Melianas A, et al., 2021, Organic neuromorphic electronics for sensorimotor integration and learning in robotics, SCIENCE ADVANCES, Vol: 7, ISSN: 2375-2548
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- Citations: 40
Kosco J, Gonzalez-Carrero S, Howells CT, et al., 2021, Oligoethylene glycol side chains increase charge generation in organic semiconductor nanoparticles for enhanced photocatalytic hydrogen evolution, Advanced Materials, Vol: 34, Pages: 1-9, ISSN: 0935-9648
Organic semiconductor nanoparticles (NPs) composed of an electron donor/acceptor (D/A) semiconductor blend have recently emerged as an efficient class of hydrogen-evolution photocatalysts. It is demonstrated that using conjugated polymers functionalized with (oligo)ethylene glycol side chains in NP photocatalysts can greatly enhance their H2-evolution efficiency compared to their nonglycolated analogues. The strategy is broadly applicable to a range of structurally diverse conjugated polymers. Transient spectroscopic studies show that glycolation facilitates charge generation even in the absence of a D/A heterojunction, and further suppresses both geminate and nongeminate charge recombination in D/A NPs. This results in a high yield of photogenerated charges with lifetimes long enough to efficiently drive ascorbic acid oxidation, which is correlated with greatly enhanced H2-evolution rates in the glycolated NPs. Glycolation increases the relative permittivity of the semiconductors and facilitates water uptake. Together, these effects may increase the high-frequency relative permittivity inside the NPs sufficiently, to cause the observed suppression of exciton and charge recombination responsible for the high photocatalytic activities of the glycolated NPs.
Guo Y, Yang X, Wang L, et al., 2021, Aldol Polymerization to Construct Half-Fused Semiconducting Polymers, MACROMOLECULES, Vol: 54, Pages: 10312-10320, ISSN: 0024-9297
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- Citations: 10
Ma C, Chen H, Yengel E, et al., 2021, Printed Memtransistor Utilizing a Hybrid Perovskite/Organic Heterojunction Channel, ACS APPLIED MATERIALS & INTERFACES, Vol: 13, Pages: 51592-51601, ISSN: 1944-8244
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- Citations: 6
Quill TJ, LeCroy G, Melianas A, et al., 2021, Ion Pair Uptake in Ion Gel Devices Based on Organic Mixed Ionic-Electronic Conductors, ADVANCED FUNCTIONAL MATERIALS, Vol: 31, ISSN: 1616-301X
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- Citations: 25
Markina A, Lin K, Liu W, et al., 2021, Chemical Design Rules for Non‐Fullerene Acceptors in Organic Solar Cells (Adv. Energy Mater. 44/2021), Advanced Energy Materials, Vol: 11, ISSN: 1614-6832
Markina A, Lin K-H, Liu W, et al., 2021, Chemical Design Rules for Non-Fullerene Acceptors in Organic Solar Cells, ADVANCED ENERGY MATERIALS, Vol: 11, ISSN: 1614-6832
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- Citations: 31
Cendra C, Balhorn L, Zhang W, et al., 2021, Unraveling the Unconventional Order of a High-Mobility Indacenodithiophene-Benzothiadiazole Copolymer, ACS MACRO LETTERS, Vol: 10, Pages: 1306-1314
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- Citations: 11
Torricelli F, Adrahtas DZ, Bao Z, et al., 2021, Electrolyte-gated transistors for enhanced performance bioelectronics, NATURE REVIEWS METHODS PRIMERS, Vol: 1
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- Citations: 114
Ponder JF, Chen H, Luci AMT, et al., 2021, Low-Defect, High Molecular Weight Indacenodithiophene (IDT) Polymers Via a C-H Activation: Evaluation of a Simpler and Greener Approach to Organic Electronic Materials, ACS MATERIALS LETTERS, Vol: 3, Pages: 1503-1512
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- Citations: 9
Zheng Y, Yu Z, Zhang S, et al., 2021, A molecular design approach towards elastic and multifunctional polymer electronics, NATURE COMMUNICATIONS, Vol: 12
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- Citations: 47
Tan STM, Keene S, Giovannitti A, et al., 2021, Operation mechanism of organic electrochemical transistors as redox chemical transducers, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 9, Pages: 12148-12158, ISSN: 2050-7526
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- Citations: 13
Huang Y, Lukito Tjhe DH, Jacobs IE, et al., 2021, Design of experiment optimization of aligned polymer thermoelectrics doped by ion-exchange, APPLIED PHYSICS LETTERS, Vol: 119, ISSN: 0003-6951
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- Citations: 8
Krauhausen I, Gkoupidenis P, Melianas A, et al., 2021, Local sensorimotor control and learning in robotics with organic neuromorphic electronics, Neural Interfaces and Artificial Senses, Publisher: Fundació Scito
Iqbal HF, Waldrip M, Chen H, et al., 2021, Elucidating the Role of Water-Related Traps in the Operation of Polymer Field-Effect Transistors, ADVANCED ELECTRONIC MATERIALS, Vol: 7, ISSN: 2199-160X
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- Citations: 9
Rashid RB, Du W, Griggs S, et al., 2021, Ambipolar inverters based on cofacial vertical organic electrochemical transistor pairs for biosignal amplification, SCIENCE ADVANCES, Vol: 7, ISSN: 2375-2548
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- Citations: 35
Hallani RK, Paulsen BD, Petty AJ, et al., 2021, Regiochemistry-Driven Organic Electrochemical Transistor Performance Enhancement in Ethylene Glycol-Functionalized Polythiophenes, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 143, Pages: 11007-11018, ISSN: 0002-7863
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- Citations: 56
Clarke AJ, Luke J, Meitzner R, et al., 2021, Non-fullerene acceptor photostability and its impact on organic solar cell lifetime, CELL REPORTS PHYSICAL SCIENCE, Vol: 2
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- Citations: 28
Griggs S, Marks A, Bristow H, et al., 2021, n-Type organic semiconducting polymers: stability limitations, design considerations and applications, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 9, Pages: 8099-8128, ISSN: 2050-7526
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- Citations: 82
Guo K, Wustoni S, Koklu A, et al., 2021, Rapid single-molecule detection of COVID-19 and MERS antigens via nanobody-functionalized organic electrochemical transistors, NATURE BIOMEDICAL ENGINEERING, Vol: 5, Pages: 666-677, ISSN: 2157-846X
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- Citations: 164
Khan J, Alamoudi MA, Chaturvedi N, et al., 2021, Impact of Acceptor Quadrupole Moment on Charge Generation and Recombination in Blends of IDT-Based Non-Fullerene Acceptors with PCE10 as Donor Polymer, ADVANCED ENERGY MATERIALS, Vol: 11, ISSN: 1614-6832
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- Citations: 23
Khan JI, Alamoudi MA, Chaturvedi N, et al., 2021, Organic Solar Cells: Impact of Acceptor Quadrupole Moment on Charge Generation and Recombination in Blends of IDT‐Based Non‐Fullerene Acceptors with PCE10 as Donor Polymer (Adv. Energy Mater. 28/2021), Advanced Energy Materials, Vol: 11, ISSN: 1614-6832
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.
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