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P‐type Sb‐doped Cu <sub/>2</sub> O Hole Injection Layer Integrated on Transparent ITO Electrode for Acidic PEDOT:PSS‐Free Quantum Dot Light Emitting Diodes
摘要： It is developed that transparent p-type Sb-doped cuprous oxide (ACO) integrated Sn-doped In2O3 (ITO) film as hole injection layer (HIL) and anode combined electrodes for quantum dot light emitting diodes (QD-LEDs) to substitute acidic PEDOT:PSS HIL based electrode. By graded co-sputtering of ACO and ITO targets, the graded p-type ACO buffer layer can be integrated on the surface region of the ITO electrodes. P-type conductivity of the ACO film for acting as effective HIL in QD-LEDs is confirmed by a positive Hall coefficient (1.74 (cid:1) 10 (cid:3)1). Due to the well-matched work function of p-type ACO on the ITO electrodes, the acidic PEDOT:PSS-free QD-LEDs exhibited typical current-voltage-luminescence of QD-LEDs. The successful operation of PEDOT:PSS-free QD-LED with p-type ACO integrated ITO electrode indicates that ACO and ITO anode graded sputtering is simpler fabrication steps for cost-effective QD-LEDs and elimination of interfacial reactions caused by the acidic PEDOT:PSS layer for reliable QD-LEDs.
关键词： Sn-doped In2O3,acidic PEDOT:PSS,hole injection layer,p-type conductivity,Sb-doped Cu2O,quantum dots light emitting diodes
更新于2025-11-21 10:59:37
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Electrolyte effects on formation and properties of PEDOT-graphene oxide composites
摘要： This work presents a comparative electrochemical and spectroelectrochemical study of composites consisting of poly(3,4-ethylenedioxythiophene) (PEDOT) and graphene oxide (GO) synthesized in different electrolyte solutions. The electrochemical behavior of PEDOT/GO composites were studied in an ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate) as well as in conventional organic (acetonitrile) and aqueous electrolytes by cyclic voltammetry and electrochemical impedance spectroscopy. Additionally, we applied in situ Attenuated Total Reflection Fourier Transformed Infrared (ATR–FTIR) spectroelectrochemistry using a Kretschmann geometry cell to study the composite fabrication during potentiodynamic electropolymerization, and to study the electronic properties and charge carrier formation during p-doping. According to in situ ATR-FTIR analysis, the doping induced bands from charge carrier formation begin to grow at lower potentials for the composite film and the electronic absorptions indicate formation of only one type of charge carrier in the composite made and characterized in ionic liquid. The optical properties during doping were determined by in situ UV–Vis spectroelectrochemistry. The composite film fabricated in water has its absorbance maximum at slightly higher wavelengths, and the appearance of the film is changed from well-known light blue color of PEDOT to greyish.
关键词： spectroelectrochemistry,PEDOT,composite,graphene oxide,electrolyte
更新于2025-11-19 16:56:35
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Determination of the Thin-Film Structure of Zwitterion-Doped Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate): A Neutron Reflectivity Study
摘要： Doping poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is known to improve its conductivity, however little is known about the thin film structure of PEDOT:PSS when doped with an asymmetrically charged dopant. In this study, PEDOT:PSS was doped with different concentrations of the zwitterion 3-(N,N Dimethylmyristylammonio)propanesulfonate (DYMAP), and its effect on the bulk structure of the films characterized by neutron reflectivity. The results show that at low doping concentration, the film separates into a quasi bi-layer structure with lower roughness (10%), increased thickness (18%), and lower electrical conductivity compared to the un-doped sample. However when the doping concentration increases the film forms into a homogeneous layer and experiences an enhanced conductivity by more than an order of magnitude, a 20% smoother surface, and a 60% thickness increase relative to the pristine sample. Atomic force microscopy and profilometry measurements confirmed these findings, and AFM height and phase images showed the gradually increasing presence of DYMAP on the film surface as a function of the concentration. Neutron reflectivity also showed that the quasi bi-layer structure of the lowest concentration doped PEDOT:PSS is separated by a graded rather than a well defined interface. Our findings provide an understanding of the layer structure modification for doped PEDOT:PSS films that should be prove important for device applications.
关键词： neutron reflectivity,hole transporting layer,conductivity,film structure,zwitterion,PEDOT:PSS
更新于2025-11-14 15:19:41
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AIP Conference Proceedings [Author(s) THE 3RD INTERNATIONAL CONFERENCE ON OPTOELECTRONIC AND NANO MATERIALS FOR ADVANCED TECHNOLOGY (icONMAT 2019) - Kerala, India (3–5 January 2019)] - Effect of substrate temperature on spray coated PEDOT:PSS thin film morphology for organic solar cell
摘要： The effect of substrate temperature on the spray coated poly (3,4-ethylenedioxythiophene): poly (styrenesulfonic acid) (PEDOT: PSS) hole transport layer (HTL) is explored in terms of morphological, electrical and photovoltaic characterization. The substrate temperature is varied in three steps 100, 150 and 200°C during the spray deposition of PEDOT: PSS thin film layer. Scanning electron microscopy (SEM) and optical microscopy images reveal that for the substrate temperatures of 100°C and 150°C, the morphology of PEDOT: PSS layer is improved and further increasing the temperature to 200°C, voids and cracks are formed in the films. These voids and cracks influence the conductivity of PEDOT: PSS layer which reduces from 4.7 for 150°C to 3.9 S/cm for 200°C. Organic solar cells (OSCs) using PTB7:PC71BM absorber layer on the spray coated PEDOT:PSS HTL show an efficiency increase from 2.34 for 100°C to 2.88% for 150°C and then decrease to 1.88% for 200°C.
关键词： substrate temperature,spray coating,PEDOT:PSS,morphology,organic solar cells
更新于2025-10-22 19:40:53
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Rectify Effect of Pedot:PSS/WS <sub/>2</sub> Heterostructure
摘要： Recently, devices based on organic and two-dimensional (2D) materials have been recognized as the easiest way to fabricate hybrid 2D van der Waals (vdW) heterojunction devices for electronic and optoelectronic applications. Depositing organic materials on 2D materials is typically demonstrated by thermal evaporation using high voltage and vacuum systems. In this paper, a simple way to fabricate organic/n-2D heterostructures, where Pedot:PSS is chosen to be the organic material due to its high conductivity, excellent film forming ability and good stability, while WS2 is selected as the n-2D material due to its well-known properties has been presented. By systematically studying the gate dependent and temperature-dependent I–V characteristics of the Pedot:PSS/WS2 heterojunctions, it is demonstrated that the device shows a diode-like behavior with rectification ratio (RF) of (cid:1)5 and a turn on voltage of (cid:1)2 V at room temperature (RT). Furthermore, the rectification ratio of the junction reaches up to 103 using a back-gate bias voltage (Vgs) of 20 V together with drain–source voltage (Vds) ranging from (cid:3)4 to 4 V. On the basis of the results, it is demonstrated that this simple technique of fabricating organic/2D vdW heterojunctions can extend to other organics and 2D materials.
关键词： 2-D heterjunction,Pedot:PSS,WS2
更新于2025-09-23 15:23:52
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Free-standing highly conducting PEDOT films for flexible thermoelectric generator
摘要： Recently, organic thermoelectric (TE) materials especially conducting polymers have attracted increasing attention. In this work, we successfully synthesized ultrafine poly (3,4-ethylenedioxythiophene) (PEDOT) nanowires (NWs) (~10 nm) by a simple self-assembled micellar soft-template method and then obtain highly flexible free-standing PEDOT NW films by vacuum-assisted filtration. The films are with very high electrical conductivity (~1340 S cm?1). After being treated with 6 M H?SO? and then with 1 M NaOH at room temperature, the film shows an enhanced power factor of 46.51 μW m?1 K?2 (Seebeck coefficient of 25.5 μV K?1, electrical conductivity of 715.3 S cm?1), which increases by 54% compared with that of the pristine film. To the best of our knowledge, it outperforms the TE performance of all reported one-dimensional conducting polymer-based films. In addition, the TE performance of the film almost remains unchanged even after being bent for 200 times, indicating excellent flexibility. A flexible TE prototype composed of six strips (7 mm × 30 mm) of the as-prepared PEDOT NW films connected in series shows an output power of 157.2 nW at a temperature difference of 51.6 K. The free-standing PEDOT NW films show promise to a new generation of wearable TE devices.
关键词： Flexible,Thermoelectric,Free-standing,PEDOT,Highly conductive
更新于2025-09-23 15:23:52
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Flexible all-organic photorefractive devices
摘要： The objective of the present study is to demonstrate and evaluate the photorefractive (PR) performance of an all-organic PR device with a self-assembled monolayer (SAM)-modified organic conductive electrode of PEDOT:PSS coated on polyethylene terephthalate (PET). The PR composite consisted of a triphenylamine-based photoconductive polymer: poly(4-(diphenylamino)benzylacrylate) (PDAA), triphenylamine photoconductive plasticizer: (4-(diphenylamino)phenyl)methanol (TPAOH), nonlinear optical dye based on aminocyanostyrene: (4-asacycloheptylbenzylidenemalononitrile) (7-DCST), and soluble fullerene: [6, 6]-phenyl C61 butyric acid-methyl ester (PCBM). For comparison with the all-organic PR device, the PR performances using PET/ITO, glass/ITO, and glass/PEDOT:PSS substrates were also evaluated. The PR performance at an applied electric field of 40 V μm-1: diffraction efficiency and the response time of the PR device using PET/PEDOT:PSS-SAM substrate were 21.9%, and 390 ms, respectively. As a result of repeating bending test on this all-organic PR device, we found that the flexible PR device with PET/PEDOT:PSS-SAM substrate had a potential to withstand bending 10,000 times and revealed that the change in the haze value strongly influenced the degradation of PR performance.
关键词： All-organic,Photorefractive polymer,ITO-free device,PET substrate,PEDOT:PSS,Flexible
更新于2025-09-23 15:23:52
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Improvement of resistive memory properties of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/CH3NH3PbI3 based device by potassium iodide additives
摘要： In this study, a glass/indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)/CH3NH3PbI3 (MAPbI3)/poly(methyl methacrylate) (PMMA)/Al nonvolatile memory device is demonstrated. The MAPbI3 film is prepared on top of the PEDOT:PSS by a two-step process, showing a bipolar resistive switching character. Because PEDOT:PSS is widely used as a hole transporting layer for a planar heterojunction perovskite solar cell, the demonstrated memory property of PEDOT:PSS/MAPbI3 combination opens up the application potential for multifunctional optoelectronic memory. The device is improved by introducing potassium iodide (KI) as an additive to ameliorate the quality of MAPbI3 material and PEDOT:PSS/MAPbI3 interface. As compared with the pristine MAPbI3, the KI-doped perovskite device exhibits a resistive switching ON/OFF ratio of 103, better endurance and more stable retention. The KI additive is helpful for forming uniform crystalline grain, high-compact structure and passivation of defect states for MAPbI3 film and interface, which are the main reasons to the improved memory properties. Finally, we suggest that KI has great potential to be used as an additive for constructing a high performance perovskite memory device.
关键词： CH3NH3PbI3,Resistive random access memory,PEDOT:PSS,KI additive
更新于2025-09-23 15:23:52
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Inkjet Printed hybrid light sensors based on Titanium Dioxide and PEDOT:PSS
摘要： We demonstrate photodetectors sensitive to ultraviolet light entirely developed by means of inkjet printing technique and based on titanium dioxide and PEDOT:PSS. Devices have a lateral architecture and are realized on a plastic substrate, thanks to the low thermal budget production process. Pure titania devices behave as standard photodetectors, increasing their conductivity by more than 4 orders of magnitude upon UV light exposure. Bilayers of PEDOT:PSS and titania show an inverted behavior, with a high conductivity in the dark which drops by 7 orders of magnitude upon light exposure: this is likely due to the fast recombination of PEDOT:PSS holes with photogenerated TiO2 electrons. The series connection of pure TiO2 and of PEDOT:PSS/TiO2 bilayer is suggested as the basis for the development of low-power, complementary–like, photosensitive voltage dividers.
关键词： photosensitive voltage divider,inkjet printing,PEDOT:PSS,inverted,UV detector,titanium dioxide,negative photoconductivity,photoresistor
更新于2025-09-23 15:23:52
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Highly conductive, transparent and metal-free electrodes with a PEDOT:PSS/SWNT bilayer for high-performance organic thin film transistors
摘要： Conductive organic materials including polymers, small molecules, and carbon nanotubes (CNTs) are a promising alternative to inorganic materials in electronic devices. Conventionally, organic electrodes employing CNTs are designed using functionalization of their surfaces or formation of nanocomposites with a conductive polymer. However, phase separation limits the concentration of CNTs in a polymer matrix, hindering the formation of highly dense CNT networks and leading to poor electrical conductivity. In this paper, we introduce bilayer electrodes comprising poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and single-walled CNTs (SWNTs) chemically modified by HNO3 treatment. Impressive conductivities of 2432 and 2438 S cm?1 are found for the SWNT/PEDOT:PSS (S/P) and PEDOT:PSS/SWNT (P/S) electrodes, respectively. Further, an increase in the work function of the electrodes after HNO3 treatment lowers the hole injection barrier, which facilitates hole injection from pentacene. The smooth surface of PEDOT:PSS also contributes to growth of large pentacene grains; consequently, the field-effect mobility of pentacene-based thin film transistors is 1.88 cm2 V?1 s?1 when the P/S electrode is employed. The metal-free electrodes also exhibit a high optical transparency of 88.7%, which suggests that they have great potential for applications in optoelectronics.
关键词： Electrode,PEDOT:PSS,Carbon nanotube,Pentacene,Thin film transistor
更新于2025-09-23 15:23:52