Slip‐Stacked J‐Aggregate Materials for Organic Solar Cells and Photodetectors

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(22)

Published: Oct. 19, 2021

Abstract Dye–dye interactions affect the optical and electronic properties in organic semiconductor films of light harvesting detecting optoelectronic applications. This review elaborates how to tailor these semiconductors for solar cells (OSCs) photodiodes (OPDs). While devices rely on similar materials, demands their are rather different, former requiring a broad absorption spectrum spanning from UV over visible up near‐infrared region latter an ultra‐narrow at specific, targeted wavelength. In order design satisfying demands, fundamental insights relationship provided depending molecular packing arrangement resultant coupling thereof. Based recent advancements theoretical understanding intermolecular between slip‐stacked dyes, distinguishing classical J‐aggregates with predominant long‐range Coulomb charge transfer (CT)‐mediated or ‐coupled J‐aggregates, whose red‐shifts primarily governed by short‐range orbital interactions, is suggested. Within this framework, aggregate structure functional representative classes dye aggregates analyzed most advanced OSCs wavelength‐selective OPDs, providing important into rational thin‐film materials.

Language: Английский

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Narrowband organic photodetectors – towards miniaturized, spectroscopic sensing

Materials Horizons, Journal Year: 2021, Volume and Issue: 9(1), P. 220 - 251

Published: Oct. 27, 2021

Organic photodetectors can achieve narrowband photodetection within a single optoelectronic device. This comprehensive review summarizes and compares the different approaches, introduces their application fields, outlines current challenges.

Language: Английский

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An All‐Organic Self‐Powered Photodetector with Ultraflexible Dual‐Polarity Output for Biosignal Detection

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(30)

Published: June 2, 2022

Endowing photodetectors with mechanically flexibility and actual functionality are current research issues in developing optoelectronic devices. However, rigid metal-based or metal-oxide-based electrodes remain a block to the realization of ultraflexible electronics. Thus, an all-organic photodetector (all-OPD) is designed by innovatively introducing symmetrical organic PH1000/PH1000 substitute widely applied indium-doped tin oxide (ITO)/Ag electrodes. Specifically, this all-OPD exhibits high self-powered responsivity (R) over 100 mA W-1 among 500-600 nm photocurrent remains about 80% original performance after being bent 20 000 circles, can output steady biosignals for photo-plethysmography (PPG) application. More importantly, outputs dual-polarity as it flipped folded. Benefitting from ordered phase distribution Schottky barrier heights, photogenerated holes will be transferred collected nearer electrode, while electrons trapped thick bulk heterojunction (BHJ) result long channel. This work offers new avenue toward multifunctional straightforward all-solution method, expected more compatible complex application scenarios.

Language: Английский

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An Efficient Narrowband Near‐Infrared at 1040 nm Organic Photodetector Realized by Intermolecular Charge Transfer Mediated Coupling Based on a Squaraine Dye

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(26)

Published: May 31, 2021

A highly sensitive short-wave infrared (SWIR, λ > 1000 nm) organic photodiode (OPD) is described based on a well-organized nanocrystalline bulk-heterojunction (BHJ) active layer composed of dicyanovinyl-functionalized squaraine dye (SQ-H) donor material in combination with PC

Language: Английский

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Doping Compensation Enables High‐Detectivity Infrared Organic Photodiodes for Image Sensing

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(29)

Published: May 13, 2022

Abstract Infrared organic photodiodes have gained increasing attention due to their great application potentials in night vision, optical communication, and all‐weather imaging. However, the commonly occurring high dark current low detectivity impede infrared photodetectors from portable applications at room temperature. Herein, an efficient generic doping compensation strategy is developed improve of photodiodes. A series n‐type semiconductors investigated, it found that not only reduces trap density states currents, but also restrains nonradiative recombination with improved charge transport collection. As a result, ultralow noise spectral 8 × 10 −15 Hz −1/2 as well specific over 13 Jones 780–1070 nm achieved More importantly, high‐performance can be successfully applied high‐pixel‐density image arrays without patterning sensing layers. These findings provide important design insights will crucial further performance future.

Language: Английский

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The Design and Bioimaging Applications of NIR Fluorescent Organic Dyes with High Brightness

Advanced Optical Materials, Journal Year: 2022, Volume and Issue: 10(8)

Published: Feb. 22, 2022

Abstract Due to the merits of decreased photon attenuation, autofluorescence, and scattering, near‐infrared (NIR, 700–1700 nm) region is an important window in field biomedicine, such as vivo fluorescence imaging, which both optical detection depth resolution/contrast have been significantly improved. In particular, for second NIR (NIR‐II, 1000–1700 dyes, biological tissues almost no background interference. Typical fluorophores excellent spectral performance rich functional modification sites can be optimized into dyes bioimaging. However, absorption/emission wavelength redshift NIR, it challenging keep with satisfying brightness. Therefore, purpose increasing dye while promoting its brightness, necessary study structure–property relationship dyes. This review introduces influences fluorophores’ structure on their photophysical properties, summarizes strategies maintaining high brightness along redshifted wavelengths, latest advances highly fluorescent Finally, opportunities challenges this emerging are also provided. The authors aim provide insightful design guidelines clear overview bright might trigger new ideas applications.

Language: Английский

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Flexible and Stretchable Light-Emitting Diodes and Photodetectors for Human-Centric Optoelectronics

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(3), P. 768 - 859

Published: Jan. 19, 2024

Optoelectronic devices with unconventional form factors, such as flexible and stretchable light-emitting or photoresponsive devices, are core elements for the next-generation human-centric optoelectronics. For instance, these deformable can be utilized closely fitted wearable sensors to acquire precise biosignals that subsequently uploaded cloud immediate examination diagnosis, also used vision systems human-interactive robotics. Their inception was propelled by breakthroughs in novel optoelectronic material technologies device blueprinting methodologies, endowing flexibility mechanical resilience conventional rigid devices. This paper reviews advancements soft technologies, honing on various materials, manufacturing techniques, design strategies. We will first highlight general approaches fabrication, including appropriate selection substrate, electrodes, insulation layers. then focus materials diodes, their integration strategies, representative application examples. Next, we move photodetectors, highlighting state-of-the-art fabrication methods, followed At end, a brief summary given, potential challenges further development of functional discussed conclusion.

Language: Английский

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Bidirectional and Dual‐Mode Organic Photodetector Enables Secure Ultraviolet Communication

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(31)

Published: April 20, 2023

Abstract Traditional optical communication mode with single‐band photodetector depicts terrible confidentiality and it depends on sophisticated cryptography schemes to obtain a secure process. Dual‐band photodetectors have potential realize straightforward encryption strategy. However, previous reports of dual‐band organic (OPD) relied the multi‐stacked photosensitive layers thus there remain challenges in spectral matching interfaces contacting. Here, structurally simple bidirectional UV–vis OPD is proposed, single layer sitting between electrodes. By elaborately regulating field distribution vertical phase segregation bulk heterojunction (BHJ), this presents completely distinct response ranges under illuminations. Finally, outputs outstanding self‐powered UV vis responsivities (up 30 50 mA W −1 ) as light illuminates from forward backward direction, respectively. In addition, stable reliable system realized based where conveys valid information further superimposes for encryption. This design concept offers alternative achieving varied windows opens up novel method, which has be applied close‐range private

Language: Английский

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An n‐Type All‐Fused‐Ring Molecule with Photoresponse to 1000 nm for Highly Sensitive Near‐Infrared Photodetector

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(20)

Published: Feb. 26, 2023

Abstract Most of all‐fused‐ring π‐conjugated molecules have wide or medium bandgap and show photo response in the visible range. In this work, an n‐type molecule, which exhibits ultrasmall optical 1.22 eV strong near‐infrared (NIR) absorption with onset wavelength 1013 nm is reported. The molecule consists 14 aromatic rings has electron donor–acceptor characteristics. It excellent properties low‐lying HOMO/LUMO energy levels −5.48 eV/−3.95 high mobility 7.0 × 10 −4 cm 2 V −1 s . importantly, its thin film a low trap density 5.55 16 −3 because fixed molecular conformation consequently disorder. As result, organic photodetector (OPD) based on compound remarkably dark current ( J d ) 2.01 −10 A −2 at 0 V. device shows shot‐noise‐limited specific detectivity D sh *) exceeding 13 Jones 400–1000 region peak 4.65 880 nm. This performance among best reported for self‐powered NIR OPDs.

Language: Английский

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Interfacial Engineering for Photomultiplication Type Organic Photodetectors with Signal‐Noise‐Ratio Over 89 000

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(16)

Published: Jan. 28, 2024

Abstract Photomultiplication type organic photodetectors (PM‐OPDs) exhibit obvious superiority in weak light detection due to their low dark current density ( J D ) and large photo‐induced PI ). The is one of the important parameters that influences sensitivity PM‐OPDs, how effectively suppress a great challenge improve performance PM‐OPDs. In this work, PM‐OPDs can be suppressed by employing PTAA or doped‐PTAA as interfacial layer replacing PEDOT:PSS layer. with 2.3 × 10 −7 A cm −2 under −6 V bias, which much smaller than 1.4 for small molecule DRCN5T incorporated into further passivate surficial defects films, conducive reducing leakage optimal rather 8.4 −8 well external quantum efficiency (EQE) 31700% specific detectivity (D*) 1.2 13 Jones at 370 nm. signal‐noise‐ratio arrives 89600 −4.5 bias white illumination intensity 1.5 mW .

Language: Английский

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