Fast Near‐Infrared Photodetectors Based on Nontoxic and Solution‐Processable AgBiS2 DOI Creative Commons
Yi‐Teng Huang, Davide Nodari, Francesco Furlan

et al.

Small, Journal Year: 2023, Volume and Issue: 20(18)

Published: Dec. 8, 2023

Abstract Solution‐processable near‐infrared (NIR) photodetectors are urgently needed for a wide range of next‐generation electronics, including sensors, optical communications and bioimaging. However, it is rare to find with >300 kHz cut‐off frequencies, especially in the NIR region, many emerging inorganic materials explored comprised toxic elements, such as lead. Herein, solution‐processed AgBiS 2 high frequencies under both white light (>1 MHz) (approaching 500 kHz) illumination developed. These due short transit distances charge‐carriers ultrathin photoactive layer photodetectors, which arise from strong absorption this material, that film thicknesses well below 120 nm sufficient absorb >65% visible light. It also revealed ion migration plays critical role photo‐response speed these devices, its detrimental effects can be mitigated by finely tuning thickness layer, important achieving low dark current densities well. outstanding characteristics enable realization air‐stable, real‐time heartbeat sensors based on strongly motivates their future integration high‐throughput systems.

Language: Английский

Recent Progress in π-Conjugated Polymers for Organic Photovoltaics: Solar Cells and Photodetectors DOI
Chunchen Liu, Lin Shao, Shihao Chen

et al.

Progress in Polymer Science, Journal Year: 2023, Volume and Issue: 143, P. 101711 - 101711

Published: June 25, 2023

Language: Английский

Citations

74
Boosting the Performance of Organic Photodetectors with a Solution‐Processed Integration Circuit toward Ubiquitous Health Monitoring DOI
Gan Luo, Jialin Shi, Wei Deng

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(36)

Published: July 15, 2023

Organic photodetectors, as an emerging wearable photoplethysmographic (PPG) technology, offer exciting opportunities for next-generation photonic healthcare electronics. However, the mutual restraints among photoresponse, structure complexity, and fabrication cost have intrinsically limited development of organic photodetectors ubiquitous health monitoring in daily activities. Here, effective route to dramatically boost performance with a solution-processed integration circuit application is reported. Through creating ideal metal-semiconductor junction interface that minimizes trap states within device, solution-printed field-effect transistors (OFETs) are achieved ultrahigh signal amplification efficiency 37.1 S A-1 , approaching theoretical thermionic limit. Consequently, monolithic OFET photoconductor enables remarkable photoresponse signal-to-noise ratio by more than four orders magnitude from 5.5 4.6 × 105 which able meet demand accurately extracting physiological information PPG waveforms. This work offers versatile approach greatly enhance photodetector performance, promising revolutionize technologies.

Language: Английский

Citations

49
Sensitive Organic Photodetectors With Spectral Response up to 1.3 µm Using a Quinoidal Molecular Semiconductor DOI

Bingyan Yin,

Xia Zhou,

Yuyang Li

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(19)

Published: Feb. 15, 2024

Abstract Detecting short‐wavelength infrared (SWIR) light has underpinned several emerging technologies. However, the development of highly sensitive organic photodetectors (OPDs) operating in SWIR region is hindered by their poor external quantum efficiencies (EQEs) and high dark currents. Herein, high‐sensitivity SWIR‐OPDs with an efficient photoelectric response extending up to 1.3 µm reported. These OPDs utilize a new ultralow‐bandgap molecular semiconductor featuring quinoidal tricyclic electron‐deficient central unit multiple non‐covalent conformation locks. The SWIR‐OPD achieves unprecedented EQE 26% under zero bias even more impressive 41% –4 V at 1.10 µm, effectively pushing detection limit silicon photodetectors. Additionally, low energetic disorder trap density active layer lead significant suppression thermal‐generation carriers current, resulting excellent detectivity ( D sh * ) exceeding 10 13 Jones from 0.50 1.21 surpassing 12 1.30 bias, marking highest achievements for beyond date. Validation photoplethysmography measurements, spectrometer prototype 0.35–1.25 range, image capture 1.20 irradiation demonstrate extensive applications this SWIR‐OPD.

Language: Английский

Citations

39
Wavelength‐Selective Near‐Infrared Organic Upconversion Detectors for Miniaturized Light Detection and Visualization DOI
Ning Li, Xin Hu,

Ying Lu

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 23, 2024

Abstract Upconversion detectors monolithically combining a detection unit and light emitting unit, enables visualization in compact structure, promising great advances miniaturized multifunctional optoelectronics. The range of upconversion usually covers broadband spectrum, limiting their use spectroscopic fields. This work investigates two wavelength‐selective made with organic semiconductors to realize narrowband near‐infrared (NIR) dual function. Two non‐fullerene‐based NIR‐sensitive bulk‐heterojunctions (BHJs) are exploited make detectors, achieving peak sensitivity at 860 890 nm, full width half maximum 125 170 respectively. Each BHJ comprises donor polymer non‐fullerene acceptor, both which selectively sensitive NIR light. cumulative analysis the optical properties absorber current–voltage characteristics device indicates that wavelength selectivity stems mainly from wavelength‐dependent absorption. In particular, exhibit electronic dual‐readouts, appealing for applications, including health monitoring, communication, microbead imaging, paving way practical applications.

Language: Английский

Citations

19
Electron-donating amine-interlayer induced n-type doping of polymer:nonfullerene blends for efficient narrowband near-infrared photo-detection DOI Creative Commons
Quan Liu, Stefan Zeiske, Xueshi Jiang

et al.

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Sept. 3, 2022

Inherently narrowband near-infrared organic photodetectors are highly desired for many applications, including biological imaging and surveillance. However, they suffer from a low photon-to-charge conversion efficiencies utilize spectral narrowing techniques which strongly rely on the used material or nano-photonic device architecture. Here, we demonstrate general facile approach towards wavelength-selective phtotodetection through intentionally n-doping 500-600 nm-thick nonfullerene blends. We show that an electron-donating amine-interlayer can induce n-doping, resulting in localized electric field near anode selective collection of photo-generated carriers this region. As only weakly absorbed photons reach region, devices have response at wavelengths close to absorption onset blends with high rejection ratio. These spectrally exhibit zero-bias external quantum ~20-30% 900-1100 nm, full-width-at-half-maximum ≤50 as well detectivities >1012 Jones.

Language: Английский

Citations

38
Enhanced sub-1 eV detection in organic photodetectors through tuning polymer energetics and microstructure DOI Creative Commons
Polina Jacoutot, Alberto D. Scaccabarozzi, Davide Nodari

et al.

Science Advances, Journal Year: 2023, Volume and Issue: 9(23)

Published: June 7, 2023

One of the key challenges facing organic photodiodes (OPDs) is increasing detection into infrared region. Organic semiconductor polymers provide a platform for tuning bandgap and optoelectronic response to go beyond traditional 1000-nanometer benchmark. In this work, we present near-infrared (NIR) polymer with absorption up 1500 nanometers. The polymer-based OPD delivers high specific detectivity D* 1.03 × 1010 Jones (-2 volts) at 1200 nanometers dark current Jd just 2.3 10-6 ampere per square centimeter -2 volts. We demonstrate strong improvement all metrics in NIR region compared previously reported due enhanced crystallinity optimized energy alignment, which leads reduced charge recombination. value 1100-to-1300-nanometer particularly promising biosensing applications. as pulse oximeter under illumination, delivering heart rate blood oxygen saturation readings real time without signal amplification.

Language: Английский

Citations

37
Trap‐Assisted Charge Generation and Recombination in State‐of‐the‐Art Organic Photodetectors DOI Creative Commons
Xiao Ma, René A. J. Janssen, Gerwin H. Gelinck

et al.

Advanced Materials Technologies, Journal Year: 2023, Volume and Issue: 8(16)

Published: June 19, 2023

Abstract The performance of organic photodetectors is steadily improving, and the specific detectivity, as a key figure merit, has reached values 10 12 –10 13 Jones, i.e., comparable to that silicon diodes but still considerably lower than intrinsic limit. As with other semiconductor devices, electrical state‐of‐the art photodiodes (OPDs) presently determined high degree by presence chemical impurities or structural defects which create carrier trapping states within bandgap active layer. This review aims provide comprehensive timely account trap‐assisted charge generation recombination in OPDs, emphasis on impact these phenomena photodetector parameters such as, noise dark current density, responsivity, response speed, ultimately, detectivity.

Language: Английский

Citations

28
Near-Infrared Electron Acceptors with Cyano-Substituted 2-(3-Oxo-2,3-dihydroinden-1-ylidene)malononitrile End-Groups for Organic Solar Cells DOI

Mingqun Yang,

Xiaoxin Tan,

Bingyan Yin

et al.

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(6), P. 2641 - 2651

Published: May 17, 2023

Near-infrared (NIR) electron acceptors are critical components for constructing organic solar cells (OSCs). Herein, we report a set of A-DA′D-A-type with end-groups cyano-substituted 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (CN-IC), which possesses the strongest electron-withdrawing ability among reported to date. An optical bandgap as low 1.29 eV was obtained CN-IC end-groups, is decreased by 0.12 respect that reference acceptor. Meanwhile, deep-lying frontier molecular orbital energy levels were maintained in these acceptors. These advantages endow broad light-harvesting range and capacity match prevalent polymer donors. Consequently, OSCs power conversion efficiency 18.1% obtained. results suggest huge potential NIR

Language: Английский

Citations

24
Flexible near-infrared organic photodetectors for emergent wearable applications DOI Creative Commons
Zehao Wang, Simin Cheng, Kenjiro Fukuda

et al.

Wearable electronics., Journal Year: 2024, Volume and Issue: 1, P. 53 - 77

Published: May 13, 2024

With the evolution of Industry 4.0, next-generation wearable devices have come under spotlight, where organic electronics are playing an important role due to their flexible form factor, high performance, and integration capability. Designed conform soft dynamic surfaces, photodetectors (OPDs) integrated arrays stand out for application potential in non-invasive biosensing bio-imaging, with inherent advantages mitigating motion artifacts – a notable limitation traditional, rigid photodetector systems. Leveraging near-infrared (NIR) spectrum's capability deep skin penetration minimal scattering human tissues, NIR OPDs especially capable precise diagnostics enhanced signal quality. The adaptable factor further broadens applications human-environment interaction, marking shift towards more responsive intelligent technologies. This review summarizes latest challenges breakthroughs OPDs, emphasizing effective strategies toward high-performance device units We discuss remaining outlook on vast reshaping our interaction surroundings.

Language: Английский

Citations

14
Ultranarrow-bandgap small-molecule acceptor enables sensitive SWIR detection and dynamic upconversion imaging DOI Creative Commons
Yongjie Chen, Yingqi Zheng, Jing Wang

et al.

Science Advances, Journal Year: 2024, Volume and Issue: 10(23)

Published: June 5, 2024

Short-wavelength infrared (SWIR) light detection plays a key role in modern technologies. Emerging solution-processed organic semiconductors are promising for cost-effective, flexible, and large-area SWIR photodiodes (OPDs). However, the spectral responsivity ( R ) specific detectivity D *) of OPDs restricted by insufficient exciton dissociation high noise current. In this work, we synthesized an small molecule with coverage 0.3 to 1.3 micrometers peaking at 1100 nanometers. The photodiode, optimized dissociation, charge injection, transmittance, achieves record 0.53 ampere per watt * 1.71 × 10 13 Jones 1110 nanometers under zero bias. 1 1.2 surpasses that uncooled commercial InGaAs photodiode. Furthermore, semitransparent all-organic upconversion devices integrating photodiode realized static dynamic SWIR-to-visible imaging, along excellent efficiency spatial resolution. This work provides alternative insights developing sensitive detection.

Language: Английский

Citations

14