Wearable electronics., Год журнала: 2025, Номер unknown
Опубликована: Май 1, 2025
Язык: Английский
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Сен. 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.
Язык: Английский
Процитировано
23
Sensors and Actuators A Physical, Год журнала: 2025, Номер unknown, С. 116459 - 116459
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
3
Advanced Materials, Год журнала: 2024, Номер 36(41)
Опубликована: Авг. 17, 2024
Abstract The performance of organic photodetectors (OPDs) sensitive to the short‐wavelength infrared (SWIR) light lags behind commercial indium gallium arsenide (InGaAs) primarily due scarcity semiconductors with efficient photoelectric responses exceeding 1.3 µm. Limited by Energy‐gap law, ultralow‐bandgap usually suffer from severe non‐radiative transitions, resulting in low external quantum efficiency (EQE). Herein, a difluoro‐substituted quinoid terminal group (QC‐2F) exceptionally strong electron‐negativity is developed for constructing new non‐fullerene acceptor (NFA), Y‐QC4F an ultralow bandgap 0.83 eV. This subtle structural modification significantly enhances intermolecular packing order and density, enabling absorption onset up 1.5 µm while suppressing non‐radiation recombination films. SWIR OPDs based on achieve impressive detectivity ( D *) over 10 11 Jones 0.4 under 0 V bias, maximum 1.68 × 12 at 1.16 Furthermore, demonstrate competitive high‐quality imaging even 1.4 irradiation.
Язык: Английский
Процитировано
16
Science Advances, Год журнала: 2024, Номер 10(30)
Опубликована: Июль 24, 2024
Ultrathin flexible photodetectors can be conformably integrated with the human body, offering promising advancements for emerging skin-interfaced sensors. However, susceptibility to degradation in ambient and particularly aqueous environments hinders their practical application. Here, we report a 3.2-micrometer-thick water-resistant organic photodetector capable of reliably monitoring vital sign while submerged underwater. Embedding photoactive layer an adhesive elastomer matrix induces multidimensional hybrid phase separation, enabling high adhesiveness on both top bottom surfaces maintained charge transport. This improves water-immersion stability ensures robust sealing interfaces within device, notably suppressing fluid ingression environments. Consequently, our fabricated ultrathin demonstrates deionized water or cell nutrient media over extended periods, detectivity, resilience cyclic mechanical deformation. We also showcase its potential
Язык: Английский
Процитировано
14
Advanced Materials, Год журнала: 2024, Номер 36(38)
Опубликована: Июль 30, 2024
Abstract Near‐infrared (NIR) organic photodetectors (OPDs), particularly all‐polymer‐based ones, hold substantial commercial promise in the healthcare and imaging sectors. However, process of optimizing their active layer composition to achieve highly competitive figures merit lacks a clear direction methodology. In this work, celebrity polymer acceptor PY‐IT into more NIR absorbing host system PBDB‐T:PZF‐V, significantly enhance photodetection competence, is introduced. The refined all‐polymer ternary broadband photodetector demonstrates superior performance metrics, including experimentally measured noise current as low 6 fA Hz −1/2 , specific detectivity reaching 8 × 10 12 Jones, linear dynamic range (LDR) 145 dB, swift response speed surpassing 200 kHz, striking fair balance between sensitivity speed. Comprehensive morphological photophysical characterizations elucidate mechanisms behind observed enhancements study, which include reduced trap density, enhanced charge transport, diminished recombination, balanced electron/hole mobilities. Moreover, practical deployment potential proof‐of‐concept device self‐powered mode demonstrated through application machine learning‐based cuffless blood pressure (BP) estimation high‐resolution computational across complex environments, where they are found quantitatively rival silicon diodes.
Язык: Английский
Процитировано
7
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Фев. 16, 2025
Abstract The growing importance of high‐speed and energy‐efficient photodetectors in broadband communication has sparked widespread interest organic materials owing to their tunable optical characteristics ease production. However, this Schottky‐type photodetector (OPD) low detectivity a high dark current, requiring additional voltage biasing. Herein, the development highly sensitive self‐powered OPD with metal‐semiconductor‐insulator‐metal (MSIM) structure (ITO/PEDOT:PSS/Organic photoactive layer/dielectric/silver) is presented, using polymer PM6, acceptor Y6, its blend parylene as dielectric layer for spectral detection spanning visible near‐infrared (NIR) range at speeds. Such new class devices can produce fast transient photocurrent signals opposite polarity both under light ON/OFF cycles response pulsed stimuli, which makes inherently more distinguishable. detailed measurements are performed fabricated MSIM different illumination conditions various operational frequencies, PM6:Y6‐based found be most compared single‐component due increased charge generation accumulation without Further, faster time (≈nanosecond) positive negative peaks remarkably cutoff frequency 5.6 MHz outperformed state‐of‐the‐art OPD. extraordinary performance demonstrated by real‐time NIR ASCII codes suggests potential infrared communication. signal offers novel platform next‐generation transient‐type photodetectors, enhancing need biasing across wide applications.
Язык: Английский
Процитировано
1
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Фев. 19, 2025
Abstract Near‐infrared organic photodetectors (NIR‐OPDs) have emerged as increasingly significant in optoelectronics, offering unparalleled advantages for applications health monitoring and night vision. The development of self‐powered devices with low dark currents enhanced NIR sensitivity involves complex engineering that requires careful material selection, defect state density control, environmental consideration. In this study, an innovative approach is introduced utilizes solid additive (DIB) to induce improvements the J‐aggregation morphology exciton delocalization acceptor molecules. goal broaden response spectrum device augment its detection capabilities. key findings revealed exhibit electrostatic affinity acceptors, which facilitates their orderly face‐to‐face stacking controls π–π distance. These intermolecular interactions lead electron–hole pairs, reduced recombination, increased charge separation efficiency. Consequently, modified exhibited exceptional specific detectivity, exceeding 10 14 Jones across wavelength range 695–860 nm, thereby establishing a new standard photodetection. Overall, study successfully addressed compatibility challenges associated NIR‐OPDs, expanding potential various settings.
Язык: Английский
Процитировано
1
Chemical Research in Chinese Universities, Год журнала: 2024, Номер 40(4), С. 712 - 721
Опубликована: Июнь 15, 2024
Язык: Английский
Процитировано
6
Advanced Materials, Год журнала: 2024, Номер unknown
Опубликована: Июль 23, 2024
Abstract Shortwave‐infrared (SWIR) photodetectors are vital for many scientific and industrial applications including surveillance, quality control inspection. In recent decades, based on organic semiconductors have emerged, demonstrating potential to add real value broadband narrowband imaging sensing scenarios, where factors such as thermal budget sensitivity, large area aperture necessity, cost considerations, lightweight conformal flexibility demands prioritized. It is now recognized that the performance of (OPDs), notably their specific detectivity, ultimately limited by trap states, universally present in disordered semiconductors. This work adopts an approach utilizing these mid‐gap states specifically create a SWIR photo‐response. To this end, introduces somewhat counter‐intuitive “trap‐doping” bulk heterojunction (BHJs) photodiodes, small quantities guest molecule intentionally incorporated into semiconducting donor:acceptor host system. Following approach, demonstrates proof‐of‐concept visible‐to‐SWIR OPD, approaching (and, some extent, even exceeding) state‐of‐the‐art across critical photodetector metrics. The trap‐doping is, though only currently, broadly applicable various spectral windows. represents new modality engineering photodetection using unconventional strategy turning limitation feature.
Язык: Английский
Процитировано
5
Advanced Materials, Год журнала: 2024, Номер unknown
Опубликована: Дек. 18, 2024
Photoagents with ultra-high near-infrared II (NIR-II) light energy conversion efficiency hold great promise in tumor phototherapy due to their ability penetrate deeper tissues and minimize damage surrounding healthy cells. However, the development of NIR-II photoagents remain challenging. In this study, an all-fused-ring quinoidal acceptor-donor-acceptor (A-D-A) molecule, SKCN, a BTP core is synthesized, nanoparticles named FA-SNPs are prepared. The unique structure enhances π-electron delocalization bond length uniformity, significantly reducing bandgap resulting strong absorption, high molar extinction coefficient, photothermal 75.14%. Enhanced molecular rigidity also facilitates efficient transfer oxygen, boosting reactive oxygen species generation. By incorporating immunomodulator R848, FA-SRNPs further developed, effectively modulating immune microenvironment by Tregs M-MDSCs infiltration, promoting dendritic cell maturation, M1 macrophage polarization, activating CD8+ T cells NK Comprehensive studies using orthotopic ovarian cancer models demonstrated targeting, photoacoustic imaging capabilities, significant suppression metastasis inhibition, showing excellent therapeutic efficacy breast model. This study provides evidence for potential application A-D-A molecules photoimmunotherapy.
Язык: Английский
Процитировано
5