A visible to near-infrared nanocrystalline organic photodetector with ultrafast photoresponse

Xu, Wenzhan; Gao, Yu; Qian, Kun; Wang, Bingzhe; Xu, Rongguo; He, M.; Li, Tao; Xing, Guichuan; Yang, Shihe; Wei, Guodan

doi:10.1039/d2tc00730d

Cited by 13 publications

(17 citation statements)

References 63 publications

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“…However, the OPD detection performance of polymethine dyes is still behind those of state‐of‐ the‐art organic semiconductors, which have achieved responsivities approaching 0.5 A·W −1 and D * over 10 13 Jones, despite mainly in a spectral region below 950 nm. [ 40,43,108‐109 ] Nonetheless, the sharp and intense NIR absorption features of polymethines make them ideal NBA materials candidates for the narrowband NIR photodetection, and now specific response spectra ranging from 750 to 1050 nm with FWHM values well below 100 nm have been demonstrated in thin film devices, which are comparable to the internally filtered devices with thick active layers based on state‐of‐the‐art organic semiconductors. [ 110 ] Furthermore, based on the current results, it is reasonable to predict the detection wavelength of polymethine‐based OPDs can be further improved to be beyond 1500 nm, which is really very challenging for other traditional organic semiconductors.…”

Section: Discussionmentioning

confidence: 99%

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†

Xiao

Shao

et al. 2023

Chin. J. Chem.

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Comprehensive Summary Near‐infrared organic photodiodes (NIR OPDs) have tremendous potential in industrial, military, and scientific applications, due to their unique features of lightweight, low toxicity, high structural flexibility, cooling‐system‐free, etc. However, the overall performance of currently available NIR OPDs still lags behind the commercial inorganic photodetectors, ascribed to the critical challenge of realizing organic semiconductors with sufficiently low optical bandgap and excellent optoelectronic properties simultaneously. Among various types of NIR‐absorbing organic semiconductors, polymethine dyes not only possess advantages of simple synthesis and structural diversity, but also show fascinating optical and aggregation features in the solid state, making them attractive material candidates for NIR OPDs. In this review, after a brief introduction of NIR OPDs and polymethine dyes, we comprehensively summarize the advances of polymethine dyes for broadband and narrowband NIR OPDs, and further introduce their applications in all‐organic optical upconversion devices and photoplethysmography sensors. In particular, the relationship between the chemical structure and the aggregation behaviors of polymethine dyes and the device performance is carefully discussed, providing some important molecular insights for developing high performance NIR OPDs.

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Section: Discussionmentioning

confidence: 99%

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†

Xiao

Shao

et al. 2023

Chin. J. Chem.

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“…Finally, Ag is thermally evaporated under a shadow mask. [ 34 ] The fabrication process for imaging arrays and photodetectors is similar.…”

Section: Methodsmentioning

confidence: 99%

A Flexible Sensitive Visible‐NIR Organic Photodetector with High Durability

Gao

et al. 2023

Adv Materials Technologies

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Low‐cost, deformable visible‐near‐infrared (visible‐NIR) photodetectors can be configured into non‐planar shapes to meet emerging optical needs. However, it remains challenging to develop low‐cost flexible visible‐NIR photosensor with excellent mechanical deformability and high optical detectivity. Herein, we report a flexible visible‐NIR organic photodetector (OPD) based on a blend film of D18:BTP‐4F as the active layer on a polyethylene naphthalate substrate. Owing to the low exciton binding energy of BTP‐4F and the preferred orientation of the D18:BTP‐4F film, the as‐fabricated OPD exhibits excellent self‐powered optoelectronic performances with a high responsivity, high detectivity, and fast response time of 206 mA W−1, 6.45 × 1012 Jones (1 Jones = 1 cm Hz1/2 W−1), and 9 µs at the wavelength of 800 nm and bias voltage of 0 V, respectively. After 1000 bending/releasing cycles with an angle of 150° at a radius of curvature of 3 mm, the current‐voltage curves remain stable both measured under dark and light illumination, indicating obvious device operation robustness. The reliable linear photosensitivity of the as‐obtained OPD is demonstrated by the photoresponse under a range of different incident light intensities and its practical application for wearable health monitoring such as heart rate measurement is well demonstrated. Furthermore, a flexible visible‐NIR image sensor for imaging acquisition is shown by demonstrating 5 × 5 OPD array under 850 nm light irradiation. The collective results on blend film design, flexible device fabrication and characterization, and imager development shed light on sought‐after visible‐NIR photosensing and imaging systems.

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“…[ 63 ] Also, developing synthetic nanopores with excellent ion selectivity and other ion‐specific effects through various strategies is still a very important task in the future. [ 64–70 ]…”

Section: Ion‐specific Effects In Confined Nanochannels and Nanoporesmentioning

confidence: 99%

Ion‐specific effects in confined nanochannels and neural network

Wei

Wang

2022

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Since the discovery of biological ion channels and their role in physiology, scientists have been trying to create artificial structures that mimic biological ion channels. Nanochannels such as biological/solid‐state nanopores and porous nanostructures can have fine‐tuned ion behaviors in a confined space where ions are “aggregated”. Thus, one of the most exciting applications of nanochannels is artificial neurons and neural network based on the ion‐specific effects and nanofluidics. In this review article, it is the first time that the ion aggregation behaviors inside the confined nanochannels are summarized, and their connection to neuroscience, especially the artificial neurons and neural network, is explored and envisioned.

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A visible to near-infrared nanocrystalline organic photodetector with ultrafast photoresponse

Abstract: Organic photoelectron conversion devices, prized for their solution process and wide use in portable devices, have attracted intensive interests. Herein, newly developed active layer of D18:Y6 is used to fabricate...

Cited by 13 publications

References 63 publications

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†

A Flexible Sensitive Visible‐NIR Organic Photodetector with High Durability

Ion‐specific effects in confined nanochannels and neural network

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A visible to near-infrared nanocrystalline organic photodetector with ultrafast photoresponse

Abstract: Organic photoelectron conversion devices, prized for their solution process and wide use in portable devices, have attracted intensive interests. Herein, newly developed active layer of D18:Y6 is used to fabricate...

Cited by 13 publications

References 63 publications

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes†

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes†

A Flexible Sensitive Visible‐NIR Organic Photodetector with High Durability

Ion‐specific effects in confined nanochannels and neural network

Contact Info

Product

Resources

About

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†