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Bhat, Gurudutt; Kielar, Marcin; Rao, Haixia; Gholami, Mahnaz D.; Mathers, Isabel; Larin, Astrid C. R.; Flanagan, Thomas; Erdenebileg, Enkhtur; Bruno, Annalisa; Pannu, Amandeep Singh; Fairfull‐Smith, Kathryn E.; Izake, Emad L.; Sah, Pankaj; Lam, Yeng Ming; Pandey, Ajay K.; Sonar, Prashant

doi:10.1002/inf2.12395

Cited by 6 publications

(10 citation statements)

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“…In general, adjusting the blend ratio alters the blend morphology and affects the performance of organic optoelectronic devices. [ 22 ] Here, we used atomic force microscopy (AFM) and grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) to examine the blend morphologies. Figure a displays topographical and phase images of the 1:1 and 1:1.2 (250 nm) blend films.…”

Section: Resultsmentioning

confidence: 99%

Efficient, Ambient‐Stable, All‐Polymer Organic Photodetector for Machine Learning‐Promoted Intelligent Monitoring of Indoor Plant Growth

Jiang

Lin

Shiu

et al. 2023

Advanced Optical Materials

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The blend ratio and thickness of the PM6:PY‐IT active layer are optimized to realize highly efficient all‐polymer organic photodetectors (OPDs). Ultralow dark current densities of less than 5.92 × 10−10 A cm−2 (at −1 V) appear when the PM6:PY‐IT active layers have thicknesses in the range of 250–400 nm and blend ratios between 1:1 and 1:1.4, suggesting a wide fabrication window. Fast rise/fall times of 560/250 ns are measured with a cut‐off frequency of 530 kHz for the OPD incorporating a 250‐nm‐thick 1:1 blend. This OPD provides superior performance, with a high detectivity of 2.98 × 1013 Jones and a wide linear dynamic range of 138 dB (at 530 nm (−1 V)). In addition, the ultralow dark current of the OPD retains excellent long‐term stability over 500 h of aging testing (thermal stress, ambient conditions, and continuous illumination). With the integration of specific light filters, a system is realized for the efficient detection of indoor plant‐growth lighting, allowing the rapid and accurate detection (>97%) of photosynthetic photon flux at various wavelengths of light that directly determine the photosynthesis and photomorphogenesis of indoor plants, supervised by machine learning. The artificial intelligence‐trained OPD effectively improves detection accuracy.

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Section: Resultsmentioning

confidence: 99%

Efficient, Ambient‐Stable, All‐Polymer Organic Photodetector for Machine Learning‐Promoted Intelligent Monitoring of Indoor Plant Growth

Jiang

Lin

Shiu

et al. 2023

Advanced Optical Materials

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“…Structurally, it is the simplest of the NIR-AZA uorophore class, which is more commonly further derivatised to suit a diverse set of biological and material purposes. [8][9][10][11][12][13][14][15][16][17] Previously we have shown that 1 and P 188 spontaneously undergo a DSA in water to form nanoparticles NP1-P 188 of ∼100 nm size with the uorescence from 1 quenched (Fig. 1C).…”

Section: Introductionmentioning

confidence: 87%

“…Structurally, it is the simplest of the NIR-AZA fluorophore class, which is more commonly further derivatised to suit a diverse set of biological and material purposes. 8–17…”

Section: Introductionmentioning

confidence: 99%

Exploiting directed self-assembly and disassembly for off-to-on fluorescence responsive live cell imaging

et al. 2022

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“…[ 2–5 ] The unique optoelectronic properties of π‐conjugated organic semiconductors have found countless applications, including image sensing, [ 6–8 ] colour discrimination, [ 7,8 ] optical communication, [ 7,9 ] X‐Ray detection, [ 10,11 ] electronic skin (e‐skin), [ 7,12 ] medical implants, [ 13,14 ] brain sensors [ 15–17 ] and health monitoring. [ 18–20 ] Near‐infrared (NIR) OPDs, [ 21,22 ] that offer additional advantages of reduced light scattering, minimal absorption and high tissue penetration, [ 23–25 ] have been of capital importance in optical, biomedical and photoacoustic imaging, [ 23,26–28 ] as well for food quality inspection, [ 29 ] artificial vision, [ 30,31 ] night vision [ 32 ] and military surveillance. [ 33 ] While much progress has been demonstrated in recent years, [ 24,34 ] NIR OPDs remain challenging to manufacture, especially in the short‐wave infrared region (SWIR, 1–3 µm).…”

Section: Introductionmentioning

confidence: 99%

Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing

Bhat,

Kielar,

Sah

et al. 2023

Adv Elect Materials

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Organic photodetectors (OPDs) detecting light in the near‐infrared (NIR) range from 900 to 1200 nm offer numerous applications in biomedical imaging and health monitoring. However, an ultra‐low bandgap of the electron donor compound required to achieve NIR detection poses a unique challenge in selecting a complementary acceptor material with a suitable energy‐level offset. To tackle this, a solution‐processed, fullerene‐dominated, ternary device is engineered by adding an ultra‐low bandgap (0.6–0.8 eV) ambipolar polymer, polybenzobisthiadiazole‐dithienocyclopentane (PBBTCD), into the active layer of visible‐light‐responsive OPDs (bandgap of 1.8 eV) to form a ternary blend. The resulting OPD benefits from the extended absorption beyond 1000 nm. The cascaded energy level alignment within the ternary blend and the applied reverse bias both improve the overall NIR photocurrent responsivity by 2 orders of magnitude, reaching 0.4 mA W−1 at 1050 nm and −2 V for ternary devices. Furthermore, a photovoltage responsivity of 0.3 mV m2 W−1 along with significant open‐circuit voltage (Voc) of 0.12 V allow NIR detection in the Voc mode. Prominently, this ability is accomplished with a minimal presence of PBBTCD. Taken together, this work indicates potential strategies for extending the spectral activity of conventional OPDs through introduction of an ambipolar ultra‐low bandgap polymer as a minor element.

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Cited by 6 publications

References 0 publications

Efficient, Ambient‐Stable, All‐Polymer Organic Photodetector for Machine Learning‐Promoted Intelligent Monitoring of Indoor Plant Growth

Efficient, Ambient‐Stable, All‐Polymer Organic Photodetector for Machine Learning‐Promoted Intelligent Monitoring of Indoor Plant Growth

Exploiting directed self-assembly and disassembly for off-to-on fluorescence responsive live cell imaging

Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing

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