Broad‐Spectral‐Response Nanocarbon Bulk‐Heterojunction Excitonic Photodetectors

Xie, Yu; Gong, Maogang; Shastry, Tejas A.; Lohrman, Jessica; Hersam, Mark C.; Ren, Shenqiang

doi:10.1002/adma.201300292

Cited by 101 publications

(99 citation statements)

References 46 publications

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“…By using the above equation, the LDR is estimated to be 58.8 dB which is higher than that of the SWCNT/PCBM heterojunction (40 dB)38. Such a relatively large LDR suggests the great linear response characteristic of the device.…”

Section: Resultsmentioning

confidence: 93%

“…Table 1 summarizes the response speed, responsivity and detectivity of the present device and other CNTs based photodetectors. It is obvious that the SLG-CNTF Schottky junction has a high responsivity (209 mAW −1 ) and detectivity (4.87 × 10 10 cmHz 1/2 W −1 ), which are not only better than the device solely composed of pure SWCNTF9 and MWCNTF11, but also than the devices assembled from SWCNT/PCBM38, and MWCNT/graphene nanocomposite structures13.…”

Section: Resultsmentioning

confidence: 99%

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Broadband photodetector based on carbon nanotube thin film/single layer graphene Schottky junction

Zhang

Wang

et al. 2016

Sci Rep

107

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In this study, we present a broadband nano-photodetector based on single-layer graphene (SLG)-carbon nanotube thin film (CNTF) Schottky junction. It was found that the as-fabricated device exhibited obvious sensitivity to a wide range of illumination, with peak sensitivity at 600 and 920 nm. In addition, the SLG-CNTF device had a fast response speed (τr = 68 μs, τf = 78 μs) and good reproducibility in a wide range of switching frequencies (50–5400 Hz). The on-off ratio, responsivity, and detectivity of the device were estimated to be 1 × 102, 209 mAW−1 and 4.87 × 1010 cm Hz1/2 W−1, respectively. What is more, other device parameters including linear performance θ and linear dynamic range (LDR) were calculated to be 0.99 and 58.8 dB, respectively, which were relatively better than other carbon nanotube based devices. The totality of the above study signifies that the present SLG-CNTF Schottky junction broadband nano-photodetector may have promising application in future nano-optoelectronic devices and systems.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Broadband photodetector based on carbon nanotube thin film/single layer graphene Schottky junction

Zhang

Wang

et al. 2016

Sci Rep

107

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“…These polymers can be blended with semiconducting nanotubes to form so-called bulk heterojunctions (BHJs), [44,59] introducing numerous nanoheterojunctions in the whole blended film. The free electrons and holes from the separation at the junctions give the photocurrent under an applied electric field.…”

Section: Cnt Photoconductorsmentioning

confidence: 99%

Uncooled Carbon Nanotube Photodetectors

Léonard

Kono

2015

Advanced Optical Materials

154

166

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Photodetectors play key roles in many applications such as remote sensing, night vision, reconnaissance, medical imaging, thermal imaging, and chemical detection. Several properties such as performance, reliability, ease of integration, cost, weight, and form factor are all important in determining the attributes of photodetectors for particular applications. While a number of materials have been used over the past several decades to address photodetection needs across the electromagnetic spectrum, the advent of nanomaterials opens new possibilities for photodetectors. In particular, carbon-based nanomaterials such as carbon nanotubes (CNTs) and graphene possess unique properties that have recently been explored for photodetectors. Here, we review the status of the field, presenting a broad coverage of the different types of photodetectors that have been realized with CNTs, placing particular emphasis on the types of mechanisms that govern their operation. We present a comparative summary of the main performance metrics for such detectors, and an outlook for performance improvements.2

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“…[ 55,56 ] In our work, the availability of polymers with 0-100% side-chain content allows for investigation into correlation between the polymer properties and fi lm morphology that may be altered only by side chains and the device performance such as photoresponse, dark current and detectivity of polymer photodetectors. Assuming that the shot noise from the dark current is a major contributor to the noise, [ 35,[58][59][60] the specifi c detectivity can be expressed as: The active layer is comprised of one of P1 -P5 and (6,6)-phenyl C 61 butyric acid methyl ester (PCBM) in a weight ratio of 1:2.…”

Section: Fabrication and Characterization Of Polymer Photodetectorsmentioning

confidence: 99%

Optimization of Solubility, Film Morphology and Photodetector Performance by Molecular Side‐Chain Engineering of Low‐Bandgap Thienothiadiazole‐Based Polymers

Zhou

Yang

et al. 2014

Adv Funct Materials

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7605wileyonlinelibrary.com good solubility and satisfactory device performance is critically important for polymer optoelectronic materials to be used for solution-processed large-scale device applications. Side chains on conjugated polymers can directly affect the solubility and also play a multifunctional role in modulating the molecular energy level, solid state packing and fi lm morphology, which all have signifi cant impact on device performance. A fl exible, long or bulky side chain is often introduced to impart solubility to conjugated polymers. In addition, subtle changes in the side chain can dramatically infl uence the aggregation behavior of conjugated polymers in the solid state, in particular with regard to their molecular stacking and fi lm morphology, which are extraordinarily important for device application but usually diffi cult to predict. [17][18][19][20][21] The infl uence of side chains on polymer property and device performance has largely been overlooked and less studied. [ 3,22 ] Recent studies show that the effect of side chains on the polymer properties, not just solubility, can be very signifi cant, and sometimes even unexpected. [23][24][25][26] The studies on the effect of side chains typically involves the selection of chain type, size and location, but usually without guidelines and lack of a comprehensive understanding. [27][28][29] Therefore, systemic investigations into the structure-property relationship are required, especially for some conjugated polymers that are promising for use in optoelectronic devices in order to optimize the device performance. [30][31][32][33][34] One of such polymers is poly[5,7-bis(2-thienyl)-thieno(3,4b ) diathiazole-thiophene-2,5] (PDDTT), as it has been successfully used in polymer photodetectors with high detectivity in a broad spectral region. [35][36][37] The low solubility of PDDTT in common organic solvents implies a potential for side-chain engineering, which may lead to changes in solubility and fi lm morphology and subsequent optimization of photodetector performance. [ 38,39 ] In this work, we chose the PDDTT analogs having the terthiophene and thienothiadiazole (TT) units in the main chain and the dodecyl group on the side chain ( Scheme 1 ). If different numbers of dodecyl groups are introduced, the polymer properties such as solubility, absorption, energy level, molecular stacking and fi lm morphology are expected to change, which may lead to further optimization of polymer photodetectors. [ 40 ] A series of donor-acceptor (D-A) type low-bandgap polymers containing the terthiophene and thieno[3,4-b ]thiadiazole units in the main chain but different numbers of identical side chains are designed and synthesized in order to study the effect of side chain on the polymer properties and optimize the performance of polymer photodetectors. Variation in the side chain content can infl uence the polymer solubility, molecular packing, and fi lm morphology, which in turn affects the photodetector performance, particularly with regard to the photo...

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Broad‐Spectral‐Response Nanocarbon Bulk‐Heterojunction Excitonic Photodetectors

Cited by 101 publications

References 46 publications

Broadband photodetector based on carbon nanotube thin film/single layer graphene Schottky junction

Broadband photodetector based on carbon nanotube thin film/single layer graphene Schottky junction

Uncooled Carbon Nanotube Photodetectors

Optimization of Solubility, Film Morphology and Photodetector Performance by Molecular Side‐Chain Engineering of Low‐Bandgap Thienothiadiazole‐Based Polymers

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