Self-Powered broadband photodetection of copper phthalocyanine by enhancing photogating effect with monolayer MoS2 flakes

K, Navaneeth Krishnan; Sreedharan, Anjusree; Sagar, Srikrishna; Manamel, Litty Thomas; Mukherjee, Arka; Das, Bikas C.

doi:10.1016/j.apsusc.2021.150818

Cited by 16 publications

(12 citation statements)

References 41 publications

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“…31 The obtained n value of CuPc-HT:PC 71 BM devices was 1.61 K B T/q. This value is comparable with those of the reported PC-based OPDs, 32,33 and thus it is expected to be low enough to suppress the trap-assisted recombination in V oc condition.…”

Section: Opd Propertiessupporting

confidence: 83%

Synthesis and characterization of a copper(II) phthalocyanine‐based dye for organic photodetectors

Kim

Kang

Jung

2022

Bulletin Korean Chem Soc

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Novel copper(II) 4,4 0 ,4 00 ,4 000 -tetra(hexylthienyl)phthalocyanine (CuPc-HT) was synthesized via Stille coupling reaction between 2-trimethylstannyl-5-hexylthiophene and tetra-brominated copper(II) phthalocyanine (CuPc). The incorporation of hexylthiophene to CuPc increased organic solubility, Q-band absorption and p-type characteristics. The bulk heterojunction organic photodetectors (OPDs) were developed by blending CuPc-HT with n-type [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM). CuPc-HT:PC 71 BM-based devices showed the strong green light detection in the range of 400-600 nm. The measured specific detectivity (D*) was 3.1 Â 10 11 Jones under 530 nm lightemitting diode (LED) light of 0.1 mW/cm 2 at À2 V, which was approximately three times higher than those under 680 nm red LED irradiation. Dynamic characteristics of OPDs were investigated, and the À3 cut-off frequency of CuPc-HT:PC 71 BM devices was extremely high as 0.1 MHz. Notably, the signal response time at À1.0 V was ultrafast to be 9 μs. Even though CuPc-HT:PC 71 BM devices showed insufficient static properties, their dynamic characteristics were comparable with those of state-of-the-art OPDs.

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Section: Opd Propertiessupporting

confidence: 83%

Synthesis and characterization of a copper(II) phthalocyanine‐based dye for organic photodetectors

Kim

Kang

Jung

2022

Bulletin Korean Chem Soc

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“…31 Similarly, A g -like phonon peaks of ReS 2 centered at 212.3 and 235.7 cm −1 in the dark are also blue-shifted about 1.2 cm −1 (Δw 2 ) and 1.4 cm −1 (Δw 3 ), respectively, which strongly indicate an n-type carrier doping in the ReS 2 layer under light illumination by the hole capture processes as proposed previously. 16,32,33 In the above shed of concept, we found a dip in the photocurrent response for the low-light intensity at the beginning of testing, which disappeared later on for higher intensities, as shown in Figure 4c. After the sudden light illumination, the thermal carrier concentration drops initially due to the capturing process by the photoactivated traps inside the forbidden energy gap of ReS 2 , as illustrated by the energy band diagram in Figure 4a, and the overall carrier concentration reduces accordingly for a short while at lower intensities, which results in the onset of negative photoconductance (NPC).…”

Section: Resultsmentioning

confidence: 99%

“…Photoluminescence shows intrinsic defects mediated a large Stokes’ shift of about 117 meV (59.1 nm). Raman scattering spectra were recorded to confirm large-area continuous film growth and the presence of the SiO 2 /ReS 2 interface-mediated photogating effect . Then, two-terminal planar devices of the structure Pd/ReS 2 /Pd were fabricated and demonstrated photoreceptor-cum optic nerve synaptic functionality in addition to the superior photodetection property for the hardware implementation of neuromorphic computing.…”

Section: Introductionmentioning

confidence: 99%

Large-Area Growth of Two-Dimensional Rhenium Disulfide Depicting Robust Artificial Photoreceptor-cum-Optic Nerve Synaptic Functionality

Sagar

Mukherjee

et al. 2023

ACS Appl. Opt. Mater.

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The impact of artificial vision is surging all around, starting from automotive industries to neuromorphic computing, and it needs both software and hardware platforms. Despite massive progress through software-based simulations for artificial vision systems, hardware implementation still needs to catch up due to the material processing and device fabrication complexity. Here, we demonstrated a very simple two-terminal planar photodetector device to mimic functions of photoreceptors similar to the retina followed by potentiation of optic nerve synapse using a chemical vapor deposition (CVD)-grown two-dimensional rhenium disulfide (2D ReS2) monolayer film. First, large-area 2D ReS2 monolayer growth facilitated through organic seeding promoted the chemical vapor deposition route. The direct band gap of 1.5 eV and Peierls distorted 1T crystalline phase of ReS2 were identified from the Tauc plot analysis and transmission electron microscopy results. Then, the photodetection property and photoreceptor functionality were measured after depositing interdigitated palladium electrodes. Raman scattering and temporal photoresponse confirm that the oxide-interface-induced photogating effect plays a significant role in such functionalities. Photomodulated visual nervous system-related basic functions, including excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), and the simplest Atkinson–Shiffrin memory model, are verified efficiently even at elevated temperatures. Overall, this work can lead to an innovative research direction toward developing atomically thick photonic devices, which would be an innovative technology for artificial intelligence (AI), machine learning (ML), and optogenetics in the future.

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“…In contrast, the photogating effect is regarded as a facile method to improve responsivity by trapping certain types of carriers through defects or artificially designed hybrid structures. [21][22][23] Current researches on the photogating effect mainly focus on low-dimensional materials with photoresponse in the visible to infrared range and most cases exhibit limited responsivity enhancement depending on the band alignment. [24][25][26][27][28] So far, transparent photodetectors based on the photogating effect have not been reported, especially in the UV band.…”

Section: Introductionmentioning

confidence: 99%

Fully Transparent Ultraviolet Photodetector with Ultrahigh Responsivity Enhanced by MXene‐Induced Photogating Effect

Fang

Liu

et al. 2023

Advanced Optical Materials

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Transparent photodetectors with the optical signal recognition and conversion capabilities are the core component for smart sensors and next-generation "see-through" optoelectronics. However, it is usually difficult to have both excellent optical transmittance and photoresponse performance, which hinders the practicality of transparent photodetectors. Herein, a photogating effect enhanced transparent ultraviolet (UV) photodetector is demonstrated based on the TiO 2 /MXene van der Waals heterojunction. By simply spin-coating MXene nanosheets on TiO 2 film, the UV photodetector exhibits significantly enhanced performance, such as ultrahigh responsivity (202.4 A/W), large specific detectivity (1.79 × 10 14 Jones) and outstanding external quantum efficiency (1.02 × 10 5 %), which are three orders of magnitude higher than those of pure TiO 2 film. Meanwhile, the device exhibits up to 95% transparency in the visible range. Both the experimental results and theory calculations indicate that local Schottky junctions are established at the TiO 2 /MXene interface. These local junctions exert a giant photogating effect under illumination, which can facilitate the separation of photogenerated carriers and improve the photodetection performance. Moreover, the transparent photodetector has been successfully applied in a UV index wireless sensing system. This work demonstrates the ingenious application of MXene in optoelectronics and provides insight into the design of high-performance transparent photodetectors.

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Self-Powered broadband photodetection of copper phthalocyanine by enhancing photogating effect with monolayer MoS2 flakes

Cited by 16 publications

References 41 publications

Synthesis and characterization of a copper(II) phthalocyanine‐based dye for organic photodetectors

Synthesis and characterization of a copper(II) phthalocyanine‐based dye for organic photodetectors

Large-Area Growth of Two-Dimensional Rhenium Disulfide Depicting Robust Artificial Photoreceptor-cum-Optic Nerve Synaptic Functionality

Fully Transparent Ultraviolet Photodetector with Ultrahigh Responsivity Enhanced by MXene‐Induced Photogating Effect

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