Green synthesis of graphene quantum dots and the dual application of graphene quantum dots-decorated flexible MSM p-type ZnO device as UV photodetector and piezotronic generator

Fathima, Nazia; Pradeep, N.; Balakrishnan, Jyothi

doi:10.1007/s12034-020-02326-w

Cited by 17 publications

(3 citation statements)

References 30 publications

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“…Another example of a beneficial synergy between GQDs and ZnO features concerns a high promise of related nanohybrids for design of next-generation ultraviolet (UV) photodetectors. [16][17][18][19][20][21][22][23][24][25][26][27][28][29] On one hand, the presence of GQDs may favor separation and transport of the photogenerated carriers, thus reducing both the electron-hole recombination and the photoresponse time. Since GQDs have a good response to UV light, sensitization with GQDs may, on the other hand, enhance the overall UV absorption in ZnO and hence the photoconductivity of ZnO-based photodetector.…”

Section: Introductionmentioning

confidence: 99%

Nature of photoexcited states in ZnO-embedded graphene quantum dots

Shtepliuk

Yakimova

2023

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Nature of photoexcited states in ZnO-embedded graphene quantum dots

Shtepliuk

Yakimova

2023

Phys. Chem. Chem. Phys.

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“…Furthermore, the interdigitated electrodes can prevent the inside light from exiting, leading to increase in light absorption. [ 76 ] Thanks to the photolithography and e‐beam evaporation processes, the interdigitated electrodes of Ti/Au (50/200 nm) were fabricated onto the NWs to make PD‐A, PD‐B, and PD‐C (Figure S1b,f,i, Supporting Information). The gap between the contacts and the size of the interdigitated electrode were about 10 and 5 μm, respectively.…”

Section: Methodsmentioning

confidence: 99%

Detached Vertical (Al,Ga)N Nanowires to Realize the Flexible Ultraviolet Photodetector with High Ultraviolet/Visible Reject Ratio and Detectivity

et al. 2022

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Flexible ultraviolet (UV) photodetectors (PDs) can meet the growing demands and wide applications of next‐generation portable and lightweight optoelectronic devices. Herein, a flexible UV PD based on (Al,Ga)N nanowires (NWs) is proposed and successfully fabricated by numerical and experimental approaches, which have high UV/visible reject ratio (1.5 × 104) and detectivity (8 × 1010 Jones). To accelerate the carrier transport and enhance the response, the top–down–top current pathway is demonstrated by introducing interdigitated electrodes and graphene. The UV/visible reject ratio of the flexible PD can be enhanced over 40 times by removing epitaxial silicon substrate to eliminate the corresponding visible response, leading to an excellent detection selectivity. By numerical simulations, the electric field intensities of the NWs are comparative in the unbending and bending states. After −120° bending, the PD performance remains quite stable. Under different bending states, the maximum variation of different response time can be kept within 0.15 s. According to the experimental data, the barrier height is essentially unchanged under different bending states, which should be a key factor contributing to the outstanding stability of the PD.

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“…Speci cally, CDs with P3HT are widely studied in organic solar cells (OSC) to improve conversion e ciency through increased electron transfer [21][22][23][24]. P3HT is studied as an electron donor and CDs as an acceptor material in organic solar cells, which improve charge separation [7,24]. Cui et al [24] reported that the graphitic structured blue greenish C-CQDs synthesized using CVD method increased the e ciency of P3HT:PC61BM solar cells by 11%.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Broadband Absorption and Photocurrent Generation in Carbon Dots via P3HT Integration

Gopi,

Ponnusamy

2024

Preprint

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The growing interest in carbon dots (CDs) arises from their diverse applications and unique properties. This study addresses challenges in CDs for photodetector (PD) applications, specifically surface defects and trap states hindering efficient charge transport. CDs/P3HT composites were prepared to overcome these issues by incorporating CDs in a poly(3-hexylthiophene) (P3HT) matrix. Broad absorption in spectroscopic characterization revealed its utility in fabricating a broadband PD. The CDs/P3HT PD displays a remarkable broadband photoresponse, spanning both UV and visible regions. The CDs and P3HT are effectively combined via non-covalent π-π interactions constituted by their conjugated systems. The π-π interaction increases electron delocalization and facilitates efficient charge transfer due to band alignment at the junction interface. Hence, fabricated CDs/P3HT PD demonstrated enhanced photocurrent compared to pure CDs, exhibiting high responsivity of 6.12×10-3 AW-1 and detectivity of 0.69×109 Jones. This study highlights the potential of CD/P3HT composites for broadband photodetector applications with enhanced photoelectric conversion.

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Green synthesis of graphene quantum dots and the dual application of graphene quantum dots-decorated flexible MSM p-type ZnO device as UV photodetector and piezotronic generator

Cited by 17 publications

References 30 publications

Nature of photoexcited states in ZnO-embedded graphene quantum dots

Nature of photoexcited states in ZnO-embedded graphene quantum dots

Detached Vertical (Al,Ga)N Nanowires to Realize the Flexible Ultraviolet Photodetector with High Ultraviolet/Visible Reject Ratio and Detectivity

Enhancing Broadband Absorption and Photocurrent Generation in Carbon Dots via P3HT Integration

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