Journal ArticleDOI
Fabrication and properties of a high-performance chlorine doped graphene quantum dot based photovoltaic detector
Jianhong Zhao,Libin Tang,Jinzhong Xiang,Rongbin Ji,Yanbo Hu,Jun Yuan,Jun Zhao,Yunjian Tai,Yuhua Cai +8 more
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TLDR
In this paper, a chlorine doped GQD (Cl-GQD) based photovoltaic photodetectors have been fabricated using a solution process, and it was found that the presence of GQDs can significantly enhance the performance of the device.Abstract:
Functionalized graphene quantum dot (GQD) based materials play an important role in the development of high-performance, low-cost, large-area optoelectronic devices. The progress, however, is impeded by the poor understanding of the physical mechanism for GQDs in these devices. In this paper, chlorine doped GQD (Cl-GQD) based photovoltaic photodetectors have been fabricated using a solution process, and it was found that the presence of Cl-GQDs can significantly enhance the performance of the device. The improved performance of Cl-GQD based devices has been investigated by systematically studying the structural, morphological, optical, electrical, electrochemical and photoelectrical properties. The important photovoltaic detectors parameters such as the saturation current densities (J0), barrier heights (Φb), built-in potentials (Vbi), carrier concentrations (N) and depletion layer widths (Wd) have been calculated and discussed by studying the I–V and C–V characteristics under different illuminations. The frequency dependent capacitance and conductance have also been discussed. The results provide guidance for developing high-performance graphene based optoelectronic devices.read more
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Journal ArticleDOI
Graphene quantum dots from chemistry to applications
TL;DR: GQDs are considered new kind of quantum dots (QDs), as they are chemically and physically stable because of its intrinsic inert carbon property as discussed by the authors, and they are environmentally friendly due to its non-toxic and biologically inert properties.
Journal ArticleDOI
Chemically doped fluorescent carbon and graphene quantum dots for bioimaging, sensor, catalytic and photoelectronic applications
Yan Du,Shaojun Guo +1 more
TL;DR: This review will give new insights into how to use different synthetic methods for tuning the structure of DFCDs, understanding the correlation between the doping and properties, and achieving new applications.
Journal ArticleDOI
Quantum dots derived from two-dimensional materials and their applications for catalysis and energy
TL;DR: The synthesis methods and the properties of quantum dots derived from the atomically-thin two-dimensional sheets are discussed and their applications in electrocatalysis, photocatalysis, supercapacitors, batteries, and photovoltaics are emphasized.
Journal ArticleDOI
Facile synthesis of sulfur-doped graphene quantum dots as fluorescent sensing probes for Ag+ ions detection
TL;DR: Sulfur-doped graphene quantum dots (S-GQDs) with bright blue emission have been prepared by a facile one-pot hydrothermal treatment as mentioned in this paper.
Journal ArticleDOI
Facile and Highly Effective Synthesis of Controllable Lattice Sulfur-Doped Graphene Quantum Dots via Hydrothermal Treatment of Durian.
Gang Wang,Qinglei Guo,Qinglei Guo,Da Chen,Zhiduo Liu,Xiaohu Zheng,Anli Xu,Siwei Yang,Guqiao Ding +8 more
TL;DR: This work proposed a facile and effective strategy to prepare controllable sulfur (S) doping in GQDs, occurring in a lattice substitution manner, by hydrothermal treatment of durian with platinum catalyst.
References
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The Band Theory of Graphite
TL;DR: In this paper, the structure of the electronic energy bands and Brillouin zones for graphite was developed using the "tight binding" approximation, and it was found that graphite is a semi-conductor with zero activation energy, but they are created at higher temperatures by excitation to a band contiguous to the highest one which is normally filled.
Journal ArticleDOI
Ultrafast graphene photodetector
TL;DR: This work demonstrates ultrafast transistor-based photodetectors made from single- and few-layer graphene that do not degrade for optical intensity modulations up to 40 GHz and suggests that the intrinsic bandwidth may exceed 500 GHz.
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