Journal ArticleDOI
High-performance Ge quantum dot decorated graphene/zinc-oxide heterostructure infrared photodetector.
Xiang Liu,Xiangbing Ji,Mingju Liu,Nianze Liu,Zhi Tao,Qing Dai,Lei Wei,Chi Li,Xiaobing Zhang,Baoping Wang +9 more
TLDR
A novel size-controllable germanium quantum dot (Ge QD) is synthesized and decorated onto reduced graphene oxide (RGO) fragments to overcome the low infrared (IR) photoresponses of pristine graphene and manifests great potential in the future application of graphene-based IR photodetector.Abstract:
A novel size-controllable germanium quantum dot (Ge QD) is synthesized and decorated onto reduced graphene oxide (RGO) fragments to overcome the low infrared (IR) photoresponses (∼0.1 A/W)13,14 of pristine graphene. With the integration of flexible substrate, monolayer graphene (MLG) electrode and n-type zinc oxide (ZnO), a high-performance QD-decorated-RGO/ZnO heterostructure infrared photodetector is reported in this study. The Ge QD-decorated-RGO hybrid photosensitive composite improves the responsivity (∼9.7 A/W, 1400 nm) in IR waveband without sacrificing the response speed (∼40 μs rise time and 90 μs recovery time). In addition, the effective barrier formed between graphene and ZnO interface restricts the dark current (∼1.4 nA, -3 V) to guarantee the relatively excellent rectifying behavior and high on/off ratio (∼10(3)) for this IR photodetector. With these superior inherent properties and micron-sized sensing active area, this photodetector manifests great potential in the future application of graphene-based IR photodetector.read more
Citations
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Journal ArticleDOI
An Overview of the Development of Flexible Sensors.
Su-Ting Han,Haiyan Peng,Qijun Sun,Shishir Venkatesh,Kam-Sing Chung,Siu Chuen Lau,Ye Zhou,Vellaisamy A. L. Roy +7 more
TL;DR: Recent studies on flexible sensors for biological analytes, ions, light, and pH are outlined, contemporary studies on device structure, materials, and fabrication methods for flexible sensors are discussed, and a market overview is provided.
Journal ArticleDOI
Contacts between Two- and Three-Dimensional Materials: Ohmic, Schottky, and p-n Heterojunctions.
Yang Xu,Cheng Cheng,Sichao Du,Jianyi Yang,Bin Yu,Jack K. Luo,Wen-Yan Yin,Er-Ping Li,Shurong Dong,Peide D. Ye,Xiangfeng Duan +10 more
TL;DR: This review investigates the experimental efforts in interfacing 2D layers with 3D materials and analyzes the properties of the heterojunctions formed between them, calling for careful reconsideration of the physical models describing the junction behavior.
Journal ArticleDOI
Enhancing the Photoelectric Performance of Photodetectors Based on Metal Oxide Semiconductors by Charge‐Carrier Engineering
TL;DR: In this paper, a review of the latest researches on enhancing the photoelectric performance of photodetectors based on metal oxide semiconductors via chargecarrier engineering is presented.
Journal ArticleDOI
Recent Progress of Heterojunction Ultraviolet Photodetectors: Materials, Integrations, and Applications
TL;DR: In this article, the fundamental components of heterojunctions including UV response semiconductors and other materials functionalized with unique effects are discussed, and several applications based on heterojunction/heterostructure UV PDs are discussed.
Journal ArticleDOI
Graphene Hybrid Structures for Integrated and Flexible Optoelectronics
Xiaoqing Chen,Xiaoqing Chen,Khurram Shehzad,Li Gao,Mingsheng Long,Hui Guo,Shuchao Qin,Xiaomu Wang,Fengqiu Wang,Yi Shi,Weida Hu,Yang Xu,Xinran Wang +12 more
TL;DR: Recently, integration of Gr with silicon (Si) complementary metal-oxide-semiconductor (CMOS) circuits, the human body, and soft tissues is successfully demonstrated, opening promising opportunities for wearable sensors and biomedical electronics.
References
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Journal ArticleDOI
Quantifying defects in graphene via Raman spectroscopy at different excitation energies
Luiz Gustavo Cançado,Ado Jorio,E. H. Martins Ferreira,Fernando Stavale,Carlos A. Achete,Rodrigo B. Capaz,Marcus V. O. Moutinho,Antonio Lombardo,Tero S. Kulmala,Andrea C. Ferrari +9 more
TL;DR: It is found that the ratio between the D and G peak intensities, for a given defect density, strongly depends on the laser excitation energy, and a simple equation for the determination of the point defect density in graphene via Raman spectroscopy is presented.
Journal ArticleDOI
Quantifying defects in graphene via Raman spectroscopy at different excitation energies.
Luiz Gustavo Cançado,Ado Jorio,E. H. Martins Ferreira,Fernando Stavale,Carlos A. Achete,Rodrigo B. Capaz,Marcus V. O. Moutinho,Antonio Lombardo,Tero S. Kulmala,Andrea C. Ferrari +9 more
TL;DR: In this paper, a Raman study of Ar+-bombarded graphene samples with increasing ion doses was conducted and it was shown that the ratio between the D and G peak intensities strongly depends on the laser excitation energy.
Journal ArticleDOI
Hybrid graphene-quantum dot phototransistors with ultrahigh gain
Gerasimos Konstantatos,Michela Badioli,Louis Gaudreau,Johann Osmond,Maria Bernechea,F. Pelayo García de Arquer,Fabio Gatti,Frank H. L. Koppens +7 more
TL;DR: A gain of ∼10(8) electrons per photon and a responsivity of ∼ 10(7) A W(-1) in a hybrid photodetector that consists of monolayer or bilayer graphene covered with a thin film of colloidal quantum dots is demonstrated.
Journal ArticleDOI
All-optical control of light on a silicon chip
TL;DR: The experimental demonstration of fast all-optical switching on silicon using highly light-confining structures to enhance the sensitivity of light to small changes in refractive index and confirm the recent theoretical prediction of efficient optical switching in silicon using resonant structures.
Posted Content
Hybrid graphene-quantum dot phototransistors with ultrahigh gain
Gerasimos Konstantatos,Michela Badioli,Louis Gaudreau,Johann Osmond,Maria Bernechea,F. Pelayo García de Arquer,Fabio Gatti,Frank H. L. Koppens +7 more
TL;DR: In this article, the authors exploit the strong light absorption in quantum dots and the two-dimensionality and high mobility of graphene to merge these materials into a hybrid system for photodetection with extremely high sensitivity.