Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Graphene Schottky Varactor Diodes for High-Performance Photodetection
Adi Levi*1,2, Moshe Kirshner*1,2, Ofer Sinai1,2, Eldad Peretz1,2, Ohad Meshulam1,2, Arnab Ghosh1,2, Noam Gotlib1,2, Chen Stern1,2, Shaofan Yuan3, Fengnian Xia3, and Doron Naveh1,2†
1 Faculty of Engineering, Bar-Ilan University, Ramat-Gan, Israel, 52900
2 Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, Israel, 52900
3 Department of Electrical Engineering, Yale University, New Haven CT 06511, USA
* These authors contributed equally to this work
† Corresponding author: doron.naveh@biu.ac.il
ABSTRACT
Over the past decade graphene devices have inspired the progress of future electronic and optoelectronic technologies. The unique combination of fast carrier dynamics and intrinsic quantum capacitance of graphene is a fertile ground for implementing novel device architectures. Here, we report on a novel device architecture comprising graphene Schottky diode varactors, and assess the potential applications of this type of new devices in optoelectronics. We show that graphene varactor diodes exhibit significant advantages compared with existing graphene photodetectors including elimination of high dark currents and enhancement of the external quantum efficiency (EQE). Our devices demonstrate a large photoconductive gain and EQE of up to 37%, fast photoresponse and low leakage currents at room temperature.
DN would like to thank the Israel Science Foundation for providing support for this research with grant No. 1055/15 and to the Israel Ministry of Defense for providing financial support to this grant with contract No. 16121. The authors would like to thank Dr. Gabriel Zeltzer and to Dr. Vlada Artel and Dr. Koushik Majhi for useful advice and discussions.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.