Gautam Gupta

7Manish Chhowalla
6Rajesh Kappera
4Aditya D Mohite
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Ultrathin molybdenum disulphide (MoS2) has emerged as an interesting layered semiconductor because of its finite energy bandgap and the absence of dangling bonds. However, metals deposited on the semiconducting 2H phase usually form high-resistance (0.7 kΩ μm-10 kΩ μm) contacts, leading to Schottky-limited transport. In this study, we demonstrate that the(More)
The polyhedral model is now a well established and effective formalism for program optimization and parallelization. However, finding optimal transformations is a long-standing open problem. It is therefore important to develop tools that, rather than following prede-fined optimization criteria, allow practitioners to explore different choices through(More)
The polyhedral model is a well developed formalism and has been extensively used in a variety of contexts viz. the automatic parallelization of loop programs, program verification, locality, hardware generationand more recently, in the automatic reduction of asymptotic program complexity. Such analyses and transformations rely on certain closure properties.(More)
  • Sidong Lei, Liehui Ge, Sina Najmaei, Antony George, Rajesh Kappera, Jun Lou +6 others
  • 2014
Atomic layers of two-dimensional (2D) materials have recently been the focus of extensive research. This follows from the footsteps of graphene, which has shown great potential for ultrathin optoelectronic devices. In this paper, we present a comprehensive study on the synthesis, characterization, and thin film photodetector application of atomic layers of(More)
Many computations can be modeled with systems of affine recurrence equations (SAREs) over polyhedral domains. We study the problem of scheduling individual computations of an SARE in the presence of reductions i.e., operations specifying the accumulation of a set of values to produce a single value. Reductions involve a commutative and associative operator(More)
  • Rajesh Kappera, Damien Voiry, Sibel Ebru Yalcin, Wesley Jen, Muharrem Acerce, Sol Torrel +9 others
  • 2014
Articles you may be interested in Separation of interlayer resistance in multilayer MoS2 field-effect transistors Appl. Growth-substrate induced performance degradation in chemically synthesized monolayer MoS2 field effect transistors Appl. Electrical performance of monolayer MoS2 field-effect transistors prepared by chemical vapor deposition Appl.(More)
  • Hisato Yamaguchi, Jean-Christophe Blancon, Rajesh Kappera, Sidong Lei, Sina Najmaei, Benjamin D Mangum +6 others
  • 2015
A fundamental understanding of the intrinsic optoelectronic properties of atomically thin transition-metal dichalcogenides (TMDs) is crucial for its integration into high performance semiconductor devices. Here, we investigate the transport properties of chemical vapor deposition (CVD) grown monolayer molybdenum disulfide (MoS2) under photoexcitation using(More)
  • Wanyi Nie, Jean-Christophe Blancon, Amanda J. Neukirch, Kannatassen Appavoo, Hsinhan Tsai, Manish Chhowalla +8 others
  • 2016
Solution-processed organometallic perovskite solar cells have emerged as one of the most promising thin-film photovoltaic technology. However, a key challenge is their lack of stability over prolonged solar irradiation. Few studies have investigated the effect of light soaking on hybrid perovskites and have attributed the degradation in the optoelectronic(More)
  • Dustin R. Cummins, Ulises Martinez, Andriy Sherehiy, Rajesh Kappera, Alejandro Martinez-Garcia, Roland K. Schulze +9 others
  • 2016
Hydrogen evolution reaction is catalysed efficiently with precious metals, such as platinum; however, transition metal dichalcogenides have recently emerged as a promising class of materials for electrocatalysis, but these materials still have low activity and durability when compared with precious metals. Here we report a simple one-step scalable approach,(More)