15 Result(s)

Article

Effect of compositionally co-related and orderly varying indium molar content on the performance of In_0.15Ga_0.85N/In_xGa_(1−x)N laser diode structure

In this paper, increasing indium composition ‘x’ in quantum barriers of In_0.15Ga_0.85N/In_xGa_(1-x)N based laser diode structure is proposed. The paper analyses the effect of molar composition of indium in quantum b...

Kashish Sapra, Indrani Mazumder, Kamal Lohani… in Optical and Quantum Electronics (2024)

Article

Effects of chirped barrier thickness on InGaN/GaN and InGaN/InGaN MQW LEDs

In this paper, we present the effect of chirped barrier on the optical properties of InGaN/GaN and InGaN/InGaN multi quantum wells (MQWs) based light-emitting diodes. It is observed that the chirped barrier co...

Indrani Mazumder, Kashish Sapra, Avinash Paliwal… in Indian Journal of Physics (2023)

Chapter and Conference Paper

Influence of High-K and Low-K Dielectrics on Drain Current of GaN HEMTs

This paper reports on the influence of high-k and low-k dielectric passivation on the drain current performance of GaN HEMTs. Four different dielectric materials, namely, SiN_x,

Shivanshu Mishra, Sandeep Dhakad… in Computational Mathematics, Nanoelectronics… (2021)

Article

Electrical and optical properties of InGaN/GaN MQWs light-emitting diodes with Ni/Au/ITO transparent p-contacts

In the present study, optical and electrical properties of e-beam deposited Ni/Au/ITO (1.5/1/50 nm) contacts on p-GaN are investigated and compared with conventional thin Ni/Au (5/5 nm) semitransparent p-conta...

Kuldip Singh, Ashok Chauhan, Manish Mathew, Rajesh Punia… in Indian Journal of Physics (2020)

Article

Effects on electrical and optical properties of InGaN/GaN MQWs light-emitting diodes using Ni/ITO transparent p-contacts on p-GaN

In the present study, optical and electrical properties of e-beam-deposited Ni/indium–tin oxide (5/50 nm) contacts are studied and compared with semi-transparent Ni/Au (5/5 nm) contacts. The normalized transmi...

Kuldip Singh, Ashok Chauhan, Manish Mathew, Rajesh Punia… in Journal of Optics (2019)

Article

Formation of non-alloyed Ti/Al/Ni/Au low-resistance ohmic contacts on reactively ion-etched n-type GaN by surface treatment for GaN light-emitting diodes applications

Ti/Al/Ni/Au (30/120/20/100 nm) non-alloyed ohmic contacts on reactively ion-etched n-GaN have been obtained by thermal annealing in N₂ + O₂ ambient prior to metal contacts deposition. After surface treatment, con...

Kuldip Singh, Ashok Chauhan, Manish Mathew, Rajesh Punia… in Applied Physics A (2018)

Chapter and Conference Paper

A Top-Down Approach for Fabrication of Nanorods on GaN-Based LEDs Using Self-Assembled Ni

In optoelectronic devices such as LEDs, LASERs, strain-induced piezoelectric polarization occurs in the structure because of large lattice mismatch occurs between sapphire substrate and GaN layers. This degrad...

Alka Jakhar, Manish Mathew, Ashok Chauhan… in Optical and Wireless Technologies (2018)

Article

Fabrication and characterization of GaN/InGaN MQW solar cells

In this paper, the p-GaN/i-GaN–InGaN (5MQW)/n-GaN solar cell with 33 % indium composition is grown, fabricated and characterized. The X-ray diffraction, atomic force microscopy and photoluminance are performed...

Pramila Mahala, Sumitra Singh, Suchandan Pal, Kuldip Singh… in Applied Physics A (2016)

Article

Isolated breast metastasis from granulosa cell tumor of the ovary

Granulosa cell tumors of the ovary are rare neoplasms arising from sex-cord stromal cells. These tumors usually present with stage I disease as they are frequently associated with hormonal effects. Only a smal...

Ashok Chauhan, Pushpa Dahiya, Harmeet Singh… in Archives of Gynecology and Obstetrics (2009)

Article

Fabrication and performance-analysis of a planar silica-based cascaded symmetric Y-branch 1 × 8 optical power splitter

Fabrication of a planar silica-based cascaded symmetric Y-branch 1 × 8 optical power splitter is described in this study. Post-fabrication, thorough analysis of device-performance is presented in terms of inse...

Suchandan Pal, Ashok Chauhan, Pawan Kumar, Mahendra Singh, Sona Das… in Journal of Optics (2009)

Article

Modulation of human immunodeficiency virus infection by anticonvulsant drugs

Patients with human immunodeficiency virus (HIV) infection often require treatment with anticonvulsants either for treatment of seizures or occasionally for pain control. In this study, the authors determined ...

Barry Robinson, Jadwiga Turchan, Caroline Anderson… in Journal of NeuroVirology (2006)

Article

Effects on synaptic activity in cultured hippocampal neurons by influenza A viral proteins

Certain viruses can infect neurons and cause persistent infections with restricted expression of viral proteins. To study the consequences of such viral proteins on synaptic functions, the effects of two influ...

Johan Brask, Ashok Chauhan, Russell H. Hill… in Journal of NeuroVirology (2005)

Article

Epidemiological evidence and molecular basis of interactions between HIV and JC virus

Joseph R. Berger, Ashok Chauhan, David Galey, Avi Nath in Journal of NeuroVirology (2001)