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Jyothi, I.,Seo, M.W.,Janardhanam, V.,Shim, K.H.,Lee, Y.B.,Ahn, K.S.,Choi, C.J. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.556 No.-
We fabricated Er-silicide (ErSi<SUB>1.7</SUB>) Schottky contacts to strained Si-on-insulator (sSOI) with a strain level of 0.77% and investigated their electrical properties in the temperature range of 225-400K. The Schottky parameters such as the barrier height, ideality factor, and series resistance were found to strongly depend on temperature. Barrier height and ideality factor were found to decrease and increase, respectively, with decreasing temperature. The series resistance gradually increased with decreasing temperature. A discrepancy between the Schottky barrier heights calculated from the forward current-voltage (I-V) characteristics and Norde's method indicated a deviation from the ideal thermionic emission of ErSi<SUB>1.7</SUB>/sSOI Schottky diode. The lateral inhomogeneity of the Schottky barrier and potential fluctuations at the interface between ErSi<SUB>1.7</SUB> and sSOI could be a main cause of the difference between the calculated and theoretical values of the Richardson constant. On the basis of a thermionic emission mechanism with a Gaussian distribution of the barrier heights, temperature dependency of ErSi<SUB>1.7</SUB> Schottky contact to sSOI was explained in terms of the barrier height inhomogeneities at the interface.
Microstructural and electrical properties of Cu-germanide formed on p-type Ge wafer
Jyothi, I.,Janardhanam, V.,Hwang, J.Y.,Lee, W.K.,Park, Y.C.,Kang, H.C.,Lee, S.N.,Choi, C.J. Elsevier Sequoia 2016 JOURNAL OF ALLOYS AND COMPOUNDS Vol.655 No.-
We have investigated the microstructural and electrical properties of Cu-germanides formed by the deposition of Cu on Ge wafer, followed by rapid thermal annealing (RTA) process at the temperatures in the range of 300-700 <SUP>o</SUP>C. Regardless of RTA temperature, the Cu<SUB>3</SUB>Ge was the only phase formed as a result of solid-state reaction between Cu and Ge driven by RTA process. The RTA temperature dependency of specific contact resistivity of Cu<SUB>3</SUB>Ge was explained in terms of its structural evolution caused by RTA process. The RTA process at 400 <SUP>o</SUP>C led to the formation of Cu<SUB>3</SUB>Ge film having highly uniform surface and interface morphologies, allowing the minimum value of the specific contact resistivity. The samples annealed above 500 <SUP>o</SUP>C underwent the severe structural degradation of Cu<SUB>3</SUB>Ge, resulting in a rapid increase in the specific contact resistivity. After RTA at 700 <SUP>o</SUP>C, pyramidal Cu<SUB>3</SUB>Ge islands standing on a corner, distributed along Ge <110> direction were formed with epitaxial relationship on underlying Ge.
Fermi-level depinning in germanium Schottky junction using nitrogen plasma treatment
Janardhanam, V.,Yun, H.-J.,Jyothi, I.,Lee, H.-K.,Lee, S.-N.,Won, J.,Choi, C.-J. Institution of Electrical Engineers 2018 Electronics letters Vol.54 No.14
<P>Fermi-level depinning in germanium (Ge) through nitrogen (N-2) plasma treatment is demonstrated. The Ge surface was exposed to N-2 plasma for 1 min without heat treatment, resulting in the formation of 2.5 nm-thick GeOxNy layer with uniform surface and interface morphologies. Ohmic and Schottky behaviours were obtained for Al contacts to N-2 plasma-treated n- and p-type Ge with barrier heights of 0.09 and 0.40 eV, respectively. Fermi-level depinning could be attributed to the reduction in interface states caused by the passivation of Ge surface by highly uniform GeOxNy layer.</P>
M. V. Chandrakala,V. G. Maribashetty,C. A. Aftab Ahamed,H. K. Jyothi 한국잠사학회 2009 International Journal of Industrial Entomology Vol.18 No.2
Sericulturists in the vicinity of Bangalore city irrigate their mulberry gardens with Vrishabhavathy stream water, which is polluted with domestic and industrial wastes from the city. To investigate the effect of pollutants on silkworm crops, a detailed field survey was conducted to study the cocoon yield pattern of the crops raised on mulberry irrigated with wastewater as against irrigation by bore/open wells. The villages along the stream were grouped into five test batches at about a distance of 5~8 km from each other. The seasonal yield data with relevant information were collected through questionnaires from 117 rearers using stream water and 35 rearers using bore/open wells, the latter serving as control group. The average yield for 100 layings was 46 to 57 kg in the control group whereas in test groups, it ranged between 34 to 51 kg in the first test group and 22 to 38 kg in the rest. The difference in yield was 9~19 kg depending on the season between control and test batches. In summer, this difference was higher, with high co-efficient of variation in test groups (33~52%). Further, water, soil and leaf samples were collected from selected rearers and were analyzed for zinc, copper, iron, lead and nickel. Results indicated significantly higher contents of these metals in samples from gardens using wastewater when compared control samples. Significantly (p<0.05 & p<0.01)) higher levels of zinc (24~122 ppm) and iron (208~683 ppm) were noticed in mulberry leaves during summer followed by winter and rainy season. The significance of high content of heavy metals in mulberry leaves and cocoon yield pattern of this area in relation to the quality of irrigation water is discussed.
Chandrakala, M.V.,Maribashetty, V.G.,Aftab Ahamed, C.A.,Jyothi, H.K. Korean Society of Sericultural Science 2009 International Journal of Industrial Entomology Vol.18 No.2
Sericulturists in the vicinity of Bangalore city irrigate their mulberry gardens with Vrishabhavathy stream water, which is polluted with domestic and industrial wastes from the city. To investigate the effect of pollutants on silkworm crops, a detailed field survey was conducted to study the cocoon yield pattern of the crops raised on mulberry irrigated with wastewater as against irrigation by bore/open wells. The villages along the stream were grouped into five test batches at about a distance of $5{\sim}8$ km from each other. The seasonal yield data with relevant information were collected through questionnaires from 117 rearers using stream water and 35 rearers using bore/open wells, the latter serving as control group. The average yield for 100 layings was 46 to 57 kg in the control group whereas in test groups, it ranged between 34 to 51 kg in the first test group and 22 to 38 kg in the rest. The difference in yield was $9{\sim}19$ kg depending on the season between control and test batches. In summer, this difference was higher, with high co-efficient of variation in test groups ($33{\sim}52$%). Further, water, soil and leaf samples were collected from selected rearers and were analyzed for zinc, copper, iron, lead and nickel. Results indicated significantly higher contents of these metals in samples from gardens using wastewater when compared control samples. Significantly (p<0.05 & p<0.01)) higher levels of zinc ($24{\sim}122$ ppm) and iron ($208{\sim}683$ ppm) were noticed in mulberry leaves during summer followed by winter and rainy season. The significance of high content of heavy metals in mulberry leaves and cocoon yield pattern of this area in relation to the quality of irrigation water is discussed.
Sathian, Brijesh,Fazil, Abul,Sreedharan, Jayadevan,Pant, Sadip,Kakria, Anjali,Sharan, Krishna,Rajesh, E.,Vishrutha, K.V.,Shetty, Soumya B.,Shahnavaz, Shameema,Rao, Jyothi H.,Marakala, Vijaya Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3
Background: To estimate the numbers and trends in cervix cancer cases visiting the Radiotherapy Department at Manipal Teaching Hospital, Pokhara, Nepal, statistical modelling from retrospective data was applied. Materials and Methods: A retrospective study was carried out on data for a total of 159 patients treated for cervix cancer at Manipal Teaching Hospital, Pokhara, Nepal, between $28^{th}$ September 2000 and $31^{st}$ December 2008. Theoretical statistics were used for statistical modelling and forecasting. Results: Using curve fitting method, Linear, Logarithmic, Inverse, Quadratic, Cubic, Compound, Power and Exponential growth models were validated. Including the constant term, none of the models fit the data well. Excluding the constant term, the cubic model demonstrated the best fit, with $R^2$=0.871 (p=0.004). In 2008, the observed and estimated numbers of cases were same (12). According to our model, 273 patients with cervical cancer are expected to visit the hospital in 2015. Conclusions: Our data predict a significant increase in cervical cancer cases in this region in the near future. This observation suggests the need for more focus and resource allocation on cervical cancer screening and treatment.