Search results for: Jagannath Panigrahi

Items from 1 to 8 out of 8 results

article

Effect of Gas Flow Rate in PECVD of Amorphous Silicon Thin Films for Interface Passivation of Silicon Heterojunction Solar Cells

Ashutosh Pandey, Shrestha Bhattacharya, Jagannath Panigrahi, Sourav Mandal, more

physica status solidi (a) > 219 > 16 > n/a - n/a

Precursor gas flow rate variation (30–80 sccm) in the plasma‐enhanced chemical vapor deposition (PECVD) process of intrinsic a‐Si:H layer deposition using SiH₄/H₂ (equal ratio) plasma is explored and its effect on the i‐a‐Si:H/c‐Si interface passivation is investigated. A window of intermediate gas flow rates is determined for good quality surface passivation of n‐type c‐Si. Maximum effective minority...

article

Atomic layer deposited dielectric and/or semiconducting oxide bilayers for crystalline silicon surface passivation

Jagannath Panigrahi, Vandana Panwar, Rajbir Singh, P.K. Singh

Energy Procedia > 2017 > 124 > C > 302-306

This study deals with the silicon surface passivation by thermal ALD deposited oxides bilayer of HfO₂/Al₂O₃ as well as single layer of Al rich ZnO (AZO) in the form of ZnO and Al₂O₃ multilayers. A significant improvement in the effective minority carrier lifetime (τ_eff ~ 1.3ms) of n-type Si is observed after deposition of HfO₂(5nm)/Al₂O₃(5nm)/Si compared to that of the single layer Al₂O₃(10nm)/Si...

article

Impedance spectroscopy of crystalline silicon solar cell: Observation of negative capacitance

Jagannath Panigrahi, Vandana, Rajbir Singh, Neha Batra, more

Solar Energy > 2016 > 136 > C > 412-420

The knowledge of ac parameters of solar cells/arrays is important for designing of high performance power conditioning circuits to match the input at operating conditions. A systematic study of crystalline silicon solar cells is done using impedance spectroscopy under forward bias conditions and at different illumination levels. A “negative capacitance” behaviour is observed in the low frequency region...

chapter

Study of Al₂O₃/ZnO multilayers for silicon surface passivation

Jagannath Panigrahi, Vandana, Rajbir Singh, P.K. Singh

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) > 2964 - 2966

2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

A good surface passivation of p-type si surface is achieved by Al₂O₃/ZnO multilayers deposited using atomic layer deposition. The effective surface recombination velocity (S_eff) less than 20cm/s is realized with symmetrically deposited multi-layers on p-Si. In the process a single supercycle consists of one al2o3 and 15 zno layers that can be repeated to get desired thickness of the stack. Subsequently,...

article

Silicon surface passivation using thin HfO2 films by atomic layer deposition

Jhuma Gope, Vandana, Neha Batra, Jagannath Panigrahi, more

Applied Surface Science > 2015 > 357 > PA > 635-642

Hafnium oxide (HfO₂) is a potential material for equivalent oxide thickness (EOT) scaling in microelectronics; however, its surface passivation properties particularly on silicon are not well explored. This paper reports investigation on passivation properties of thermally deposited thin HfO₂ films by atomic layer deposition system (ALD) on silicon surface. As-deposited pristine film (∼8nm) shows...

article

Synthesis of nano ZnO thin film on Al foil by rf glow discharge plasma and its effect on E. coli and P. aeruginosa

Jagannath Panigrahi, Bijan B. Nayak, Debadhyan Behera, Umakanta Subudhi, more

Applied Physics A > 2012 > 108 > 3 > 577-585

Nano ZnO thin films were deposited on thin Al foils by a rf glow discharge plasma method in which sublimed zinc acetate vapor (precursor) reacted with oxygen plasma inside a low-pressure reactor. The films were microstructurally characterized using XRD, TEM, FESEM, optical reflectance and micro-Raman spectroscopy methods. In view of the good scope of ZnO coating in food packaging, the antibacterial...

article

Radio frequency plasma enhanced chemical vapor based ZnO thin film deposition on glass substrate: A novel approach towards antibacterial agent

Jagannath Panigrahi, Debadhyan Behera, Ipsita Mohanty, Umakanta Subudhi, more

Applied Surface Science > 2011 > 258 > 1 > 304-311

In the present study, the structural, optical and antibacterial properties of ZnO thin films are reported. ZnO thin films are deposited on borosilicate glass substrates by radio frequency plasma enhanced chemical vapor deposition (PECVD) using oxygen as process gas. The crystallinity of the deposited films is improved upon annealing at 450°C in air for 1.5h and the polycrystalline nature of the films...

article

Probing the effect of nitrogen gas on electrical conduction phenomena of ZnO and Cu-doped ZnO thin films prepared by spray pyrolysis

Debadhyan Behera, Jagannath Panigrahi, Bhabani S. Acharya

Ionics > 2011 > 17 > 8 > 741-749

Zinc oxide (ZnO) and Cu-doped ZnO (CZO) thin films were prepared on borosilicate glass substrates by spray pyrolysis technique. The X-ray diffraction study revealed that Cu doping caused a reduction in crystallite size. AFM study showed an increase in roughness with doping. This is attributed to the aggregation of particles to form clusters. From transmission electron microscopy analysis, the particle...

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INFONA - science communication portal

Search results for: Jagannath Panigrahi

Effect of Gas Flow Rate in PECVD of Amorphous Silicon Thin Films for Interface Passivation of Silicon Heterojunction Solar Cells

Atomic layer deposited dielectric and/or semiconducting oxide bilayers for crystalline silicon surface passivation

Impedance spectroscopy of crystalline silicon solar cell: Observation of negative capacitance

Study of Al₂O₃/ZnO multilayers for silicon surface passivation

Silicon surface passivation using thin HfO2 films by atomic layer deposition

Synthesis of nano ZnO thin film on Al foil by rf glow discharge plasma and its effect on E. coli and P. aeruginosa

Radio frequency plasma enhanced chemical vapor based ZnO thin film deposition on glass substrate: A novel approach towards antibacterial agent

Probing the effect of nitrogen gas on electrical conduction phenomena of ZnO and Cu-doped ZnO thin films prepared by spray pyrolysis

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