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Your search keyword '"P.C. Reshmi Varma"' showing total 4 results
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4 results on '"P.C. Reshmi Varma"'

1. Low-Dimensional Perovskites

Author

P.C. Reshmi Varma

Subjects
Materials science, business.industry, Photovoltaic system, Optoelectronics, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 0210 nano-technology, business, 01 natural sciences, 0104 chemical sciences, Perovskite (structure)
Abstract

Low-dimensional (LD) perovskite materials possess unique physical and optical properties, which makes them promising candidates for optoelectronic and photovoltaic applications. Compared to their three-dimensional counterpart, the optical and electrical properties of the LD perovskites can be tuned by controlling their structure and size. Here, we discuss the structural and physical properties along with different types of the synthesis method of the LD perovskites. We also demonstrate the different applications of the LD perovskite material in optoelectronic and photovoltaic devices.

Published
2018
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2. List of Contributors

Author

Javeed Akhtar, Muhammad Aamir, Diptonil Banerjee, Gabrielle Berns, Madhulika Bhati, Kalyan Kumar Chattopadhyay, Jayeeta Chattopadhyay, Abinash Das, Christie L.C. Ellis, Michael J. Heben, Hamza Javaid, Ramya Krishna, Suresh Maniarasu, Vishesh Manjunath, Balamurugan Manoharan, P. Mathan Kumar, Minu Mohan, Ranjith G. Nair, Tara Sankar Pathak, Adam B. Phillips, Radhika Rai, Vidya Raj, Easwaramoorthi Ramasamy, P.C. Reshmi Varma, Sarat Kumar Sahoo, Lalu Seban, Sakthivel Shanmugasundaram, Muhammad Sher, Narendiran Sivakumar, Emily Smith, Zhaoning Song, Ganapathy Veerappan, Dhandapani Venkataraman, and Suneth C. Watthage

Published
2018
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3. Squaraine based solution processed inverted bulk heterojunction solar cells processed in air

Author

Manoj A. G. Namboothiry and P.C. Reshmi Varma

Subjects
Photocurrent, Photon, Materials science, business.industry, Energy conversion efficiency, Photovoltaic system, General Physics and Astronomy, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Polymer solar cell, 0104 chemical sciences, Solution processed, Light source, Optoelectronics, Physical and Theoretical Chemistry, 0210 nano-technology, business, Intensity (heat transfer)
Abstract

Inverted bulk heterojunction solar cells based on low temperature solution processed squaraine (SQ) and [6,6]-phenyl C71 butyric acid methyl-ester (PC71BM) with varying blend ratios were made in air. An optimized bulk heterojunction device of SQ and PC71BM (with a blend ratio of 1 : 6) showed a power conversion efficiency (PCE) of 2.45% with an incident photon to current conversion efficiency of 65% at 680 nm and a spectral window extending to the NIR region. The devices also showed an enhanced PCE value of 4.12% upon continuous illumination from an AM1.5G light source of intensity 1 Sun. The intensity dependent photocurrent studies showed a monomolecular recombination mechanism in the photovoltaic device performance. The device stored in air showed reasonable stability for a period of one month.

Published
2015

4. Enhancement in Photovoltaic Properties of Plasmonic Nanostructures Incorporated Organic Solar Cells Processed in Air Using P3HT:PCBM as a Model Active Layer

Author

C. Ram Kumar, Manoj A. G. Namboothiry, P.C. Reshmi Varma, K. Vivek, and P. M. Aneesh

Subjects
P3HT:PCBM, lcsh:Applied optics. Photonics, Metal oxide interfacial layer, Materials science, Organic solar cell, Organic solar cells, business.industry, Bulk heterojunction, Photovoltaic system, Energy conversion efficiency, lcsh:TA1501-1820, Nanoparticle, Polymer solar cell, Active layer, Electrode, Plasmonics, Optoelectronics, business, Short circuit
Abstract

The effect of incorporation of plasmonicgold (Au) nanoparticle at the interface between trans-parent front electrode and hole transporting layer ofmolybdenum trioxide is studied using bulk hetero-junction organic photovoltaic cells (OPVs) of poly-3-hexylthiophene and phenyl-C 61 -butyric acid methyl es-ter (P3HT:PC 61 BM) fabricated in ambient air conditionas a model system. The current-voltage measurement ofITO/MoO 3 /P3HT:PC 61 BM/Al and Au incorporated OPVsunder AM1.5G light of intensity 1 Sun showed 16% in-crease in short circuit current density (J SC ) and a 25%improvement in power conversion efficiency (PCE) withtheincorporationofAunanoparticles.Theexternalquan-tumefficiency(EQE)measurementshowedvaluesvaryingfrom 40% to 60% over a wavelength range 350 nm to700nmwithEQEenhancementoverabroadspectralwin-dow.ScanningelectronmicroscopestudieswereusedtostudythemorphologyoftheAunanoparticlesmade. Keywords: Organic solar cells, Bulk heterojunction,P3HT:PCBM,Metaloxideinterfaciallayer,Plasmonics

Published
2015
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