• A M Hermann

      Articles written in Pramana – Journal of Physics

    • Electro-optical characterization and analysis of CuPc-based solar cells with high photovoltage

      V P Singh R S Singh A M Hermann

      More Details Abstract Fulltext PDF

      Organic solar cells using the CuPc and PTCBI semiconductor layers were studied. A high open circuit voltage of 1.15 V was obtained in a device with ITO/PEDOT:PSS/CuPc (15 nm)/PTCBI (7 nm)/Al structure. Results were interpreted in terms of a modified CuPc-Al Schottky diode for the thin PTCBI case and a CuPc-PTCBI heterojunction for the thick PTCBI case. Also, the formation of a thin aluminum oxide layer under the aluminum electrode was postulated. This layer has a beneficial aspect wherein shunting losses are reduced and a high photovoltage is enabled. However, it adds greatly to the series resistance to a point where the short circuit current density is reduced. CuPc Schottky diodes with an ITO/PEDOT:PSS/CuPc/Al structure yielded a high Voc of 900 mV for a CuPc layer of thickness 140 nm. The Voc increased with increase in CuPc layer thickness.

    • Current nanoscience and nanoengineering at the Center for Nanoscale Science and Engineering

      A M Hermann R S Singh V P Singh

      More Details Abstract Fulltext PDF

      The Center for Nanoscale Science and Engineering (CeNSE) at the University of Kentucky is a multidisciplinary group of faculty, students, and staff, with a shared vision and cutting-edge research facilities to study and develop materials and devices at the nanoscale.

      Current research projects at CeNSE span a number of diverse nanoscience thrusts in bio-engineering and medicine (nanosensors and nanoelectrodes, nanoparticle-based drug delivery), electronics (nanolithography, molecular electronics, nanotube FETs), nanotemplates for electronics and gas sensors (functionalization of carbon nanotubes, aligned carbon nanotube structures for gate-keeping, e-beam lithography with nanoscale precision), and nano-optoelectronics (nanoscale photonics for laser communications, quantum confinement in photovoltaic devices, and nanostructured displays).

      This paper provides glimpses of this research and future directions.

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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