Firefly

Abstract

LGS is continuing its investigation of new methods for measuring the mobility within organic photovoltaics using a combination of magnetic resonance methods. The primary goal of our work is to understand carrier transport better within the complex environment of the bulk heterojuntion. In this second quarterly report, LGS in collaboration with Hunter College has completed work on baseline measurements of relaxation times for pentacene at various temperatures in order to determine optimal temperatures for measuring relaxation rate as a function of doping. We have also repeated these measurements on pentacene samples at 2 different doping levels, quantifying spin density using EPR spectroscopy and spin counting. As predicted by our model, relaxation enhancement at 300MHz is a somewhat weak effect, and we anticipate a stronger effect at lower field.

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Document Details

Document Type
Technical Report
Publication Date
May 29, 2012
Accession Number
ADA562241

Entities

People

  • Ashok Maliakal

Tags

DTIC Thesaurus Topics

  • Chemical Shifts
  • Coefficients
  • Diffusion Coefficient
  • Environment
  • Equations
  • Films
  • Low Temperature
  • Magnetic Resonance
  • Materials
  • Measurement
  • Mixtures
  • Nuclear Magnetic Resonance
  • Quantum Properties
  • Relaxation Time
  • Resonance
  • Saturation
  • Spectra

Readers

  • Computational Modeling and Simulation
  • Materials Science and Engineering.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.