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Title: Measuring charge carrier mobility in photovoltaic devices with micron-scale resolution

We present a charge-extraction technique, micron-scale charge extraction by linearly increasing voltage, which enables simultaneous spatially resolved measurements of charge carrier mobility and photocurrent in thin-film photovoltaic devices with micron-scale resolution. An intensity-modulated laser with beam diameter near the optical diffraction limit is scanned over the device, while a linear voltage ramp in reverse bias is applied at each position of illumination. We calculate the majority carrier mobility, photocurrent, and number of photogenerated charge carriers from the resulting current transient. We demonstrate this technique on an organic photovoltaic device, but it is applicable to a wide range of photovoltaic materials.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [2]
  1. Sustainable Energy Technologies Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22395777
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARRIER MOBILITY; CHARGE CARRIERS; DIFFRACTION; ELECTRIC POTENTIAL; EXTRACTION; ILLUMINANCE; LASER RADIATION; PHOTOVOLTAIC EFFECT; RESOLUTION; THIN FILMS; TRANSIENTS