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Organic heterojunction photodiodes exhibiting low voltage, imaging-speed photocurrent gain

Source: Appl. Phys. Lett. 97, 073302 (2010); doi:10.1063/1.3481407

Published 18 August 2010

KEYWORDS and PACS
Keywords
PACS
  • 85.60.Dw
    Photodiodes; phototransistors; photoresistors
  • YEAR: 2010
RELATED DATABASES
Web of Science

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PUBLICATION DATA
ISSN:
1553-9644 (online)
Publisher:
AIP is a member of CrossRef AIP
William T. Hammond and Jiangeng Xue
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, USA
We report the demonstration of fast and strong photocurrent gain in organic photodiodes with tailored charge blocking layers. The hole blocking layer between the anode and the photoactive layer leads to accumulation of photogenerated holes at its interface with the active layer, which causes a strong secondary electron injection from the anode and as such a high photocurrent gain. Using a bulk heterojunction of C60 and copper phthalocyanine as the active layer, we have achieved photocurrent gains up to 500 across the visible spectrum and bandwidths on the order of 1 kHz, well above the imaging-compatible bandwidth (>60  Hz). ©2010 American Institute of Physics
History: Received 30 March 2010; accepted 2 August 2010; published 18 August 2010
Permalink: http://link.aip.org/link/?APPLAB/97/073302/1

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