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SUMMARY:Organic Photovoltaics with Efficient Hole Extraction based on Hybr
 id Carbon Nanotube Networks - Dinesha Dabera\, 
DTSTART:20130220T103000Z
DTEND:20130220T120000Z
UID:TALK43522@talks.cam.ac.uk
CONTACT:Haider Butt
DESCRIPTION:Bulk heterojunction solar cells based on an organic donor that
  generates excitons upon photo irradiation and an organic/ inorganic accep
 tor is widely regarded as a potential route towards efficient\, low cost r
 enewable energy source that can be printed onto flexible substrates. Over 
 the past decade\, embedding of carbon nanotubes into organic solar cells h
 as been an area of intensive investigation. The role of carbon nanotubes i
 n such photovoltaic systems have been investigated for a variety of applic
 ations ranging from  transparent electrodes\, transparent and conductive h
 ole or electron extraction layers\, electron acceptors as well as addition
 al exciton dissociation sites. In this work\, we demonstrate the use of po
 lymer wrapped semiconducting single walled carbon nanotubes (s-SWNTs) with
  a transmission of 89% at 550 nm as efficient hole extraction layers in or
 ganic photovoltaics based on a device architecture consisting of PTB7/PC70
 BM as the active layer. We report the highest reported power conversion ef
 ficiency (PCE) of a carbon nanotube incorporated organic solar cell with a
 n efficiency of 7.6%. The effectiveness of the nanohybrid hole transport l
 ayer is further proven by the low PCE of 5.6% for the reference device whi
 ch does not consist of a hole extraction layer. This enhancement is mainly
  governed by the 32% increase in fill factor compared to the reference dev
 ice without a hole transport layer.
LOCATION:Seminar Room\, CAPE Building University of Cambridge 9 JJ Thomson
  Avenue Cambridge CB3 0FA United Kingdom
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