NDLI: Interface limited charge extraction and recombination in organic photovoltaics

Content Provider	Royal Society of Chemistry (RSC)
Author	Lakhwani, Girish Greenham, Neil C. Friend, Richard H. Rao, Akshay Huck, Wilhelm T. S. Kumar, Abhishek Elmalem, Einat
Copyright Year	2014
Abstract	We report that the transit-time of photogenerated holes within an OPV device is significantly controlled by the interface between the photoactive layer and the electrode. We used time-resolved optical absorption spectroscopy to track the evolution and transport of photogenerated holes in situ within efficient PTB7:PC70BM (thieno [3,4-b] thiophene/benzodithiophene:[6,6]-phenyl C71-butyric acid methyl ester) devices. Our results demonstrate that the time required for 50% hole extraction is reduced from 2.3 μs for the standard devices to 0.9 μs either by introducing a thin layer of conjugated polyelectrolyte (CPE) layer at the electron-extracting cathode or simply by exposing the device to a polar solvent such as methanol which is used for spin coating the CPEs. We consider that the CPE modifies the interface between the photoactive layer and the cathode whereas the exposure of the device to associated polar solvent modifies the buried PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) hole extracting layer.
Starting Page	2227
Ending Page	2231
Page Count	5
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	7
Issue Number	7
Journal	Energy & Environmental Science
DOI	10.1039/c4ee00665h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	CPE PEDOT Electrode Absorption spectroscopy Thiophene Phenyl group Carboxylic acid Ester Polyelectrolyte Solvent Methanol Spin coating Poly(3 4-ethylenedioxythiophene) Polystyrene sulfonate
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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