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A Phase Diagram of the P3HT:PCBM Organic Photovoltaic System: Implications for Device Processing and Performance
Authors:
Paul
Hopkinson
(University of Cambridge)
,
Paul
Staniec
(University of Sheffield)
,
Andrew
Pearson
(University of Sheffield)
,
Alan
Dunbar
(University of Sheffield)
,
Tao
Wang
(University of Sheffield)
,
Anthony J.
Ryan
(University of Sheffield)
,
Richard A. L.
Jones
(University of Sheffield)
,
David
Lidzey
(University of Sheffield)
,
Athene
Donald
(University of Cambridge)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Macromolecules
, VOL 44 (8)
State:
Published (Approved)
Published:
March 2011
Diamond Proposal Number(s):
1203
Abstract: This paper describes the construction of a phase diagram for the as-cast state in the organic photovoltaic system P3HT:PCBM. Evidence for a transition to a phase-separated state at PCBM concentrations greater than 70 wt % is seen both by DMTA and GIWAXS, and the glass transition temperatures of blends in the single phase state below 70 wt % PCBM are observed to be raised compared to the pure polymer. Pure PCBM is observed to exhibit a thermal transition at 155 °C, an observation unreported to date-offering insight into crystallites commonly seen in device films. The liquid-crystal phase of P3HT is shown to persist in the presence of up to 41 wt % PCBM. In addition, pure PCBM is shown to be significantly hygroscopic, with important implications for the processing of high-performance devices.
Subject Areas:
Energy
Instruments:
I16-Materials and Magnetism
Added On:
18/03/2011 17:28
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