Share Email Print

Proceedings Paper

Elucidating the aspect of phase separation in organic blends by means of thermal analysis
Author(s): A. Swinnen; J. Zhao; G. Van Assche; D. Vanderzande; M. D'Olieslaeger; J. V. Manca; B. Van Mele
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Control of morphology is a key issue in order to improve the performance of organic bulk heterojunction solar cells. Solar cells consisting of a blend of regioregular P3HT (poly(3-hexylthiophene)) and PCBM ([6-6]-phenyl C61 butyric acid methyl ester) have demonstrated the highest efficiencies until now (up to 5 %). This performance was achieved by applying a post-production annealing, which is considered to induce a dual crystallization behavior. In order to control and tune the morphology, the phase behavior needs to be described in terms of the underlying fundamental thermodynamics. Hence, it is essential to obtain a phase diagram of the blend. In this study, the state diagram of P3HT:PCBM blends is measured by means of standard and modulated temperature differential scanning calorimetry (DSC). For the first time, the glass transition (Tg) of PCBM could be determined. All blends evidenced a single Tg, indicating an homogeneous blend is formed. Phase separation is thus only induced from crystallization and no "intrinsic" phase separation is occurring in the blend.

Paper Details

Date Published: 17 October 2007
PDF: 11 pages
Proc. SPIE 6656, Organic Photovoltaics VIII, 665619 (17 October 2007); doi: 10.1117/12.733761
Show Author Affiliations
A. Swinnen, Hasselt Univ. (Belgium)
J. Zhao, Vrije Univ. Brussel (Belgium)
G. Van Assche, Vrije Univ. Brussel (Belgium)
D. Vanderzande, Hasselt Univ. (Belgium)
IMEC vzw (Belgium)
M. D'Olieslaeger, Hasselt Univ. (Belgium)
IMEC vzw (Belgium)
J. V. Manca, Hasselt Univ. (Belgium)
IMEC vzw (Belgium)
B. Van Mele, Vrije Univ. Brussel (Belgium)

Published in SPIE Proceedings Vol. 6656:
Organic Photovoltaics VIII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

© SPIE. Terms of Use
Back to Top