Influence of processing and intrinsic polymer parameters on photochemical stability of polythiophene thin films

被引:28
作者
Madsen, Morten V. [1 ]
Tromholt, Thomas [1 ]
Bottiger, Arvid [1 ]
Andreasen, Jens W. [1 ]
Norrman, Kion [1 ]
Krebs, Frederik C. [1 ]
机构
[1] Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark
关键词
P3HT; Photooxidation; Organic photovoltaics; Photo-chemical stability; Degradation; OXYGEN; DEGRADATION; P3HT;
D O I
10.1016/j.polymdegradstab.2012.07.021
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Intrinsic polymer parameters such as regio-regularity, molecular weight, and crystallinity play an important role when studying polymer stability. 18 different batches of poly-3-hexyl-thiophene (P3HT) were degraded in a solar simulator (AM1.5G, 1000 W/m(2)) and the degradation kinetics were monitored. The results suggest that the radical reaction responsible for the photodegradation takes place at terminal thiophene rings exposed at points were the conjugation is broken. This proposed mechanism is supported by the fact that stability scales with regio-regularity following the ratio of head-to-tail connected thiophene units. Annealing was found to relax the P3HT films and increase conjugation length and, in turn, increase stability observed as a delayed spectral blueshift caused by photochemical degradation. Crystallinity was found to play a minor role in terms of stability. Oxygen diffusion and light shielding effects were shown to have a negligible effect on the photochemical degradation rate. The results obtained in this work advance the understanding of polymer stability and will help improve the design of materials used for polymer solar cells resulting in longer lifetimes, which will push the technology closer to large-scale applications. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2412 / 2417
页数:6
相关论文
共 19 条
[1]   Influence of the microstructure on the photooxidative degradation of poly(3-hexylthiophene) [J].
Dupuis, Aurelie ;
Wong-Wah-Chung, Pascal ;
Rivaton, Agnes ;
Gardette, Jean-Luc .
POLYMER DEGRADATION AND STABILITY, 2012, 97 (03) :366-374
[2]  
Heliatek, HEL SETS NEW REC EFF
[3]   Photo-oxidation and ozonization of poly(3-hexylthiophene) thin films as studied by UV/VIS and photoelectron spectroscopy [J].
Hintz, H. ;
Egelhaaf, H. -J. ;
Peisert, H. ;
Chasse, T. .
POLYMER DEGRADATION AND STABILITY, 2010, 95 (05) :818-825
[4]   Photodegradation of P3HT-A Systematic Study of Environmental Factors [J].
Hintz, Holger ;
Egelhaaf, H. -J. ;
Luer, Larry ;
Hauch, Jens ;
Peisert, Heiko ;
Chasse, Thomas .
CHEMISTRY OF MATERIALS, 2011, 23 (02) :145-154
[5]   Semicrystalline morphology in thin films of poly(3-hexylthiophene) [J].
Hugger, S ;
Thomann, R ;
Heinzel, T ;
Thurn-Albrecht, T .
COLLOID AND POLYMER SCIENCE, 2004, 282 (08) :932-938
[6]   Stability/degradation of polymer solar cells [J].
Jorgensen, Mikkel ;
Norrman, Kion ;
Krebs, Frederik C. .
SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2008, 92 (07) :686-714
[7]   Stability of Polymer Solar Cells [J].
Jorgensen, Mikkel ;
Norrman, Kion ;
Gevorgyan, Suren A. ;
Tromholt, Thomas ;
Andreasen, Birgitta ;
Krebs, Frederik C. .
ADVANCED MATERIALS, 2012, 24 (05) :580-612
[8]   Photodegradation of Polythiophene-Based Polymers: Excited State Properties and Radical Intermediates [J].
Koch, Marius ;
Nicolaescu, Roxana ;
Kamat, Prashant V. .
JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (27) :11507-11513
[9]   Photoexcitation dynamics in regioregular and regiorandom polythiophene films -: art. no. 235122 [J].
Korovyanko, OJ ;
Österbacka, R ;
Jiang, XM ;
Vardeny, ZV ;
Janssen, RAJ .
PHYSICAL REVIEW B, 2001, 64 (23)
[10]  
Krebs F., 2008, POLYM PHOTOVOLTAICS