Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 23: Focus Session: Thin Film Photovoltaic Materials and Solar Cells II
DS 23.6: Vortrag
Mittwoch, 13. März 2013, 16:00–16:15, H8
New insights into the mechanisms of photodegradation / stabilization of P3HT:PCBM active layers using poly(3-hexyl-d13-thiophene) — •Aurélien Tournebize1, Pierre-Olivier Bussière1, Pascal Wong-Wah-Chung1, Agnès Rivaton1, Jean-Luc Gardette1, Kion Norrman2, Frederik C. Krebs2, Hussein Medlej3, Roger C. Hiorns3, and Christine Dagron-Lartigau3 — 1Institut de Chimie de Clermont-Ferrand, Equipe Photochimie Clermont-Ferrand, France — 2IPREM, Université de Pau et des Pays de l'Adour, France — 3Technical University of Denmark, Department of Energy, Denmark
The use of deuterated P3HT permitted distinction of carbon originating from the hexyl-d13 chain and carbon originating from PCBM and the non-deuterated thiophene unit. The photooxidation of both components of the blend was monitored using the combination of various analytical techniques (Tof-SIMS, XPS, infrared and UV-visible spectroscopy, gas phase analysis) to probe the bulk and the surface of the deposit.
The results show that the stabilization of P3HT by PCBM is due to morphological changes during photooxidation. In parallel, the wavelength effect has been investigated.
The results obtained in this work advance the understanding of active layer stability and will help improve the design of organic solar cells resulting in longer lifetimes thanks to the use of cut-off filter in the substrate or encapsulation of the devices.