Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 44: Postersession II

DS 44.41: Poster

Thursday, March 23, 2017, 17:00–19:00, P1C

Photo-Degradation studies of PDTSTzTz (KP115) for application in OVP — •Andreas Früh¹, Ulf Dettinger¹, Heiko Peisert¹, Hans-Joachim Egelhaaf², and Thomas Chassé¹ — ¹Eberhard-Karls-University, Institute for Physical and Theoretical Chemistry, Auf der Morgenstelle 18, D-72076 Tübingen, Germany — ²Belectric OPV GmbH, Landgrabenstr. 94, D-90443 Nürnberg, Germany

Organic photovoltaic (OPV) offers a possible solution for the future energy demands and combines challenging design requirements with flexibility. On the other hand the limited life time of such devices remains a challenge. UV-Vis and FTIR spectroscopy as well as AFM and REM microscopy were used to study the photo-oxidation of the Low-Band-Gap Polymer Poly[4,4`-bis(2-ethylhexyl)dithieno[3,2-b:2`,3`-d]silole]-2,6-diyl-alt-[2,5-bis(3-tetradecylthiophen-2-yl)thiazole-[5,4-d]thiazole-1,8-diyl] (PDTSTzTz) as pristine film and blended with PC[60]BM. For pristine PDTSTzTz films in ambient air, an UV induced radical mechanism was recently suggested [1]. In this work we study the photo-oxidation in dry synthetic air as a function of the wavelength of the light and compare the results to irradiation under standard Air Mass 1.5 conditions. The results point to a different degradation mechanism for lower wavelengths. The degradation of the different monomer units of the polymer backbone as well as the side chains is monitored by IR spectroscopy. [1] H. S. Silva et al., J. Mater. Chem. A, 4 (2016) 15647-15654.