Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 13: Organic Electronics and Photovoltaics CPP-I (jointly with CPP, HL, and O)

DS 13.5: Talk

Monday, March 14, 2011, 15:15–15:30, ZEU 222

Degradation effects related to the hole transport layer in organic solar cells — •Bernhard Ecker¹, Jairo Nolasco², Josep Pallarés², Lluis Marsal², Jörg Posdorfer³, Jürgen Parisi¹, and Elizabeth von Hauff¹ — ¹Energy and Semiconductor Research Laboratory, Institute of Physics, Carl von Ossietzky University, 26111 Oldenburg (Germany) — ²Departament d`Enginyeria Electrònica Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, 43007 Tarragona (Spain) — ³Enthone Nano Science Centre, Ormecon GmbH, Ferdinand-Harten-Str. 7, 22949, Ammersbek (Germany)

We discuss the influence of the hole transport layer on the device stability in organic bulk-heterojunction solar cells. Two water based hole transport layers, poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonate) (PEDOT:PSS) and polyaniline : poly(styrene sulfonate) (PANI:PSS), and one isopropyl alcohol based PANI:PSS transport layer were investigated. Solar cells were prepared with the three different hole transport layers and degraded under illumination. Current-voltage, capacitance-voltage, and capacitance-frequency data were collected at varying light intensities over a period of 7 hours. Solar cell performance and stability were compared between non encapsulated and encapsulated samples to obtain understanding about degradation effects related to oxygen and water as well as degradation mechanisms related to the intrinsic instability of the solar cell materials and interfaces. We show that the properties of the hole transport layer can have a significant impact on the stability of organic solar cells.