Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Organic Electronics and Photovoltaics I (DS jointly with HL, O)
O 3.5: Vortrag
Montag, 31. März 2014, 10:45–11:00, ZEU 222
Towards low-temperature synthesis of polymer/titania hybrid films for application in photovoltaics — Martin A. Niedermeier1, Monika Rawolle1, Erik V. Braden1, Kuhu Sarkar1, Eva M. Herzig2, Volker Körstgens1, and •Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2TU München, Munich School of Engineering, James-Franck-Str. 1, 85748 Garching
In a hybrid solar cell an inorganic matrix, such as titania, is combined with a hole-conducting polymer to form a so-called bulk heterojunction. The functionality of such a system depends strongly on the quality of the polymer/semiconductor interface. A very common approach to fabricate that interface is the so-called backfilling of the existing inorganic matrix with the conducting polymer. This approach is generally a two-step process, as the fabrication of the inorganic matrix usually involves high temperatures, which destroy all organic material present in the system. To date the subsequent backfilling of that matrix remains challenging, since a lot of problems have to be overcome. A workaround to these problems is promised by a low-temperature sol-gel process, in which the polymer and the inorganic semiconductor network are fabricated simultaneously. Approaches towards such low-temperature synthesis of polymer/titania hybrid films for application in photovoltaics are presented. These novel routes make use of special tailored block copolymers as structure directing agent. Film morphology and device function are investigated.