Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 19: Organic photovoltaics and electronics - mostly properties of the absorber (with DS)
HL 19.8: Talk
Monday, March 16, 2015, 18:45–19:00, EW 202
OTRACE: The technique to study charge carrier mobility and lifetime in organic thin film solar cells under real operating conditions — •Andreas Baumann1, Andreas Zusan2, and Vladimir Dyakonov1,2 — 1Bayerisches Zentrum für Angewandte Energieforschung, Am Galgenberg 87, D-97074 Würzburg — 2Experimentelle Physik 6, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg
For the development and design of new promising semiconducting materials for organic electronics material parameters like the mobility and the lifetime of photogenerated charge carriers need to be investigated and optimized. Usually, techniques such as TOF, SCLC, or photo-CELIV are used to study the charge carrier transport. Especially, the latter technique principally enables one to study both charge carrier mobility and lifetime. However, all of these techniques are not really suited to study real solar cell devices under ambient conditions. With our newly developed experimental method of open circuit corrected transient charge extraction (OTRACE)[1] it is feasible to easily determine the charge carrier mobility and lifetime under operating conditions of the solar cell device. In addition, the mobility determined by OTRACE is the most relevant one for organic solar cells at open circuit conditions without suffering from injected charge carriers, which would result in major RC limitations. In combination with IV measurement this technique can be easily used for material screening producing fast output of relevant solar cell parameters. [1] Baumann et. al., AM, 2012. 24(32): p. 4381-4386.