Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 45: Joint Poster Session

HL 45.14: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Time resolved Spectroscopy on different organic polymer/fullerene blends — •Berthold Jaeck¹, Bjoern Gieseking¹, Carsten Deibel¹, and Vladimir Dyakonov^1,2 — ¹Experimentelle Physik VI, Julius-Maximilians-Universitaet Wuerzburg, D-97074 Wuerzburg — ²ZAE Bayern, Div. Functional Materials for Energy Technology, D-97074 Wuerzburg

One main topic for highly efficient organic bulk-heterojunction solar cells is a better understanding of the fundamental physical processes after photo-excitation and hence the optimization of the device design. Many of these processes, e.g. the interfacial charge transfer dynamics and the free charge carrier generation, are occuring on very short time scales in the sub-picosecond regime. Therefore time resolved spectroscopic techniques are of crucial importance.

Using femtosecond transient absorption spectroscopy we investigated the exciton and free charge carrier dynamics of poly(3-hexylthiophene), P3HT and poly[2,3-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)], PCPDTBT blended with diverse fullerene derivatives. Additionally, picosecond time resolved photoluminescence measurements were carried out, probing radiative decay paths so that a complete picture of these intial processes could be reached. Furthermore, the influences of structural and energetic disorder on these dynamics were examined.