Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 41: Organic semiconductors

HL 41.2: Talk

Thursday, February 28, 2008, 15:15–15:30, ER 270

Charge carrier mobility in organic bulk P3HT:PCBM solar cells with varied donor–acceptor ratio — •Andreas Baumann¹, Carsten Deibel¹, Jens Lorrmann¹, Maria Hammer¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Physical Institute, Julius-Maximilians-University of Würzburg, Am Hubland, D-97074 Würzburg — ²ZAE Bayern, Div. Functional Materials for Energy Technology, Am Hubland, D-97074 Würzburg, Germany

The efficiency of organic solar cells has been increased to above 5 % in the last decade, promissing an interesting potential as a renewable energy source. For P3HT: PCBM heterojunction solar cells a ratio of 1:1 was found to yield the highest efficiencies. Concerning the donor–acceptor ratio, both an efficient charge transfer as well as a balanced mobility of the charge carriers are necessary to reach such high solar cell performances. We investigated the electron and hole mobilities in P3HT:PCBM heterojunction solar cells with different donor (P3HT)–acceptor (PCBM) ratio experimentally. For a deeper understanding, experimental results are discussed by comparing them with Monte Carlo simulations of hopping transport in a Gaussian density of states distribution.