Dresden 2009 – wissenschaftliches Programm

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.70: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

Room temperature sintering of organosoluble ZnO nanoparticles for applications in electronic devices — •Thomas V. Richter, Felix Stelzl, Uli Würfel, Michael Niggemann, and Sabine Ludwigs — Freiburger Materialforschungszentrum Stefan-Meier-Str. 21, D-79104 Freiburg

During the last years, interest in nano-sized, inorganic semiconductors has grown due to their perspective application in electronic devices. In particular the use of inorganic semiconductor nanoparticles as acceptor phase in polymer-inorganic hybrid solar cells (h-SC) is promising. Special attention was given to nanocrystalline ZnO (n-ZnO) due to its abundance, low toxicity and easy tunability in shape and size. To obtain the full advantage of n-ZnO in h-SCs, there are two main issues to be addressed: In order to guarantee good interdispersion of the nanoparticles with the conjugated polymer in the photoactive layer, good solubility of both materials in organic solvents is necessary. Furthermore, interparticle contact has to exist after blend deposition to allow electron transport within the ZnO phase. Those requirements are often contradictory since good particle solubility requires large ligands, which in turn impede continuous percolation pathways in films. The strategy presented by us addresses both of the aforementioned problems. We synthesized n-ZnO with a weakly bound ligand that promotes solubility and allows for its post-processing removal in vacuum to establish interparticle contact. Charge carrier transport was investigated by FET measurements which indicate that ligand removal is applicable in pure n-ZnO thin films as well as in P3HT/n-ZnO blends.