In situ study of the passivation of ZnO nanoparticle surfaces
ZnO semiconductor NPs (NPs) are of high importance in research due to their promising opto-electronical properties. This makes them favorable for the integration into e.g. solar cells. For these applications a layer of organic molecules is needed to passivate the NPs electronically. In a previous study, we detected the acetate layer surrounding the ZnO NPs directly using a combined approach of SAXS and SANS. The analysis of the simultaneous SAXS/SANS fits showed that the acetate layer had a thickness of about 1nm, which is increased for higher temperatures and longer ripening times. In this study we want to investigate the exchange of this acetate layer by two different catechol molecules which passivate the NP surface and make them suitable for the integration in solar cells. The surface coverage of catechol molecules attached to ZnO NPs could already be determined, however only by ex situ measurements. To gain inside into the passivation of ZnO NPs surfaces by the binding of catechol molecules we want to perform SANS measurements to study the shell characteristics for different amounts of added catechol in situ. Therefore we propose for three days of beamtime at D11.
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SCHINDLER Torben; LINDNER Peter; SCHMIELE Martin; SCHMUTZLER Tilo and UNRUH Tobias. (2015). In situ study of the passivation of ZnO nanoparticle surfaces. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1407
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