@article{RappichHartigNickeletal.2005, author = {Rappich, J. and Hartig, P. and Nickel, N. H. and Sieber, I. and Schulze, S. and Dittrich, T.}, title = {Stable electrochemically passivated Si surfaces by ultra thin benzene-type layers}, issn = {0167-9317}, year = {2005}, abstract = {Ultra thin organic layers of benzene-type molecules are able to passivate Si surfaces. The organic layers were electrochemically deposited on Si surfaces from aqueous solution of diazonium compounds and show a blocking of the charge transfer from Si into the electrolyte after the deposition process. Electron microscopic images reveal a compact and homogeneous organic layer of 4-bromobenzene on the Si. The surface recombination increases only slightly with respect to a well H-passivated Si surface, so that the interface state density is about 10(11) cm(2) or slightly below. Organic layer modified Si surfaces are much longer stable in ambient air than the H-terminated surface as observed by a slower decay of the integrated photoluminescence intensity with time. Thermal desorption measurements show that the organic layer is stable up to about 200 degrees C.}, language = {en} }