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The absolute value of the efficiency of electron injection from an excited coumarin dye (NKX-2311) into a nanocrystalline ZnO film was estimated as 0.8 ± 0.1 through transient absorption measurements. This value was obtained by using the molar absorption coefficient of the oxidized form of NKX-2311 determined in solution. Using this value and the previously obtained relative injection efficiency, we estimated the molar absorption coefficients of the oxidized form of N3 dye ( cis -bis(4,4‘-dicarboxy-2,2‘-bipyridine)dithiocyanato ruthenium(II); Ru(dcbpy) 2 (NCS) 2 ) and the conducting electrons in the ZnO film.
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Yoshihara et al. (2004) studied this question.
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