Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 35, Pages 17901-17908Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp402042a
Keywords
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Funding
- German Federal Ministry of Education and Research [BMBF 03 SF0339G]
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Electron injection from photoexcited chem-isorbed dyes into zinc oxide is known to proceed in a stepwise manner, yet the origin of the injection retardation remains controversial. Here we present a complementary time-resolved spectroscopy study on the electron injection dynamics from organic dyes into ZnO using model perylene derivatives with systematically lengthened bridge units to clarify the influence of the positively charged cation on the escape of the injected electron. The combination of transient absorption, optical-pump terahertz-probe, and time-resolved two-photon photo-emission spectroscopy reveals that the delayed release of charges into ZnO is independent of Coulomb attraction between the dye cation and the injected electron. Rather, following dye photoexcitation the primary acceptor states of electron transfer into ZnO are interface states formed between the dye and the ZnO surface, which retard the formation of free charges.
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