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Photoelectrochemical Characterization of Nanocrystalline ZnS:Mn 2+ Layers
Author(s) -
Suyver J.F.,
Bakker R.,
Meijerink A.,
Kelly J.J.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200103)224:1<307::aid-pssb307>3.0.co;2-#
Subject(s) - nanocrystalline material , photoluminescence , photocurrent , materials science , luminescence , photoelectrochemistry , anode , charge carrier , analytical chemistry (journal) , nanocrystal , kinetics , electrode , optoelectronics , chemistry , nanotechnology , electrochemistry , physics , chromatography , quantum mechanics
Measurements of the photoelectrochemical properties of nanocrystalline ZnS electrodes doped with Mn 2+ are presented and discussed. The observation of both anodic and cathodic photocurrent is direct evidence for the nanocrystalline nature of the system. In‐situ photoluminescence measurements showed stable Mn 2+ related photoluminescence over a large potential range. Due to the unfavourable kinetics of electron and hole transfer across the interface between the nanocrystallites and solution, it is concluded that recombination accounts for most of the charge carriers generated by illumination. Breakdown of the ZnS into elementary Zn and S 2— in solution was also observed at negative potential. This breakdown introduces new non‐radiative decay paths and is responsible for the slow luminescence decrease as a function of operating time.