Unveiling hole trapping and surface dynamics of NiO nanoparticles

Luca D'Amario, Jens Föhlinger, Gerrit Boschloo, Leif Hammarström

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The research effort in mesoporous p-type semiconductors is increasing due to their potential application in photoelectrochemical energy conversion devices. In this paper an electron-hole pair is created by band-gap excitation of NiO nanoparticles and the dynamics of the electron and the hole is followed until their recombination. By spectroscopic characterization it was found that surface Ni3+ states work as traps for both electrons and holes. The trapped electron was assigned to a Ni2+ state and the trapped hole to a "Ni4+" state positioned close to the valence band edge. The recombination kinetics of these traps was studied and related with the concept of hole relaxation suggested before. The time scale of the hole relaxation was found to be in the order of tens of ns. Finally the spectroscopic evidence of this relaxation is presented in a sensitized film.

Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalChemical Science
Volume9
Issue number1
DOIs
Publication statusPublished - Jan 1 2017

ASJC Scopus subject areas

  • Chemistry(all)

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