Where Do Photogenerated Holes Go in Anatase:Rutile TiO2? A Transient Absorption Spectroscopy Study of Charge Transfer and Lifetime.

The Journal of Physical Chemistry. a
Andreas KafizasJames Durrant

Abstract

Anatase:rutile TiO2 junctions are often shown to be more photocatalytically active than anatase or rutile alone, but the underlying cause of this improvement is not fully understood. Herein, we employ transient absorption spectroscopy to study hole transfer across the anatase:rutile heterojunction in films as a function of phase composition. By exploiting the different signatures in the photoinduced absorption of trapped charges in anatase and rutile, we were able to separately track the yield and lifetime of holes in anatase and rutile sites within phase composites. Photogenerated holes transfer from rutile to anatase on submicrosecond time scales. This hole transfer can significantly increase the anatase hole yield, with a 20:80 anatase:rutile composite showing a 5-fold increase in anatase holes observed from the microsecond. Hole transfer does not result in an increase in charge-carrier lifetime, where an intermediate recombination dynamic between that of pure anatase (t1/2 ≈ 0.5 ms) and rutile (t1/2 ≈ 20 ms) is found in the anatase:rutile junction (t1/2 ≈ 4 ms). Irrespective of what the formal band energy alignment may be, we demonstrate the importance of trap-state energetics for determining the direction of photogenerated...Continue Reading

References

Dec 1, 2007·Chemical Communications : Chem Comm·Elena SelliLucio Forni
Sep 5, 2012·Chemistry : a European Journal·Andreas KafizasIvan P Parkin
May 2, 2013·Physical Chemistry Chemical Physics : PCCP·Alexander J CowanJames R Durrant
Jun 4, 2013·Chemical Communications : Chem Comm·Ai-Yong ZhangHan-Qing Yu
Jul 9, 2013·Nature Materials·David O ScanlonAlexey A Sokol
Jan 1, 2014·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Federico M PesciAlexander J Cowan
Jun 21, 2014·Journal of the American Chemical Society·Stephanie R PendleburyJames R Durrant

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Citations

Aug 27, 2016·The Journal of Physical Chemistry Letters·Michael SachsJames R Durrant
Aug 30, 2016·The Journal of Physical Chemistry Letters·Francesca NunziAnnabella Selloni
Feb 9, 2017·Faraday Discussions·Jenny SchneiderDetlef W Bahnemann
Dec 1, 2018·Nanoscale·Min Ling, Christopher S Blackman
Aug 4, 2019·Environmental Science and Pollution Research International·Estefania BraccoRoberto Candal
Jan 21, 2020·Advanced Materials·Nasir UddinZongyou Yin
Feb 3, 2019·The Journal of Chemical Physics·Ludovic Troian-GautierGerald J Meyer
Apr 19, 2019·Chemical Science·Shababa SelimAndreas Kafizas
Jun 27, 2019·Chemistry : a European Journal·Arreerat JiamprasertboonClaire J Carmalt
Aug 6, 2020·The Journal of Chemical Physics·Yaqing WeiOleg V Prezhdo
Nov 4, 2020·Physical Chemistry Chemical Physics : PCCP·Deb Sankar DeRaj Ganesh S Pala
Jan 12, 2021·Chemical Communications : Chem Comm·Christopher O'Rourke, Andrew Mills
Feb 18, 2021·ACS Applied Materials & Interfaces·Abdullah M AlotaibiIvan P Parkin
Feb 18, 2021·ACS Applied Materials & Interfaces·Asif IqbalRaul Quesada-Cabrera
Mar 20, 2021·Chemosphere·Christopher O'Rourke, Andrew Mills
May 14, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Wonho NohTaek Seung Lee
Aug 10, 2021·ACS Applied Materials & Interfaces·Lei JinJie He
Aug 5, 2017·Chemical Reviews·Yoshio Nosaka, Atsuko Y Nosaka
Jul 25, 2017·Journal of the American Chemical Society·Camilo A MesaJames R Durrant
Dec 13, 2018·Journal of the American Chemical Society·Forrest A L LaskowskiShannon W Boettcher
Feb 29, 2020·ACS Applied Materials & Interfaces·Abdullah M AlotaibiIvan P Parkin
Nov 20, 2021·The Journal of Physical Chemistry Letters·Valentin Diez-CabanesMariachiara Pastore

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