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@article{Sachs:2016:10.1021/acs.jpclett.6b01501,
author = {Sachs, M and Pastor, E and Kafizas, A and Durrant, JR},
doi = {10.1021/acs.jpclett.6b01501},
journal = {Journal of Physical Chemistry Letters},
pages = {3742--3746},
title = {Evaluation of Surface State Mediated Charge Recombination in Anatase and Rutile TiO2},
url = {http://dx.doi.org/10.1021/acs.jpclett.6b01501},
volume = {7},
year = {2016}
}

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TY  - JOUR
AB  - In nanostructured thin films, photogeneratedcharge carriers can access the surface more easily than indense films and thus react more readily. However, the highsurface area of these films has also been associated withenhanced recombination losses via surface states. We hereinuse transient absorption spectroscopy to compare the ultrafastcharge carrier kinetics in dense and nanostructured TiO2films for its two most widely used polymorphs: anatase andrutile. We find that nanostructuring does not enhance recombinationrates on ultrafast timescales, indicating thatsurface state mediated recombination is not a key loss pathwayfor either TiO2 polymorph. Rutile shows faster, and lessintensity-dependent recombination than anatase, which weassign to its higher doping density. For both polymorphs, weconclude that bulk rather than surface recombination is theprimary determinant of charge carrier lifetime.
AU  - Sachs,M
AU  - Pastor,E
AU  - Kafizas,A
AU  - Durrant,JR
DO  - 10.1021/acs.jpclett.6b01501
EP  - 3746
PY  - 2016///
SN  - 1948-7185
SP  - 3742
TI  - Evaluation of Surface State Mediated Charge Recombination in Anatase and Rutile TiO2
T2  - Journal of Physical Chemistry Letters
UR  - http://dx.doi.org/10.1021/acs.jpclett.6b01501
UR  - http://hdl.handle.net/10044/1/39713
VL  - 7
ER  -

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