Efficient Photoinduced Charge Injection from Chemical-Bath Deposited CdS into Mesoporous TiO2 Probed with Time-Resolved Microwave Conductivity

Piris, Jorge; Ferguson, Andrew J.; Kopidakis, Nikos; Blackburn, Jeff L.; Norman, Andrew G.; Rumbles, Garry; Selmarten, Don C.

doi:10.1021/jp800527r

Efficient Photoinduced Charge Injection from Chemical-Bath Deposited CdS into Mesoporous TiO2 Probed with Time-Resolved Microwave Conductivity

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/jp800527r· OSTI ID:950133

Piris, Jorge; ; Kopidakis, Nikos; ; ; ; Selmarten, Don C.

We use the contactless time-resolved microwave conductivity (TRMC) technique to investigate the photoconductance of CdS-coated mesoporous TiO2 and ZrO2. The CdS domains were grown directly on the surface of the oxide by a chemical bath deposition method. Mobile charge carriers are generated with a low yield following photoexcitation of CdS grown on ZrO2; there is no injection into the oxide and the short-lived photoconductance signal is attributed to the hole in CdS. In contrast, illumination of CdS domains grown on TiO2 results in very efficient electron injection into the TiO2 nanoparticles, producing long-lived charge carriers. We show that the quantum yield for electron injection into TiO2 per photon absorbed by the CdS sensitizer is close to unity. The photoconductance action spectrum follows the absorption of the CdS domains, which indicates that the charge injection efficiency does not depend on wavelength in the range where the CdS absorbs (425-550 nm).

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science, Basic Energy Sciences

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 950133

Report Number(s):: NREL/JA-270-42988; MainId:47457; UUID:9a2a0745-d8d4-e411-b769-d89d67132a6d; MainAdminId:29549

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 2008 Vol. 112; ISSN 1932-7447

Country of Publication:: United States

Language:: English

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Efficient Photoinduced Charge Injection from Chemical-Bath Deposited CdS into Mesoporous TiO2 Probed with Time-Resolved Microwave Conductivity

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