Affiliation:
1. PhotoCatalytic Synthesis Group MESA+ Institute for Nanotechnology University of Twente P.O. Box 217 7500 AE Enschede (The Netherlands
Abstract
AbstractP‐type metal oxides, and in particular NiO, are typically used as hole accepting layers in dye‐sensitized photocathodes. Delafossites (CuMO2) with M=B, Al, Cr or Ga have recently been proposed as attractive substitutes for NiO, with theoretically a higher hole mobility than NiO, therefore allowing a higher efficiency when the photocathode is applied in solar to fuel devices. We have experimentally validated the photoelectrochemical performance of photocathodes consisting of nanoporous CuBO2 (CBO) on Fluorine‐doped Tin Oxide substrates, photosensitized with a light absorbing P1 dye. Femtosecond transient absorption and time‐resolved photoluminescence studies show that light‐induced hole injection occurs from the P1 dye into the CBO in a few ps, comparable to the time constant observed for NiO‐based photocathodes. Importantly, the CBO‐based photocathode shows significantly slower charge recombination than the NiO‐based analogue. These results illustrate the promise of CBO as a p‐type semiconductor in solar energy conversion devices.
Subject
General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry
Cited by
1 articles.
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