The semiconductor films of SrTiO 3 , α-Fe 2 O 3 and their heterojunction SrTiO 3 /α-Fe 2 O 3 were prepared on FTO (SnO 2 : F on glass) substrates by the spin-coating method and their structures and properties were characterized by XRD, SEM and photoelectrochemical measurements, respectively. It was observed that the photocurrent and the incident photon to current conversion efficiencies (IPCE or external quantum efficiencies) of the SrTiO 3 /α-Fe 2 O 3 heterojunction were higher than that of the single SrTiO 3 or α-Fe 2 O 3 film, particularly under visible light irradiation. The band structures of SrTiO 3 and α-Fe 2 O 3 were calculated. It was found that the charge carriers in α-Fe 2 O 3 had large effective masses while the charge carriers in SrTiO 3 had small effective masses at the bottom of the conduction band and at the top of the valence band, which meant weak mobility of holes photo-generated in α-Fe 2 O 3 and strong mobility of holes excited in SrTiO 3 . As to the SrTiO 3 /α-Fe 2 O 3 heterojunction, the special valence band structures of SrTiO 3 improved the separation efficiency of charge carriers which had been photo-generated in α-Fe 2 O 3 . This led to the enhancement of photocurrent densities and external quantum efficiencies in the SrTiO 3 /α-Fe 2 O 3 heterojunction photoanode.
No takes yet. Share an insight, caveat, or question.
Wang et al. (2007) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: