SrTiO3 based high temperature solid oxide solar cells: Photovoltages, photocurrents and mechanistic insight

Semiconducting eutectic materials for photocatalysis and photoelectrochemistry applications: a perspective

“…123,124 These interface-based heterojunctions have also been utilized for solar energy devices where interfaces are main places of charge-transfer. 81,125 Such interfaces can be made using the m-pulling method that can be visible up to the surface and provides profound control of the active sites of heterojunctions at the surface leading to further modulation of PEC properties.…”

How UV light lowers the conductivity of SrTiO3 by photochemical water splitting at elevated temperature

“…within the first few μm. 9,20 Thus, the in-plane conductivity changes of all samples cannot be explained by photoconductivity. This is true for the drastic increases of back side contacted specimens by more than (nearly) two orders of magnitude in air (N 2 ), and also for the (somewhat faster) decrease of the conductivity in dry hydrogen.…”

“…According to and assuming a thickness of 1 μm in which the UV light is mostly (approx. 80%) 9 absorbed, the effective photoconductivity in this 1 μm layer is by a factor of approx. 600 higher than the bulk conductivity before UV irradiation.…”

“…In recent years, the properties of the model perovskite SrTiO 3 1-6 upon above band gap light exposure at elevated temperatures came into the focus of research. Several different phenomena were observed and described, such as UV-induced changes of the oxygen exchange kinetics, 7 light induced battery type voltages in solid oxide cells, 8 varying photovoltages in SrTiO 3 based high temperature solar cells, 9 high temperature photochromism, 10 and conductivity variations under UV illumination. 8,11,12 Many of these observations can be explained by assuming a light driven oxygen incorporation into SrTiO 3 and an increase of the oxygen chemical potential in the entire SrTiO 3 bulk.…”

Photoinduced electronic and ionic effects in strontium titanate

“…Different perovskite-type oxides and metals have been used as top layers, e.g. La 1− x Sr x Cr 1− y Mn y O 3 and Au, respectively, with overall high photovoltages of up to above 1.1 V. 135 A time dependent behaviour upon switching the UV light on or off is observed, however, the time scales here are not in the ps to μs range as they are for the low temperature counterparts, but rather in the couple of minutes range. These slow processes are – in fact – not attributed to electronic processes, but to ionic changes, particularly to a change in oxygen stoichiometry upon illumination via faster oxygen incorporation.…”