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| Home > Publications database > Unravelling the Origin of Ultra‐Low Conductivity in SrTiO$_3$ Thin Films: Sr Vacancies and Ti on A‐Sites Cause Fermi Level Pinning > print |
| Home > Publications database > Unravelling the Origin of Ultra‐Low Conductivity in SrTiO$_3$ Thin Films: Sr Vacancies and Ti on A‐Sites Cause Fermi Level Pinning > print |
| 001 | 484450 | ||
| 005 | 20250715175828.0 | ||
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| 100 | 1 | _ | |a Morgenbesser, Maximilian |0 P:(DE-H253)PIP1089793 |b 0 |
| 245 | _ | _ | |a Unravelling the Origin of Ultra‐Low Conductivity in SrTiO$_3$ Thin Films: Sr Vacancies and Ti on A‐Sites Cause Fermi Level Pinning |
| 260 | _ | _ | |a Weinheim |c 2022 |b Wiley-VCH |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Different SrTiO$_3$ thin films are investigated to unravel the nature of ultra-low conductivities recently found in SrTiO$_3$ films prepared by pulsed laser deposition. Impedance spectroscopy reveals electronically pseudo-intrinsic conductivities for a broad range of different dopants (Fe, Al, Ni) and partly high dopant concentrations up to several percent. Using inductively-coupled plasma optical emission spectroscopy and reciprocal space mapping, a severe Sr deficiency is found and positron annihilation lifetime spectroscopy revealed Sr vacancies as predominant point defects. From synchrotron-based X-ray standing wave and X-ray absorption spectroscopy measurements, a change in site occupation is deduced for Fe-doped SrTiO$_3$ films, accompanied by a change in the dopant type. Based on these experiments, a model is deduced, which explains the almost ubiquitous pseudo-intrinsic conductivity of these films. Sr deficiency is suggested as key driver by introducing Sr vacancies and causing site changes (Fe$_{Sr}$ and Ti$_{Sr}$) to accommodate nonstoichiometry. Sr vacancies act as mid-gap acceptor states, pinning the Fermi level, provided that additional donor states (most probably Ti$_{Sr}^{\bullet\bullet}$) are present. Defect chemical modeling revealed that such a Fermi level pinning also causes a self-limitation of the Ti site change and leads to a very robust pseudo-intrinsic situation, irrespective of Sr/Ti ratios and doping. |
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| 700 | 1 | _ | |a Viernstein, Alexander |0 P:(DE-H253)PIP1089775 |b 1 |
| 700 | 1 | _ | |a Schmid, Alexander |0 P:(DE-HGF)0 |b 2 |e Corresponding author |
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| 773 | _ | _ | |a 10.1002/adfm.202202226 |g Vol. 32, no. 38, p. 2202226 - |0 PERI:(DE-600)2039420-2 |n 38 |p 2202226 |t Advanced functional materials |v 32 |y 2022 |x 1057-9257 |
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