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000861801 1001_ $$00000-0003-4036-2252$$aLewin, Martin$$b0
000861801 245__ $$aNanospectroscopy of Infrared Phonon Resonance Enables Local Quantification of Electronic Properties in Doped SrTiO 3 Ceramics
000861801 260__ $$aWeinheim$$bWiley-VCH$$c2018
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000861801 520__ $$aAmong the novel materials for electronic applications and novel device concepts beyond classical Si‐based CMOS technology, SrTiO3 represents a prototype role model for functional oxide materials: It enables resistive switching, but can also form a 2D electron gas at its interface and thus enables tunable transistors. However, the interplay between charge carriers and defects in SrTiO3 is still under debate. Infrared spectroscopy offers the possibility to characterize structural and electronic properties of SrTiO3 in operando, but is hampered by the diffraction‐limited resolution. To overcome this limitation and obtain nanoscale IR spectra of donor‐doped Sr1‐xLaxTiO3 ceramics, scattering‐type scanning near‐field optical microscopy is applied. By exploiting plasmon–phonon coupling, the local electronic properties of doped SrTiO3 are quantified from a detailed spectroscopic analysis in the spectral range of the near‐field ‘phonon resonance’. Single crystal‐like mobility, an increase in charge carrier density N and an increase in ε∞ at grain boundaries (µ≈ 5.7 cm2 V−1s−1, N = 7.1 × 1019 cm−3, and ε∞ = 7.7) and local defects (µ≈ 5.4 cm2 V−1s−1, N = 1.3 × 1020 cm−3, and ε∞ = 8.8) are found. In future, subsurface quantification of defects and free charge carriers at interfaces and filaments in SrTiO3 can be envisioned.
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000861801 7001_ $$0P:(DE-Juel1)159254$$aBaeumer, Christoph$$b1
000861801 7001_ $$0P:(DE-Juel1)130677$$aGunkel, Felix$$b2
000861801 7001_ $$0P:(DE-HGF)0$$aSchwedt, Alexander$$b3
000861801 7001_ $$0P:(DE-HGF)0$$aGaussmann, Fabian$$b4
000861801 7001_ $$0P:(DE-HGF)0$$aWueppen, Jochen$$b5
000861801 7001_ $$0P:(DE-Juel1)130836$$aMeuffels, Paul$$b6
000861801 7001_ $$0P:(DE-HGF)0$$aJungbluth, Bernd$$b7
000861801 7001_ $$0P:(DE-Juel1)130824$$aMayer, Joachim$$b8
000861801 7001_ $$0P:(DE-Juel1)130620$$aDittmann, Regina$$b9
000861801 7001_ $$0P:(DE-Juel1)131022$$aWaser, R.$$b10
000861801 7001_ $$00000-0002-0628-3043$$aTaubner, Thomas$$b11$$eCorresponding author
000861801 773__ $$0PERI:(DE-600)2039420-2$$a10.1002/adfm.201802834$$gVol. 28, no. 42, p. 1802834 -$$n42$$p1802834 -$$tAdvanced functional materials$$v28$$x1616-301X$$y2018
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