Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 30: Poster 2
HL 30.27: Poster
Thursday, September 8, 2022, 11:00–13:00, P3
Temperature dependent light beam induced current (LBIC) investigation of PCMO-STNO interfaces — •Sophie Schaible1, Tobias Westphal1, Felix Müller1, Stephan Melles2, Christian Jooss2, and Michael Seibt1 — 1IV. Physical Institute, University of Goettingen, Göttingen, Germany — 2Institute for Materials Physics, University of Goettingen, Göttingen, Germany
Pn-heterojunctions of calcium doped praseodymium manganite Pr0.66Ca0.34MnO3 and niobium doped strontium titanite SrTi0.998Nb0.002O3 (PCMO-STNO) are used as a model system to investigate next generation solar cells going beyond the Shockley-Queisser limit by harvesting hot polaron-type charge carriers. In order to study the photovoltaic response in combination with the temperature and wavelength dependent generation of charge carriers, LBIC is used on a specially grown wedge-shaped PCMO thin film. A position dependent signal is obtained, which translates into the variation of the absorber thickness. PCMO has a perovskite structure and exhibits strong electron-phonon coupling leading to stable polarons. At the charge ordering temperature (TCO≈ 230 K) PCMO undergoes a phase transition from the semiconducting paramagnetic to the charge ordered phase [1]. Liquid nitrogen cooling of the LBIC setup enables temperature dependent LBIC measurements below room temperature and thus gives insights into this transition. Comparison with temperature dependent electron beam induced current (EBIC) measurements highlights differences between photon and electron excitation. [1] L. Wu et al., Phys. Rev. B 76, 174210 (2007)