Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 107: Poster: Emerging oxide semiconductors / Oxides other than ZnO and its relatives

HL 107.6: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

TEM and FIB-based EBIC investigations to study photovoltaic properties of a complex oxide pn-heterojunction — •Patrick Peretzki¹, Pablo Marín Perera¹, Benedikt Ifland², Daniel Mierwaldt², Philipp Saring¹, Christian Jooss², and Michael Seibt¹ — ¹IV. Physikalisches Institut, Georg-August-Universität Göttingen, Germany — ²Institut für Materialphysik, Georg-August-Universität Göttingen, Germany

The perovskite-structured p-doped manganite Pr_1−xCa_xMnO₃ (PCMO) combined with n-doped SrTi_1−yNb_yO₃ (STNO) is presently explored as a model system for manganite-based pn-heterojunctions. It is expected that the rapid thermalization of low-energy photoexcitated charge carriers can be quenched by making use of hot-polaron type correlated states with long lifetimes and/or long diffusion lengths, opening the possibility of converting a broad range of the solar spectrum. In this work, PCMO/STNO interfaces are investigated by Electron Beam Induced Current (EBIC) cross-section measurements by combining SEM-based EBIC with Focused Ion Beam preparation in dual beam instruments. As SEM-based EBIC is resolution-limited because of the probe size and the broad carrier generation volume, TEM lamellae are prepared from the material, which reduces the generation volume to a minimum and results in precise EBIC images of the PCMO/STNO interface. We thank the DFG for funding the research through CRC1073.