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HL: Fachverband Halbleiterphysik
HL 48: Heterostructures, Interfaces and Surfaces: Fabrication and Structure
HL 48.4: Vortrag
Donnerstag, 12. März 2026, 15:45–16:00, POT/0251
Acoustoelectric effect in organic-inorganic semiconductor systems — •Paromita Bhattacharjee1, Patrick Ganswindt2, Alexander S. Urban2, and Hubert Krenner1 — 1Institute of Physics, University of Münster, Germany — 2Faculty of Physics, Ludwig-Maximilians-Universität München, Germany
Surface acoustic waves (SAWs) are elastic waves propagating on the surface of a piezoelectric solid and while interacting with a semiconductor, its strain and piezoelectric fields modulate the band-gap. Strain-induced field imposes an acoustoelectric (AE) drag on the charges in the direction of SAW propaga-tion, and in a photoconductive semiconductor, excitons get ionized by piezoelectric field into separate elec-trons and holes, captured and transported by SAW [1]. Utilizing these effects, we present first study of SAW-induced charge transport in hybrid organic-inorganic semiconductor system of organic polymer, poly(3-hexylthiophene) (P3HT) and halide perovskite (CsPbBr3 and CsPb(IxBr1-x)3) nanowires (HPNWs). In samples with only HPNWs the total AE current nearly vanishes due to comparable electron-hole mobilities in these materials [2]. However, in hybrid layers, weak AE effect is observed with CsPb(IxBr1-x)3 NWs and a hole dominated AE transport with CsPbBr3 NWs. The band realignment at the heterojunction explains that while for CsPb(IxBr1-x)3 -P3HT ambipolar electron-hole transport occurs via the NWs, for CsPbBr3-P3HT, electrons are limited by low electron mobility in P3HT. References: [1] J. Phys. D: Appl. Phys. 57, 423001 (2024). [2] Nano Lett., 19, 8701-8707 (2019).
Keywords: Surface acoustic waves; Acoustoelectric effect; Organic semiconductor; Perovskites; Charge transfer states