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HL: Fachverband Halbleiterphysik
HL 75: Poster IIIB
HL 75.24: Poster
Donnerstag, 19. März 2020, 15:00–17:30, P2/3OG
Time-resolved micro-photoluminescence of CuI microwires — •A. Müller1, E. Krüger1, G. Benndorf1, S. Blaurock2, V. Gottschalch2, H. Krautscheid2, C. Sturm1, and M. Grundmann1 — 1Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik — 2Universität Leipzig, Institut für Anorganische Chemie
The intrinsically p-type conducting copper iodide (CuI) with a direct band gap of 2.95 eV @ 300 K [1] and high exciton binding energy is a promising material for a variety of applications like in transparent semiconductor devices. In particular, CuI micro and nanostructures with high optical quality are well suited candidates for building blocks in integrated optoelectronic circuits. Although photoluminescence emission properties of such CuI crystals have been recently reported [2], the dynamical aspects remain almost unexplored. We report on spectral and dynamical properties of the near band gap emission of CuI microwires, grown by vapor-phase transport method [2]. At low temperatures (10 K) several excitonic emission lines are observed, proving high optical quality of the investigated microwires. The decay of the observed transitions can be modeled by biexponential decay indicating different recombination channels. Here, we focus on the dependence of the decay characteristics on the excitation conditions at low temperature (10 K) as well as their temperature dependence in the range between 10 K and 300 K.
[1] M. Grundmann et al., Phys. Status Solidi A 210, 1671 (2013)
[2] M. Wille et al., Appl. Phys. Lett. 111, 031105 (2017)