Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 90: Perovskite and photovoltaics V (joint session HL/CPP)

CPP 90.8: Talk

Thursday, March 19, 2020, 11:45–12:00, POT 251

Manganese Doping Induced Quantum Confinement in the Perovskite Nanocrystals via Ruddlesden-Popper Defects — •Kavya Reddy Dudipala, Sharmistha Paul, Tushar Debnath, Jochen Feldmann, and Lakshminarayana Polavarapu — Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany

The concept of doping manganese ions (Mn²⁺) into II-VI semiconductor nanocrystals (NCs) has recently been extended to perovskite NCs. The transfer of the exciton energy from a semiconductor host to Mn²⁺ dopants leads to orange emission from a spin-forbidden 4T1-6A1 Mn d-d transition. To date, most studies on Mn²⁺ doped NCs focused on enhancing the emission related to the Mn²⁺ dopant via an energy transfer mechanism. Here, we show that the doping of Mn²⁺ ions into CsPbCl3 NCs not only results in a Mn²⁺-related orange emission, but also strongly influences the excitonic properties of the host NCs. We observe for the first time that Mn²⁺ doping leads to the formation of Ruddlesden-Popper defects and thus induces quantum confinement in host perovskite NCs. We find that a slight doping with Mn²⁺ ions improves the size distribution of the NCs, which results in a prominent excitonic peak. However, with increasing the Mn²⁺ concentration, the number of Ruddlesden-Popper planes increases leading to smaller single crystal domains. The enhanced confinement and crystal inhomogeneity cause a gradual blue shift and broadening of the excitonic transition.