Berlin 2024 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 4: Perovskite and photovoltaics I (joint session HL/KFM)
KFM 4.9: Vortrag
Montag, 18. März 2024, 12:00–12:15, EW 203
Multi-Phase Optical Exciton Dynamics in Mixed (2D/3D) Inorganic-Organic Hybrid Semiconductors — •Mohammad Adnan1,2, Pawan Kumar Kanaujia2, Kshetra Mohan Dehury2, and Gaddam Vijaya Prakash2 — 1Institute of Physics, University of Münster, Wilhelm-Klemm-Straße 10 48149 Münster, Germany — 2Nanophotonics Lab, Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016 India
Inorganic-organic (IO) hybrid semiconductors are promising optoelectronic materials due to their unique crystal packing, the wide variety of crystal phases, the wide bandgap tunability and the associated optical exciton characteristics. Here, we investigate the digitized intercalation process of various organic moieties, resulting in a mixed IO hybrid system of type (R-NH3)2(R'-NH3)n-1PbnI3n+1. By employing continuous photoluminescence monitoring, we observe a progressive and dynamic structural evolution and elucidate the underlying mechanisms occurring during the intercalation process. The interplay of (i) cyclic (ii) long alkyl chain and (iii) small alkyl amine based organic moieties during the intercalation leads to the formation of either 2D ((R-NH3)2PbI4) or 3D (R'-NH3PbI3) IO hybrid networks and causes significant structural phase variations within the 2D and 3D crystal packings.
Keywords: 2D/3D perovskites; Intercalation; Photovoltaics; Crystal packing; Photoluminescence