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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 105: Focus: In-situ probes toward better understanding of hybrid halide perovskites (PhD symposium) II (joint session CPP/AKjDPG)
CPP 105.6: Vortrag
Freitag, 20. März 2020, 11:30–11:45, ZEU 222
Band structure and electronic properties of lead halide perovskites from photoemission studies — •Fengshuo Zu1,2, Patrick Amsalem1, David Egger3, Christian Wolff4, Rongbin Wang1,7, Maryline Ralaiarisoa1, Honghua Fang5, Maria Antonietta5, Dieter Neher4, Leeor Kronik6, Steffen Duhm7, and Norbert Koch1,2 — 1HU Berlin — 2HZB Berlin — 3TU Munich — 4Universität Potsdam — 5University of Groningen, Netherland — 6Weizmann Institute of Science, Israel — 7Soochow University,China
Photovoltaic devices based on halide perovskites with outstanding optoelectronic properties have exhibited tremendous progress in performance. To understand the origin of these properties comprehensively, detailed knowledge on the underlying electronic band structure is required. Here, we present complementary results from low-energy electron diffraction, angle-resolved photoelectron spectroscopy, and density functional theory calculations for CH3NH3PbBr3 and CH3NH3PbI3 single crystals. For both, sharp LEED patterns corresponding to the (001) surfaces of CH3NH3PbBr3 and CH3NH3PbI3 were observed together with well-resolved, dispersive valence band features. Furthermore, the fundamental differences between linear and logarithmic methods in determining the VB onset are discussed and addressed.[1] In addition, surface photovoltage effect, which has so far hardly been discussed in this context, is found to play significant effect in photoemission studies.[2] [1] Zu et al., J. Phys. Chem. Lett. 2019, 10, 601,[2] Zu et al., ACS Appl. Mater. Interfaces, 10.1021/acsami.9b05293.