Fig. 6 PL study showing the lower energetic states at the layer edges.

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Presentation transcript:

Fig. 6 PL study showing the lower energetic states at the layer edges. PL study showing the lower energetic states at the layer edges. Confocal PL mapping measurements on (C4H9NH3)2(CH3NH3)3Pb4I13 (n = 4) pero-MQWs: the PL landscape probed at (A) 1.89 eV and (B) 1.66 eV, and the (C) PL spectra of different topographical positions. Confocal PL mapping measurements on (C4H9NH3)2(CH3NH3)2Pb3I10 (n = 3) pero-MQWs: the PL landscape probed at (D) 1.95 eV and (E) 1.66 eV, and the (F) PL spectra of different topographical positions. Proposed layer ES mechanism: (G) schematics of MQW structure and (H) correlated electronic band structure. The electron-hole pairs in the bulk terrace region are tightly bonded, while at the layer edges, additional ES electrons reside, which are responsible for the detected current by the c-AFM measurement. The ES PL peak at 1.66 eV in n = 3 and 4 samples suggests that the ES has a lower optical bandgap than that in the bulk terrace region. Eg, energy bandgap. a.u., arbitrary units. Kai Wang et al. Sci Adv 2019;5:eaau3241 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).