Room-temperature quantum interference in single perovskite quantum dot junctions

Haining Zheng; Songjun Hou; Chenguang Xin; Qingqing Wu; Feng Jiang; Zhibing Tan; Xin Zhou; Luchun Lin; Wenxiang He; Qingmin Li; Jueting Zheng; Longyi Zhang; Junyang Liu; Yang Yang; Jia Shi; Xiaodan Zhang; Ying Zhao; Yuelong Li; Colin Lambert; Wenjing Hong

doi:10.1038/s41467-019-13389-7

Room-temperature quantum interference in single perovskite quantum dot junctions

Nat Commun. 2019 Nov 29;10(1):5458. doi: 10.1038/s41467-019-13389-7.

Authors

Haining Zheng¹, Songjun Hou², Chenguang Xin³, Qingqing Wu², Feng Jiang¹, Zhibing Tan¹, Xin Zhou³, Luchun Lin¹, Wenxiang He¹, Qingmin Li¹, Jueting Zheng¹, Longyi Zhang¹, Junyang Liu¹, Yang Yang¹, Jia Shi¹, Xiaodan Zhang³, Ying Zhao³, Yuelong Li⁴, Colin Lambert⁵, Wenjing Hong⁶

Affiliations

¹ State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, NEL, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
² Department of Physics, Lancaster University, Lancaster, LA1 4YB, UK.
³ Institute of Photoelectronic Thin Film Devices and Technology, Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Key Laboratory of Optical Information Science and Technology of Ministry of Education, Nankai University, Tianjin, 300350, China.
⁴ Institute of Photoelectronic Thin Film Devices and Technology, Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Key Laboratory of Optical Information Science and Technology of Ministry of Education, Nankai University, Tianjin, 300350, China. lyl@nankai.edu.cn.
⁵ Department of Physics, Lancaster University, Lancaster, LA1 4YB, UK. c.lambert@lancaster.ac.uk.
⁶ State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, NEL, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China. whong@xmu.edu.cn.

Abstract

The studies of quantum interference effects through bulk perovskite materials at the Ångstrom scale still remain as a major challenge. Herein, we provide the observation of room-temperature quantum interference effects in metal halide perovskite quantum dots (QDs) using the mechanically controllable break junction technique. Single-QD conductance measurements reveal that there are multiple conductance peaks for the CH₃NH₃PbBr₃ and CH₃NH₃PbBr_2.15Cl_0.85 QDs, whose displacement distributions match the lattice constant of QDs, suggesting that the gold electrodes slide through different lattice sites of the QD via Au-halogen coupling. We also observe a distinct conductance 'jump' at the end of the sliding process, which is further evidence that quantum interference effects dominate charge transport in these single-QD junctions. This conductance 'jump' is also confirmed by our theoretical calculations utilizing density functional theory combined with quantum transport theory. Our measurements and theory create a pathway to exploit quantum interference effects in quantum-controlled perovskite materials.

Publication types

Research Support, Non-U.S. Gov't