Long-range exciton transport and slow annihilation in two-dimensional hybrid perovskites.

Abstract:

:Two-dimensional hybrid organic-inorganic perovskites with strongly bound excitons and tunable structures are desirable for optoelectronic applications. Exciton transport and annihilation are two key processes in determining device efficiencies; however, a thorough understanding of these processes is hindered by that annihilation rates are often convoluted with exciton diffusion constants. Here we employ transient absorption microscopy to disentangle quantum-well-thickness-dependent exciton diffusion and annihilation in two-dimensional perovskites, unraveling the key role of electron-hole interactions and dielectric screening. The exciton diffusion constant is found to increase with quantum-well thickness, ranging from 0.06 ± 0.03 to 0.34 ± 0.03 cm2 s-1, which leads to long-range exciton diffusion over hundreds of nanometers. The exciton annihilation rates are more than one order of magnitude lower than those found in the monolayers of transition metal dichalcogenides. The combination of long-range exciton transport and slow annihilation highlights the unique attributes of two-dimensional perovskites as an exciting class of optoelectronic materials.

journal_name

Nat Commun

journal_title

Nature communications

authors

Deng S,Shi E,Yuan L,Jin L,Dou L,Huang L

doi

10.1038/s41467-020-14403-z

subject

Has Abstract

pub_date

2020-01-31 00:00:00

pages

664

issue

1

issn

2041-1723

pii

10.1038/s41467-020-14403-z

journal_volume

11

pub_type

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