Issue 26, 2021

Charge transfer states and carrier generation in 1D organolead iodide semiconductors

Abstract

Excited-state interactions between organic and inorganic components in hybrid metal halide semiconductors open up the possibility of moving charge and energy in deliberate ways, including energy funneling, triplet energy harvesting, or long-lived charge separation. In this work, we utilize π-conjugated naphthalene diimide electron accepting molecules to fabricate a hybrid one-dimensional (1D) lead iodide semiconductor ((NDIC2)Pb2I6) with an internal charge separating junction. Despite recent efforts on the synthesis of 1D metal halide semiconductors, little is known about their electronic structure, optical properties, and excited-state dynamics. Steady-state and time-resolved spectroscopy measurements of ((NDIC2)Pb2I6) thin films elucidate discrete optical features from the lead iodide and naphthalene diimide components of this heterostructure, along with a weakly bound optically active charge transfer state. The type-II heterojunction between the organic NDIC2 and inorganic Pb2I6 moieties facilitates rapid separation of photogenerated charges, where charge recombination is hindered by the spatial separation of charges across the organic/inorganic interface. Our study also provides some important insights into the ways in which Coulomb interactions between the organic and metal halide moieties and π–π interactions between the organic cations can affect the crystallization of these hybrid semiconductors with large, optically active π-conjugated chromophores. We believe our findings will further enable the rational design of low-dimensional organic–inorganic heterostructures where the dielectric environment, charge transfer states, and exciton behavior may be modulated.

Graphical abstract: Charge transfer states and carrier generation in 1D organolead iodide semiconductors

Supplementary files

Article information

Article type
Paper
Submitted
20 avr. 2021
Accepted
14 juin 2021
First published
15 juin 2021

J. Mater. Chem. A, 2021,9, 14977-14990

Author version available

Charge transfer states and carrier generation in 1D organolead iodide semiconductors

E. Amerling, Y. Zhai, B. W. Larson, Y. Yao, B. Fluegel, Z. Owczarczyk, H. Lu, L. Whittaker-Brooks, V. Blum and J. L. Blackburn, J. Mater. Chem. A, 2021, 9, 14977 DOI: 10.1039/D1TA03325E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements