Charge Transfer States and Carrier Generation in 1D Organolead Iodide Semiconductors

Eric Amerling, Yaxin Zhai, Bryon Larson, Yi Yao, Brian Fluegel, Zbyslaw Owczarczyk, Haipeng Lu, Luisa Whittaker-Brooks, Volker Blum, Jeffrey Blackburn

Research output: Contribution to journalArticlepeer-review

14 Scopus Citations

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 Pb2I6moieties 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.

Original languageAmerican English
Pages (from-to)14977-14990
Number of pages14
JournalJournal of Materials Chemistry A
Volume9
Issue number26
DOIs
StatePublished - 14 Jul 2021

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2021.

NREL Publication Number

  • NREL/JA-5K00-79584

Keywords

  • charge transfer
  • CHOISE
  • one-dimensional
  • perovskite
  • time-resolved spectroscopy

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