Electrical tunability of inorganic tin perovskites enabled by organic modifiers

Md Azimul Haque, Tong Zhu, Luis Huerta Hernandez, Roba Tounesi, Craig Combe, Bambar Davaasuren, Abdul Hamid Emwas, F. Pelayo García de Arquer, Edward H. Sargent, Derya Baran*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Achieving control over the transport properties of charge carriers is a crucial aspect of realizing high-performance electronic materials. In metal-halide perovskites, which offer convenient manufacturing traits and tunability for certain optoelectronic applications, this is challenging: the perovskite structure itself poses fundamental limits to maximum dopant incorporation. Here, we demonstrate an organic modifier incorporation strategy capable of modulating the electronic density of states in halide tin perovskites without altering the perovskite lattice, in a similar fashion to substitutional doping in traditional semiconductors. By incorporating organic small molecules and conjugated polymers into cesium tin iodide (CsSnI3) perovskites, we achieve carrier density tunability over 2.7 decades, transition from a temperature-dependent semiconducting to a metallic nature, and high electrical conductivity exceeding 200 S/cm. We leverage these tunable and enhanced electronic properties to achieve a thin-film, lead-free, thermoelectric material with a near room temperature figure of merit of 0.21.

Original languageEnglish (US)
Article number101703
JournalCell Reports Physical Science
Volume4
Issue number12
DOIs
StatePublished - Dec 20 2023

Keywords

  • charge transport
  • electrical properties
  • halide perovskite
  • thermoelectrics

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • General Engineering
  • General Energy
  • General Physics and Astronomy

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