Issue 5, 2024

Unveiling the role of linear alkyl organic cations in 2D layered tin halide perovskite field-effect transistors

Abstract

Two-dimensional (2D) tin halide perovskites are promising semiconductors for field-effect transistors (FETs) owing to their fascinating electronic properties. However, the correlation between the chemical nature of organic cations and charge carrier transport is still far from understanding. In this study, the influence of chain length of linear alkyl ammonium cations on film morphology, crystallinity, and charge transport in 2D tin halide perovskites is investigated. The carbon chain lengths of the organic spacers vary from propylammonium to heptanammonium. The increase of alkyl chain length leads to enhanced local charge carrier transport in the perovskite film with mobilities of up to 8 cm2 V−1 s−1, as confirmed by optical-pump terahertz spectroscopy. A similar improved macroscopic charge transport is also observed in FETs, only to the chain length of HA, due to the synergistic enhancement of film morphology and molecular organization. While the mobility increases with the temperature rise from 100 K to 200 K due to the thermally activated transport mechanism, the device performance decreases in the temperature range of 200 K to 295 K because of ion migration. These results provide guidelines on rational design principles of organic spacer cations for 2D tin halide perovskites and contribute to other optoelectronic applications.

Graphical abstract: Unveiling the role of linear alkyl organic cations in 2D layered tin halide perovskite field-effect transistors

Supplementary files

Article information

Article type
Communication
Submitted
08 Nov 2023
Accepted
22 Jan 2024
First published
07 Feb 2024
This article is Open Access
Creative Commons BY license

Mater. Horiz., 2024,11, 1177-1187

Unveiling the role of linear alkyl organic cations in 2D layered tin halide perovskite field-effect transistors

S. Wang, S. Kalyanasundaram, L. Gao, Z. Ling, Z. Zhou, M. Bonn, P. W. M. Blom, H. I. Wang, W. Pisula and T. Marszalek, Mater. Horiz., 2024, 11, 1177 DOI: 10.1039/D3MH01883K

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