Issue 10, 2022

Grain engineering for improved charge carrier transport in two-dimensional lead-free perovskite field-effect transistors

Abstract

Controlling crystal growth and reducing the number of grain boundaries are crucial to maximize the charge carrier transport in organic–inorganic perovskite field-effect transistors (FETs). Herein, the crystallization and growth kinetics of a Sn(II)-based 2D perovskite, using 2-thiopheneethylammonium (TEA) as the organic cation spacer, were effectively regulated by the hot-casting method. With increasing crystalline grain size, the local charge carrier mobility is found to increase moderately from 13 cm2 V−1 s−1 to 16 cm2 V−1 s−1, as inferred from terahertz (THz) spectroscopy. In contrast, the FET operation parameters, including mobility, threshold voltage, hysteresis, and subthreshold swing, improve substantially with larger grain size. The optimized 2D (TEA)2SnI4 transistor exhibits hole mobility of up to 0.34 cm2 V−1 s−1 at 295 K and a higher value of 1.8 cm2 V−1 s−1 at 100 K. Our work provides an important insight into the grain engineering of 2D perovskites for high-performance FETs.

Graphical abstract: Grain engineering for improved charge carrier transport in two-dimensional lead-free perovskite field-effect transistors

Supplementary files

Article information

Article type
Communication
Submitted
20 may 2022
Accepted
02 avq 2022
First published
09 avq 2022
This article is Open Access
Creative Commons BY license

Mater. Horiz., 2022,9, 2633-2643

Grain engineering for improved charge carrier transport in two-dimensional lead-free perovskite field-effect transistors

S. Wang, S. Frisch, H. Zhang, O. Yildiz, M. Mandal, N. Ugur, B. Jeong, C. Ramanan, D. Andrienko, H. I. Wang, M. Bonn, P. W. M. Blom, M. Kivala, W. Pisula and T. Marszalek, Mater. Horiz., 2022, 9, 2633 DOI: 10.1039/D2MH00632D

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