Perovskite and Conjugated Polymer Wrapped Semiconducting Carbon Nanotube Hybrid Films for High-Performance Transistors and Phototransistors

Abstract

Although organic–inorganic halide perovskites continue to generate considerable interest due to great potentials for various optoelectronic devices, there are some critical obstacles to practical applications, including lead toxicity, relatively low field-effect mobility, and strong hysteresis during operation. This paper proposes a universal approach to significantly improve mobility and operational stability with reduced dual-sweep hysteresis for perovskite-based thin film transistors (TFTs) by coupling low-dimensional lead-free perovskite material (C 6 H 5 C 2 H 4 NH 3 ) 2 SnI 4 (hereafter abbreviated as (PEA) 2 SnI 4 ) with embedded conjugated polymer wrapped semiconducting carbon nanotubes (semi-CNTs). In (PEA) 2 SnI 4 /semi-CNT hybrid TFTs, semi-CNTs can provide highway-like transport paths, enabling smoother carrier transport with less trapping and scattering. We also demonstrate the performance of (PEA) 2 SnI 4 /semi-CNT hybrid phototransistors with ultrahigh photoresponsivity ( R ) of 6.3 × 10 4 A/W and detectivity ( D* ) of 1.12 × 10 17 Jones, which is about 2 or 3 orders of magnitude higher than that of the best devices available to date. The results indicate promising potentials for solution-processed perovskite/semi-CNT hybrid platforms, and the developed strategy can be applied for high-performance perovskite nanomaterial optoelectronics.