High-performance lead-free two-dimensional perovskite photo transistors assisted by ferroelectric dielectrics

Abstract

With the assistance of a ferroelectric field created by a ferroelectric polymer, the performance of perovskite photo transistors is significantly improved.

Extremely Low Dark Current MoS2 Photodetector via 2D Halide Perovskite as the Electron Reservoir

“…The X‐ray diffraction (XRD) measurement was carried out on the (PEA) 2 PbI 4 thin film on a SiO 2 substrate. (Figure c) The peaks located at (0 0 L) (L = 2, 4, 6, 8, 10, 12, 14) indicated the layered structure of the 2D perovskite film, where the long organic chain was formed by organic phenylethylammonium cations (PEA + ) and the corner‐sharing octahedra halide‐metal frames were consisted by PbI 6 − anion . No residual peaks of the PEAI or the PbI 2 were observed in the XRD diagram, and the sharp peaks indicate the good crystallization of the film.…”

“…The molecular configurations of MoS 2 and (PEA) 2 PbI 4 are presented in Figure S1a,b of the Supporting Information. It was previously reported that 2D materials were layered structure and the force between layers was van der Waals force . Raman spectrum was measured on the MoS 2 flakes to determine the thickness via energy difference between E 2g 1 and A 1g ( Figure a) .…”

“…2D OIHP (PEA) 2 PbI 4 is reported to be a p‐type semiconductor which has a layered‐stack structure constrained by van der Waals force. The special layered structure makes the 2D perovskites more stable in the air compared to their 3D counterparts . The structure‐dependent stability and simple solution‐process fabrication increase its opportunity to combine with other materials for novel optoelectronic devices.…”

Perovskite‐Based Phototransistors and Hybrid Photodetectors

“…All the photoresponse tests were carried out under the illumination of a 470 nm monochromatic light source. Reproduced with permission . Copyright 2018, Royal Society of Chemistry.…”

“…Wang et al investigated ferroelectric‐effect on performance of BGBC phototransistor (Figure d) with same 2D layered (PEA) 2 SnI 4 as channel layer in 2018 . Ferroelectric polymer poly(vinylidene fluoride‐trifluoroethylene) (P(VDF‐TrFE)) served as a dielectric insulator layer in the devices, forming three different polarization states including pristine, polarization “up,” and polarization “down,” respectively, as shown in Figure e–g.…”