2D/3D Perovskite Photodetectors with High Response Frequency and Improved Stability Based on Thiophene-2-ethylamine and Dual Additives

Abstract

Organic−inorganic lead halide perovskite materials have received great attention in recent years. However, the poor stability of these materials severely limits the commercial application of perovskite devices. Here, we used thiophene-2ethylammonium iodide (TEAI) material as the organic spacer NH 4 SCN and NH 4 Cl as the dual additives to realize high-stability two-dimensional (2D)/three-dimensional (3D) perovskite thin films for perovskite photodetectors. Then, we investigated different effects of the dual additives on the orientation and crystallinity of the perovskite films. At room temperature, the optimized 2D/3D perovskite photodetectors exhibit good performance with high external quantum efficiency (EQE) (72%), large responsivity (0.36 A/W), high detectivity (2.46 × 10 12 Jones at the bias of 0 V), high response frequency (1.7 MHz), and improved stability (retains 90% photocurrent after 2000 h storage in RT and 10% RH conditions). Based on these devices, a dual-channel optical transport system and a light-intensity adder are achieved. The results of this study indicate that, with a simple process, the TEAI and dualadditives based 2D/3D perovskite photodetectors have promising applications in light-intensity adder and optical communication systems.

Advances and challenges in molecular engineering of 2D/3D perovskite heterostructures

“…In addition to typical PEA or BA ligands, TEA ligands have been adopted in the formation of 2D/3D heterostructures, to take advantage of interactions between S and Pb atoms to modulate the crystallization process. 131…”

Ultrafast Quasi‐2D/3D Perovskite Photodetectors Conferred Using Interfacial Engineering of Self‐Assembled Monolayers

“…Dong's group incorporated NH 4 SCN and NH 4 Cl into MAPbI 3 and thiophene-2ethylammonium-based precursors to realize high crystallization and vertical orientation. [17] Khan et al performed defect passivation using 2,7-dioctyl [1]benzothieno [3,2-b][1]benzothiophene (C 8 -BTBT). With an optimized amount of C 8 -BTBT as surface capping agents, they prolonged carrier lifetime and increased R to 0.013 A W −1 .…”