Facile Nanogold–Perovskite Enabling Ultrasensitive Flexible Broadband Photodetector with pW Scale Detection Limit

Abstract

Flexible Broadband PhotodetectorsBroadband photodetector is a highly promising optoelectronic device, which is generally capable of detecting a broadband spectral range between ultraviolet (UV) and infrared (IR) light. Inspired by the urgent demand for various optoelectronics and wearable devices, the development of ultrasensitive

Flexible Sensors—From Materials to Applications

“…Perovskites can be divided into organic-inorganic halide perovskites following the structure ABX 3 (Figure 7a), where A is an organic cation, B is a metal cation and X is an halide anion, or inorganic only halides [272,273]. In flexible sensors, these materials have been mostly employed as active materials in photodetectors, prevalently in the form of organic-inorganic methilammonium lead bromide/iodide/chloride (CH 3 NH 3 PbX or MAPbX) [18,29,272,[274][275][276][277][278][279][280][281], and inorganic caesium lead bromide (CsPbBr 3 ) [282][283][284][285], or as piezoelectric materials such as PbZr x Ti 1-x O 3 (PZT) on ultrasound sensors [286]. The application and development of these materials for flexible optoelectronic applications has been widely researched due to their optical and electrical properties.…”

Recent developments in flexible photodetectors based on metal halide perovskite

“…Moreover, the localized surface plasmon resonance (LSPR) effect of metal nanoparticles have been used to boost light absorption or the luminescence yields of perovskite materials, thereby improving photodetection capability of PDs. Peng and co‐workers designed ultrasensitive FPDs with a metal‐semiconductor‐metal (MSM) lateral photoconductor structure, which are modified by nanogold (Au NCs) as displayed in Figure C . In this system, the detection spectra can be extended to NIR owing to the LSPR absorption effect of Au NCs.…”

“…C, Schematic representation of a nanogold‐perovskite heterostructured photodetector. Reproduced with permission . Copyright 2018, Wiley‐VCH.…”

High-Rubidium–Formamidinium-Ratio Perovskites for High-Performance Photodetection with Enhanced Stability

“…The octahedra [BX 6 ] 4– anion can be stabilized by monovalent cation A. Simply replacing the A with organic cations, such as methylammonium (CH 3 NH 3 + , MA) and formamidinium (H 2 NCHNH 2 + , FA) forms hybrid metal halide perovskites that have been vastly researched in the past few years ,− and have been successfully introduced to various platforms, e.g., solar cells, − lasers, and light-emitting diodes. ,,,− Recently, perovskite-based photodetectors have achieved unprecedented performance, − benefiting from their superior optoelectronic properties. For instance, long carrier lifetime and low recombination loss can result in high responsivity, while large carrier mobility boosts the response speed. ,,, Furthermore, the photoresponse bandwidth can be selectively modulated by tunable band gap and chemical versatility.…”

“…Recently, high-performance methylammonium lead-halide-based photodetectors have been achieved, which exhibited extremely superior detectivity, ,, low noise, and large linear dynamic range, ,,, on par with state-of-the-art silicon-based photodetectors. However, MA-based perovskites cannot withstand high temperature. ,, These perovskite thin films tend to decompose when the operating temperature is higher than 85 °C .…”