Flexible Ultrathin Single-Crystalline Perovskite Photodetector

Abstract

Flexible optoelectronic devices attract considerable attention due to their prominent role in creating novel wearable apparatus for bionics, robotics, health care, and so forth. Although bulk single-crystalline perovskite-based materials are well-recognized for the high photoelectric conversion efficiency than the polycrystalline ones, their stiff and brittle nature unfortunately prohibits their application for flexible devices. Here, we introduce ultrathin single-crystalline perovskite film as the active layer and demonstrate a high-performance flexible photodetector with prevailing bending reliability. With a muchreduced thickness of 20 nm, the photodetector made of this ultrathin film can achieve a significantly increased responsivity as 5600A/W, 2 orders of magnitude higher than that of recently reported flexible perovskite photodetectors. The demonstrated 0.2 MHz 3 dB bandwidth further paves the way for high-speed photodetection. Notably, all its optoelectronic characteristics resume after being bent over thousands of times. These results manifest the great potential of single-crystalline perovskite ultrathin films for developing wearable and flexible optoelectronic devices.

2D/3D Halide Perovskites for Optoelectronic Devices

“…In addition, the unique structure and properties of 2D layered perovskites, such as quantum confinement effects and bandgap tunability, make them tunable photo responses. As a direct bandgap semiconductor, the 2D perovskite material has a high absorption coefficient, a high quantum yield, and a continuous adjustable band gap in the visible spectrum, so it shows a high application value in the photodetector ( An et al, 2013 ; Tan et al, 2016 ; Li et al, 2020 ; Jing et al, 2020 ; Wang et al, 2021 ; Li et al, 2021 ). The organic composition of the 2D layered perovskite provides a structural diversity compared to conventional 3D perovskites.…”

Flexible Image Sensors with Semiconducting Nanowires for Biomimic Visual Applications

“…[38][39][40][41][42][43][44][45] In addition, for high-performance flexible photodetection, a single device should yield excellent mechanical flexibility and good sensing performance at the same time, which results in a huge challenge in material selection. [46][47][48][49][50][51][52] A few traditional semiconductors with good properties, such as suitable bandgaps, have been used as photosensitive materials to construct flexible photodetectors. [53][54][55][56] In the past few years, a variety of functional materials have been studied for applications in flexible photodetectors, including materials with perovskite structures, organic semiconductors, 0D nanostructures, 1D inorganic nanostructures (such as nanotubes, nanorods, nanobelts, and nanowires [NWs]), and 2D-layered materials.…”

Flexible Phase Change Materials for Electrically‐Tuned Active Absorbers

“…[ 34 ] Owing to the elastic deformability of flexible substrates, these devices can be mechanically deformed (bent, stretched, twisted, compressed, etc.) and work on curved surfaces, inspiring applications such as flexible optical metasurfaces, [ 35–37 ] wearable photonic healthcare devices, [ 38 ] flexible photodetectors, [ 39 ] chemical and biological sensors, [ 40,41 ] and so on. Moreover, mechanical deformation can also be regarded as an extra degree of freedom for optical metasurfaces.…”

“…By controlling different deformation states of flexible substrates, tunable [ 42 ] and multiplexed [ 43 ] metasurfaces have been demonstrated at visible frequencies. The most widely used flexible substrates are polymer materials such as polydimethylsiloxane (PDMS), [ 36 ] polystyrene (PS), [ 37 ] polyimide (PI), [ 38 ] polyethylene terephthalate (PET), [ 39 ] polyethylene glycol (PEG), [ 40 ] and polycarbonate (PC). [ 41 ] However, owing to thermal instability, these flexible polymer substrates can only operate below the temperature of 500 K, [ 44 ] which is contrary to the above‐mentioned high‐temperature requirements of PCMs.…”