Self-Powered and Low-Noise Perovskite Photodetector Enabled by a Novel Dopant-Free Hole-Transport Material with Bottom Passivation for Underwater Blue Light Communications

Abstract

Designing dopant-free hole-transport materials (HTMs) is a facile and effective strategy to realize highperformance organic−inorganic hybrid perovskite (OIHP) photodetectors. Herein, a novel phenothiazine polymer, poly[4-(10Hphenothiazin-10-yl)-N,N-bis(4-methoxyphenyl)aniline] (PPZ-TPA), was synthesized and employed as a promising HTM in OIHP photodetectors. The triphenylamine donor unit was combined with a phenothiazine core, furnishing the polymer with a suitable highest occupied molecular orbital level, favorable thermal stability, and appropriate film morphology. The sulfur atom in the phenothiazine functional group can intentionally passivate the undercoordinated Pb 2+ of OIHP films, suppressing nonradiative recombination and yielding an ultralow dark current density of 1.26 × 10 −7 A cm −2 under −0.1 V, as well as a low-noise current of 3.75 × 10 −13 A Hz −1/2 at 70 Hz. Encouragingly, the self-powered PPZ-TPA-based OIHP photodetectors were successfully integrated into a blue light communication system for the first time, demonstrating their application for receiving and transmitting light signals with a transmission rate of 300 bps. In addition, the PPZ-TPA-based devices exhibit nearly 1 year shelf stability without obvious degradation. We believe that PPZ-TPA demonstrates great potential to achieve high-performance perovskite photodetectors, also providing a strategy for the design of novel HTMs.

Engineering Metal–Organic Frameworks with Tunable Colors for High-Performance Wireless Communication

“…This is due to the shortage of available RF spectra and limited bandwidth . Optical wireless communications (OWCs), on the other hand, offer unlicensed and secure full spectral bandwidths ranging from ultraviolet (UV) to infrared, providing a new pathway for achieving uninhibited growth in high-speed and low-latency data transmission. − However, conventional color-converting phosphors used in high-speed OWCs are based solely on ceramic or perovskite materials, which are composed of environmentally unfriendly elements, and require harsh synthesis conditions with a high fabrication cost, significantly limiting their commercialization potential. ,,− …”

Bi2O3 Layer‐Integrated, Double‐Sided Responsive, Waveband‐Discriminated Perovskite Photodetector for Encrypted Optical Communication

“…[ 1–4 ] By virtue of large capacity and high transmission rate, the emerging technology has achieved great success in intelligent transportation, underwater exploration, position monitoring, and military defense. [ 5–7 ] Nevertheless, light wave with open channels inevitably scatter and refract during transmission, causing severe data leakage. [ 8,9 ] Traditional data protection is carried out by complicated algorithms, susceptible to being obsessed with programming vulnerability and attack by the external virus.…”

Bandgap-tuned barium bismuth niobate double perovskite for self-powered photodetectors with a full-spectrum response

“…[1][2][3][4][5] Novel semiconducting materials are promising materials to fulfill the requirements of self-powered photodetectors, e.g., high responsivity and detectivity, fast response speed, low noise current, and large linear dynamic range. [6][7][8][9] Double perovskite materials A 2 BB 0 X 6 (X = O, Cl, Br, and I), whose A cations are surrounded by an alternating network of BX 6 and B 0 X 6 octahedra, are considered as an interesting class of materials due to their structural and compositional flexibility. To date, various strategies such as A-site doping by organic and inorganic species, B and B 0 site substitution by different oxidation states of a metal, as well as a variation of the halide composition in the X-site have been proposed to manipulate the bandgap of halide double perovskites A 2 BB 0 X 6 (X = Cl, Br, and I), which significantly promote their applications in photovoltaics and optoelectronics.…”