High‐Performance and Stable Plasmonic‐Functionalized Formamidinium‐Based Quasi‐2D Perovskite Photodetector for Potential Application in Optical Communication

Abstract

Photodetectors play an important role in optical communication systems and are essential to achieve high‐fidelity signal transmission. The emerging formamidinium‐based quasi‐2D layered perovskites have attracted attention in the field due to their excellent photoelectric performance and moisture stability. By optimizing film quality and device engineering a high‐performance flexible photodetector based on formamidinium‐based perovskites ((BA)2FAPb2I7) is developed, which shows fast response and excellent air‐stability. By introducing the formamidinium chloride as an additive the quality and the crystallinity of the film are improved. In addition, localized surface plasmonic resonances (LSPRs) are introduced by embedding Au nanostructures on the substrate, the LSPRs, in turn, enhance light and matter interaction, which further increases the performance of the device. The optimized devices show an ultimate response speed ≈9 µs as well as outstanding long‐term environmental stability (environmental conditions > 1000 h). Achieving such high dynamic range and stability is to the best of authors knowledge rarely reported. The device shows the highest responsivity of 2.3 A W−1, detectivity of 3.2 × 1012 Jones, and outstanding flexibility stability. Finally, the prepared photodetector is successfully integrated into an optical communication system and tested. The results suggest that formamidinium‐based quasi‐2D perovskite photodetectors have great potential in optical communication applications.

Photosensitive Dielectric 2D Perovskite Based Photodetector for Dual Wavelength Demultiplexing

“…Notably, this value is better than most 2D photodetectors. [39][40][41] In fact, due to the photogating effect, most of the low-dimensionality photodetectors cannot even keep linear dynamics. [42][43] Further, from Figure S6 (Supporting Information), it can be found the open-circuit voltage (V OC ) increases linearly with the logarithm of illumination intensity, suggesting the device is a nice photovoltaic detector.…”

Blade-coating of a highly crystallized lead-free silver-bismuth halide double perovskite thin film with improved stability for high-performance photodetection

“…, where e is the elemental charge, I d is the dark current, k B is the Boltzmann's constant, T is the temperature, and R is the resistance of the device. [72][73][74] The numerical value of the shot noise (1.41 fA Hz À1/2 ) is approximately 10 times that of the thermal noise (1.57 Â 10 À1 fA Hz À1/2 ). Thus, the thermal noise is negligible, and the i noise is dominated by the shot noise and D* can be defined as…”

Formamidinium Lead Iodide Perovskite Thin Films Formed by Two-Step Sequential Method: Solvent–Morphology Relationship

“…Organic-inorganic perovskites have emerged as a highly promising class of semiconductor for optoelectronic device applications, such as solar cells [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ], light-emitting diodes (LEDs) [ 8 , 9 , 10 , 11 ] and photodetectors [ 12 , 13 , 14 , 15 ] due to their many advantages including their low-cost, facile synthesis, solution processability, high absorption coefficient in the visible region, direct bandgap, ease of bandgap tuning and high luminescence quantum yield [ 16 ]. The power conversion efficiency (PCE) of perovskite solar cells was raised to 25.5% [ 7 ] and the external quantum efficiencies of LEDs based on perovskites exceeded 20% [ 11 ].…”