Ultraviolet Narrowband Photomultiplication Type Organic Photodetectors with Fabry−Pérot Resonator Architecture

Abstract

Ultraviolet (UV) narrowband photodetectors play a critical role in missile detection, flame monitoring, optical communication, etc. It is a great challenge to realize UV narrowband organic photodetectors due to wide photo-harvesting property of organic materials, especially for photomultiplication type organic photodetectors (PM-OPDs). In this work, a smart strategy is proposed to achieve UV narrowband response by coupling Fabry−Pérot microcavity with PM-OPDs. PM-OPDs are realized by using poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C 71 -butyric acid methyl ester (100:1, w/w) as active layers, exhibiting broadband response range covering from UV-vis region. Series of optical microcavities consisting of Ag/LiF/ Ag with UV spectral selectivity are prepared, which are employed to couple with the PM-OPDs for achieving UV narrowband response. The UV spectral selectivity of optical microcavity can be optimized by tuning the thickness of spacer layer and mirror layers, which can further regulate the photogenerated electron distribution near Al electrode to optimize the external quantum efficiency (EQE) spectra of the PM-OPDs coupled with optical microcavity. The optimized PM-OPDs coupled with optical microcavity exhibit EQE of 9300% at 350 nm and narrowband response with 33 nm full-width at halfmaximum under −15 V bias. This work indicates that PM-OPDs coupled with optical microcavity should be an efficient strategy for achieving UV narrowband response.

Achieving 15.81% and 15.29% efficiency of all-polymer solar cells based on layer-by-layer and bulk heterojunction structures

“…† RCT represents charge transfer resistance, and ROS is associated with parasitic series resistance. [50][51][52] The all-PSCs with CN present smaller RCT and ROS, which are conducive to the more efficient charge transport in the active layers with CN. The constant phase element (CPE) is introduced to describe the non-ideal behavior of capacitors.…”

Rollable Ultraviolet Photodetector Based on ZnAl‐Layered Double Hydroxide/Polyvinylidene Fluoride Membrane

“…For example, one of the ultraviolet organic photodetectors could be demonstrated and improved UV light selectivity by coupling optical microcavity. [ 5 ] On the other hand, the inorganic wide bandgap semiconductors, such as SiC, diamond, Ga 2 O 3 , GaN, ZnS, ZnO, or ZnSe, suffer from problems, such as low sensitivity, long response time, nonlinear photocurrent with incident optical power, and a complicated fabrication process. [ 3–6 ] In addition, the fabrication of a flexible or rollable UV photodetector with sufficient durability has not been reported, despite the great significance of sustainable mechanical flexibility for the sensor in wearable sensing systems.…”

“…For example, one of the ultraviolet organic photodetectors could be demonstrated and improved UV light selectivity by coupling optical microcavity. [5] On the other hand, the inorganic wide electronic devices. [20,21] In particular, PVDF is resistant to UV radiation, enabling it to tolerate extended exposure to sunlight.…”

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bandgap semiconductors, such as SiC, diamond, Ga 2 O 3 , GaN, ZnS, ZnO, or ZnSe, suffer from problems, such as low sensitivity, long response time, nonlinear photocurrent with incident optical power, and a complicated fabrication process. [3][4][5][6] In addition, the fabrication of a flexible or rollable UV photodetector with sufficient durability has not been reported, despite the great significance of sustainable mechanical flexibility for the sensor in wearable sensing systems.Many studies have been focused on developing efficient, flexible, and highly sensitive UV photodetectors from various nanostructured materials. As an emerging nanomaterial for effective flexible photodetectors, 2D nanomaterials have attracted considerable attention because of their unique properties, such as atomic-scale thickness, lightweight, and flexibility.

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High‐Performance and High‐Stability all‐Polymer Photomultiplication‐Type Organic Photodiode Using an NDI‐Based Polymer Acceptor with Precisely Controlled Backbone Planarity

“…Photomultiplication‐type organic photodiodes (PM‐OPDs) have recently gained considerable attention due to their exceptionally high external quantum efficiency (EQE, typically higher than 10 000%), and these can be employed as effective self‐amplifying photodiodes for the detection of weak light intensity. [ 1–14 ] Significant progress has been made in the EQE, operation speed, and wavelength selectivity of PM‐OPDs based on various organic/inorganic semiconductor combinations. [ 1–6 ] The PM‐OPD operation mechanism is quite different from conventional photovoltaic devices, in that the trap‐assisted photomultiplication mechanism is artificially triggered.…”