Self‐Powered MXene/GaN van der Waals Heterojunction Ultraviolet Photodiodes with Superhigh Efficiency and Stable Current Outputs

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(27)

Published: May 28, 2021

Abstract A self‐powered, high‐performance Ti 3 C 2 T x MXene/GaN van der Waals heterojunction (vdWH)‐based ultraviolet (UV) photodiode is reported. Such integration creates a Schottky junction depth that larger than the UV absorption to sufficiently separate photoinduced electron/hole pairs, boosting peak internal quantum efficiency over unity and external 99% under weak light without bias. The proposed /GaN vdWH demonstrates pronounced photoelectric performances working in self‐powered mode, including large responsivity (284 mA W −1 ), high specific detectivity (7.06 × 10 13 Jones), fast response speed (rise/decay time of 7.55 µs/1.67 ms). Furthermore, remarkable photovoltaic behavior leads an impressive power conversion 7.33% 355 nm illumination. Additionally, this work presents easy‐processing spray‐deposition route for fabrication large‐area arrays exhibit highly uniform cell‐to‐cell performance. with high‐efficiency ability show potential many applications, such as energy‐saving communication, imaging, sensing networks.

Language: Английский

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Application of Nanostructured TiO₂ in UV Photodetectors: A Review

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(28)

Published: Jan. 21, 2022

As a wide-bandgap semiconductor material, titanium dioxide (TiO2 ), which possesses three crystal polymorphs (i.e., rutile, anatase, and brookite), has gained tremendous attention as cutting-edge material for application in the environment energy fields. Based on strong attractiveness from its advantages such high stability, excellent photoelectric properties, low-cost fabrication, construction of high-performance photodetectors (PDs) based TiO2 nanostructures is being extensively developed. An elaborate microtopography device configuration most widely used strategy to achieve efficient -based PDs with performances; however, deep understanding all key parameters that influence behavior photon-generated carriers, also highly required improved performances, well their ultimate functional applications. Herein, an in-depth illustration electrical optical properties addition advances technological issues preparation, microdefects, p-type doping, bandgap engineering, heterojunctions, applications are presented. Finally, future outlook PDs, particularly further provided. This work will systematically illustrate fundamentals shed light preparation more heterojunctions

Language: Английский

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Supersaturation‐Controlled Growth of Monolithically Integrated Lead‐Free Halide Perovskite Single‐Crystalline Thin Film for High‐Sensitivity Photodetectors

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(41)

Published: Aug. 25, 2021

Abstract Monolithical integration of the promising optoelectronic material with mature and inexpensive silicon circuitry contributes to simplifying device geometry, enhancing performance, expanding new functionalities. Herein, a lead‐free halide perovskite Cs 3 Bi 2 I 9 single‐crystalline thin film (SCTF), thickness ranging from 900 nm 4.1 µm aspect ratio up 1666, is directly integrated on various substrates including Si wafer, through facile low‐temperature solution‐processing method. The growth kinetics SCTF are elucidated by in situ observation, solution supersaturation controlled reduce inverse‐temperature crystallization nucleation density elongate evaporation growth. excellent lattice match band alignment between Si(111) (001) facets promote photogenerated charge dissociation extraction, resulting boosting photoelectric sensitivity 10–200 times compared photodetectors based other substrates. More importantly, this silicon‐compatible photodetector exhibits high switching 3000 fast response 1.5 µs, which higher than most reported state‐of‐the‐art photodetectors. This work not only gives an in‐depth understanding precursor chemistry, but also demonstrates great potential monolithical wafer for high‐performance

Language: Английский

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Challenges and recent advances in photodiodes-based organic photodetectors

Materials Today, Journal Year: 2021, Volume and Issue: 51, P. 475 - 503

Published: Sept. 11, 2021

Language: Английский

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Highly Efficient and Stable Dion−Jacobson Perovskite Solar Cells Enabled by Extended π‐Conjugation of Organic Spacer

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(51)

Published: Oct. 16, 2021

2D Dion-Jacobson (DJ) perovskites have become an emerging photovoltaic material with excellent structure and environmental stability due to their lacking van der Waals gaps relative Ruddlesden-Popper perovskites. Here, a fused-thiophene-based spacer, namely TTDMAI, is successfully developed for DJ perovskite solar cells. It found that the using TTDMA spacer extended π-conjugation length exhibits high film quality, large crystal size preferred vertical orientation induced by nuclei in precursor solution, resulting lower trap density, reduced exciton binding energy oriented charge transport. As result, optimized device based on (nominal n = 4) delivers champion PCE up 18.82%. Importantly, unencapsulated can sustain average 99% of original efficiency after being stored N2 4400 h (over 6 months). Moreover, light, thermal, operational stabilities are also significantly improved comparison 3D counterparts.

Language: Английский

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Highly Dispersed Ru Nanoparticles on Boron‐Doped Ti₃C₂T_x (MXene) Nanosheets for Synergistic Enhancement of Electrocatalytic Hydrogen Evolution

Small, Journal Year: 2021, Volume and Issue: 17(38)

Published: Aug. 19, 2021

Abstract 2D‐layered materials have attracted increasing attention as low‐cost supports for developing active catalysts the hydrogen evolution reaction (HER). In addition, atomically thin Ti 3 C 2 T x (MXene) nanosheets surface termination groups (T : F, O, and OH), which are sites effective functionalization. this work, heteroatom (boron)‐doped developed an efficient solid support to host ultrasmall ruthenium (Ru) nanoparticles electrocatalytic HER. The quantum‐mechanical first‐principles calculations electrochemical tests reveal that B‐doping onto 2D MXene can largely improve intermediate H* adsorption kinetics reduce charge‐transfer resistance toward HER, leading increased reactivity of favorable electrode kinetics. Importantly, newly designed electrocatalyst based on Ru supported B‐doped (Ru@B–Ti ) shows a remarkable catalytic activity with low overpotentials 62.9 276.9 mV drive 10 100 mA cm −2 , respectively, while exhibiting excellent cycling stabilities. Moreover, according theoretical calculations, Ru@B–Ti exhibits near‐zero value Gibbs free energy (Δ G = 0.002 eV) This work introduces facile strategy functionalize use electrocatalysts.

Language: Английский

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Realization of vis–NIR Dual-Modal Circularly Polarized Light Detection in Chiral Perovskite Bulk Crystals

Journal of the American Chemical Society, Journal Year: 2021, Volume and Issue: 143(35), P. 14077 - 14082

Published: Aug. 24, 2021

Circularly polarized light (CPL)-sensitive direct detection is attracting increasing attention owing to its various optical technology applications and ultracompact device structures. However, current CPL-sensitive mainly focuses on a single mode, whereas the visible-near-infrared (vis-NIR) dual-modal detection, which important for improving sensitivity night-vision performance, still remains be explored. Here, first time, vis-NIR presented in bulk crystals of two-dimensional chiral perovskite (R-BPEA)2PbI4 (R-BPEA = (R)-1-(4-bromophenyl)ethylammonium). Benefiting from strong light-matter interaction layered structure, shows two-photon absorption (TPA) coefficient up 55 cm/MW, almost falls around highest value 2D hybrid perovskites. Notably, exhibits high detecting performance under both visible (520 nm) NIR (800 nm), with on/off ratios higher than 103, anisotropy factors photocurrent 0.1. This work will shed design new semiconductors large TPA promote their detection.

Language: Английский

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Surface Wrinkling for Flexible and Stretchable Sensors

Small, Journal Year: 2022, Volume and Issue: 18(42)

Published: Sept. 1, 2022

Recent advances in nanolithography, miniaturization, and material science, along with developments wearable electronics, are pushing the frontiers of sensor technology into large-scale fabrication highly sensitive, flexible, stretchable, multimodal detection systems. Various strategies, including surface engineering, have been developed to control electrical mechanical characteristics sensors. In particular, wrinkling provides an effective alternative for improving both sensing performance deformability flexible stretchable sensors by releasing interfacial stress, preventing failure, enlarging areas. this study, recent strategies structures applications discussed. The fundamental mechanics, geometry various fabricating methods patterns summarized. Furthermore, current state approaches their impacts on development types sensors, strain, pressure, temperature, chemical, photodetectors, reviewed. Finally, existing approaches, designs, extrapolated future applications.

Language: Английский

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Perovskite-Type 2D Materials for High-Performance Photodetectors

The Journal of Physical Chemistry Letters, Journal Year: 2022, Volume and Issue: 13(5), P. 1215 - 1225

Published: Jan. 28, 2022

Photodetectors are light sensors in widespread use image sensing, optical communication, and consumer electronics. In current smart optoelectronic technology, conventional semiconductors have encountered a bottleneck caused by inflexibility opacity. With the ever-increasing demands for versatile applications, perovskite-type 2D materials demonstrate great potential advanced photodetectors inspired molecularly thin materials. Through reduction of thickness to or levels, single-crystalline perovskites can exhibit superior performance characteristics, such as tunable absorption property chemical design, enhanced carrier separation remarkable photosensing capability, improved extraction band engineering. More importantly, large-scale monolithic integration achieve all-in-one sensing-memory-computing devices. this Perspective, recent progress perovskite-based is presented detail. The focus on growth strategies reducing thickness, thickness-dependent electrical properties, device engineering, heterojunction fabrication, performance. Finally, challenges future prospects field presented.

Language: Английский

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Ultrasensitive, flexible perovskite nanowire photodetectors with long‐term stability exceeding 5000 h

InfoMat, Journal Year: 2022, Volume and Issue: 4(9)

Published: May 4, 2022

Abstract Photodetectors (PDs) based on perovskite nanowires are among the most promising next‐generation photodetection technologies; however, their poor long‐term stability is biggest challenge limiting commercial application. Herein, an ionic liquid, 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF 4 ), incorporated as additive into methylammonium lead triiodide (MAPbI 3 ) nanowires; this not only effectively passivates defects to inhibit degradation but also leads formation of nanochannels, enabling fast charge transfer. As a result, and performance MAPbI considerably improved. The detectivity, linear detection range, noise equivalent power nanowire PD reach 2.06 × 10 13 Jones, 160 dB, 1.38 −15 W Hz −1/2 , respectively, comparable highest PDs reported date. Moreover, unencapsulated can maintain 100% its initial after being exposed open‐air environment for more than 5000 h, establishing it stable Notably, exhibits improved diffuse reflection imaging ability when compared with silicon photodiode S2386. This study provides new strategy constructing sensitive, stable, flexible will accelerate application in future. image

Language: Английский

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