Synthetic Metals, Journal Year: 2024, Volume and Issue: 309, P. 117780 - 117780
Published: Nov. 10, 2024
Language: Английский
ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown
Published: March 20, 2025
The integration of metal halide perovskite quantum dots (PQDs) into sensing technologies has been hindered by challenges in balancing environmental stability and sensitivity. In this work, mesoporous silica nanoparticles (MSNs) with tunable pore sizes were employed as nanoconfinement reactors to synthesize size-controlled CsPbBr3 PQDs (3.0-12.0 nm). nanoconfined environment facilitated the selective growth pure phases, avoiding unwanted Cs4PbBr6 formation. resulting PQDs, CsPbBr3@MSN, exhibited emission from blue green (470 515 nm), a high yield (36.8%), enhanced stability. Moreover, PQD composites demonstrated exceptional performance detecting pesticide dicloran, achieving detection limit 0.16 μM, far below China's national standard requirement (34.0 μM). mechanism involved competitive adsorption phase transitions cubic quasi-2D CsPb2Br5 phase. porous MSN structure maintained efficient mass energy transfer, ensuring both Beyond sensing, these nanocomposites show potential for applications anticounterfeiting fingerprint recognition. This study highlights powerful strategy developing robust, high-performance PQD-based fluorescent sensors.
Language: Английский
Citations
0
Nanomaterials, Journal Year: 2024, Volume and Issue: 14(5), P. 446 - 446
Published: Feb. 28, 2024
Calcium titanium oxide has emerged as a highly promising material for optoelectronic devices, with recent studies suggesting its potential favorable thermoelectric properties. However, current experimental observations indicate low performance, significant gap between these and theoretical predictions. Therefore, this study employs combined approach of experiments simulations to thoroughly investigate the impact structural directional differences on properties two-dimensional (2D) three-dimensional (3D) metal halide perovskites. Two-dimensional perovskites constitute focus examination in study, where an in-depth exploration their is conducted via comprehensive methodology incorporating analyses. The non-equilibrium molecular dynamics simulation (NEMD) was utilized calculate thermal conductivity perovskite material. Thermal conductivities along both in-plane out-plane directions 2D were computed. NEMD results show that 3D approximately 0.443 W/mK, while parallel vertical oriented increase n range from 0.158 W/mK 0.215 0.289 0.309 respectively. Hence, noticeably lower than ones. Furthermore, exhibit more effective blocking heat transfer behavior perpendicular reveal Seebeck coefficient reaches 3.79 × 102 µV/K. electrical only 4.55 10−5 S/cm, which one order magnitude Consequently, calculated figure merit 1.41 10−7, slightly
Language: Английский
Citations
3
Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(31), P. 20425 - 20436
Published: Jan. 1, 2024
The excellent detection performance of photodetector is realized by adjusting the energy band arrangement at interface between perovskite and electrode. optical response mechanism beyond gap limit explained.
Language: Английский
Citations
3
Nanoscale, Journal Year: 2024, Volume and Issue: 16(11), P. 5786 - 5793
Published: Jan. 1, 2024
Perovskite photodetectors (PPDs) offer a promising solution with low cost and high responsivity, addressing the limitations of traditional inorganic photodetectors. However, there is still room for improvement in terms dark current stability air-processed PPDs. In this study, 4,4',4''-tris(carbazol-9-yl)-triphenylamine (TCTA) was utilized as nucleation agent to enhance quality perovskite films. The synergistic effect TCTA moisture promotes rapid PbI2-PbCl2, resulting an increased rate elimination pinholes film. By employing additive engineering, we obtained PbI2-PbCl2 layer coverage, leading density traps corresponding Consequently, modified PPD exhibits remarkable reduction by over one order magnitude, reaching 2.4 × 10-10 A cm-2 at -10 mV, along large linear dynamic range (LDR) 183 dB. Furthermore, demonstrates stability, retaining 90% initial external quantum efficiency (EQE) value even after continuous operation 3200 hours. Owing fast response time nanosecond range, could convert modulated light signals into electrical speed 588 Kbit s-1, highlighting great potential field optical communication.
Language: Английский
Citations
1
Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown
Published: Oct. 26, 2024
Abstract Self‐powered photodetectors (PDs) have gained significant attention in recent years due to their ability operate without external power. Strengthening the built‐in electric field ( E bi ) of these devices is crucial for efficient carrier separation and transport. However, disordered energy level arrangement within mixed halide perovskites (MHP) often conflicts with levels constructed by interface, weakening thus affecting performance self‐powered PDs. In this study, a bias‐induced gradient bandgap bulk MHP proposed high‐performance photodetectors. The vector superposition interface significantly boosts device, providing powerful driving force transport photogenerated carriers. obtained device exhibits exceptional performance, including an ultra‐fast response time 1.14/1.75 µs, large specific detectivity 7.27 × 10 12 cm Hz 1/2 W −1 , ultra‐high responsivity 0.49 A quantum efficiency 93.5% at 0 V bias. Furthermore, strategy also demonstrated lateral structure photodetector. This work offers valuable guidance achieving MHP‐based PDs through optimization.
Language: Английский
Citations
1
Published: Jan. 1, 2024
Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI
Language: Английский
Citations
1
Nano Research, Journal Year: 2024, Volume and Issue: 17(7), P. 6231 - 6246
Published: April 25, 2024
Language: Английский
Citations
1
Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1002, P. 175399 - 175399
Published: June 28, 2024
Language: Английский
Citations
1
Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(37), P. 15232 - 15238
Published: Jan. 1, 2024
Direct and non-destructive transfer of large-area phase-pure two-dimensional perovskite nanosheets for the construction van der Waals heterostructures.
Language: Английский
Citations
1
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 17, 2024
Abstract Photoconductors featuring an individual micro/nano‐crystal as the photoactive channel hold great promise for next‐generation integrated optoelectronics. Meanwhile, gain aiming signal amplification without extra amplifier, fast response data transfer, and low dark current weak acquisition are highly desirable in optoelectronics, but inherent trade‐off traditional photoconductors. Herein, study demonstrates a single‐microplate MAPbI 3 photoconductor based on polyvinyl alcohol‐filled planar electrodes that can simultaneously achieve excellent performance these parameters. The superior be attributed to exquisite design of filling device gap with alcohol. This deep‐work‐function transparent alcohol not only passivate surface defects perovskite microplate by hydrogen bonding, also form heterojunction top perovskites induce depleted channel. Resultant photodetectors exhibit exceptional characteristics including ultra‐low noise‐equivalent power 0.19 fW Hz −1/2 , high specific detectivity 3.68 × 10 14 Jones, 3.2 µs, EQE‐bandwidth over 7 Hz, well stability. More importantly, photoconductors demonstrate ultra‐weak‐light imaging ability surpassing silicon counterparts. Furthermore, successful integration their pixels showcases promising prospect
Language: Английский
Citations
1