Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhiping Liang,Run Hao,Hualong Luo,Zhenming He,Liumei Su,Xing Fan
Layered SnSe in nanostructures has recently attracted growing interest in photonics, optoelectronics, photocatalysis, energy storage, and biomedicine because of its suitable band gap, excellent light absorption capacity, and considerable carrier mobility. However, the applications of SnSe in high-performance photoelectrochemical (PEC) devices are greatly hindered due to high-density defects, which lead to its high recombination of charge carriers and environmental instability. In this contribution, we have adopted a doping strategy to enhance the photo-response properties of a SnSe-based PEC photodetector. The as-prepared Ga-doped SnSe nanostructure shows a remarkable increase in photocurrent density, stable on–off cyclicity, fast photo-response behavior, and higher specific detectivity compared to the pristine SnSe. Based on structure characterization, composition analysis, and DFT calculations, the substitution of Sn by Ga in the lattice gives rise to changes in the electronic structure and optical absorption, endowing Ga-doped SnSe with a metal-like feature. Such a doping strategy can provide fundamental support in the development of SnSe-based devices and pave the way for PEC applications.
研究领域:
光子学
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光电学
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光催化
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能量存储
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生物医学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·
IF 27.4
Xinwen Sun,Weiwei Meng,Kwan Ho Ngai,Zhiguo Nie,Chuhao Luan,Wenjun Zhang,Shiang Li,Xinhui Lu,Bo Wu,Guofu Zhou,Mingzhu Long,Jianbin Xu
Suppressing trap-assisted nonradiative losses through passivators is a prerequisite for efficient perovskite light-emitting diodes (PeLEDs). However, the complex bonding between passivators and perovskites severely suppresses the passivation process, which still lacks comprehensive understanding. Herein, the number, category, and degree of bonds between different functional groups and the perovskite are quantitatively assessed to study the passivation dynamics. Functional groups with high electrostatic potential and large steric hindrance prioritize strong bonding with organic cations and halides on the perfect surface, leading to suppressed coordination with bulky defects. By modulating the binding priorities and coordination capacity, hindrance from the intense interaction with perfect perovskite is significantly reduced, leading to a more direct passivation process. Consequently, the near-infrared PeLED without external light out-coupling demonstrates a record external quantum efficiency of 24.3% at a current density of 42 mA cm −2 . In addition, the device exhibits a record-level-cycle ON/OFF switching of 20 000 and ultralong half-lifetime of 1126.3 h under 5 mA cm −2 . An in-depth understanding of the passivators can offer new insights into the development of high-performance PeLEDs.
研究领域:
材料科学
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光电子学
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半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 47
·7497-7505
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IF 5.342
Jiannan Cheng,Kai Tu,Enjie He,Jinying Wang,Lifen Zhang,Zhenping Cheng,Xiulin Zhu
A new photocontrolled iodine-mediated reversible-deactivation radical polymerization (RDRP) strategy to facilely prepare main-chain-type semifluorinated alternating block copolymers was successfully established under irradiation with blue LED light at room temperature, by using a semifluorinated alternating copolymer ((AB)n, where A represents α,ω-diiodoperfluoroalkane and B represents α,ω-unconjugated diene) as a macroinitiator and chain-transfer agent, and methacrylates, acrylates and styrene as the monomers. The end group of (AB)n terminated with perfluoroalkyl iodide –(CF2)n–I can be activated by Ru(bpy)3Cl2/AsAc-Na reducing quenching catalytic cycle which generates initial carbon centered radicals (–(CF2)n˙) to initiate the polymerization under blue LED light irradiation. The polymerization can reach a reversible equilibrium through effective oxygen–iodine halogen bonding in acetone and undergo a photocontrolled iodine-mediated RDRP process. In addition, the “living” features of this photocontrolled iodine-mediated RDRP system were confirmed by polymerization kinetics and controlled “on–off” light switching cycle regulation. What's more, different types of fluoropolymers can be introduced on the copolymer chains due to the powerful designability of (AB)n. Therefore, this strategy can provide a facile and highly efficient approach to the precision synthesis of main-chain-type semifluorinated alternating di/triblock polymers under visible light irradiation.
研究领域:
高分子化学
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材料科学
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光化学
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有机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）