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Chemical vapor deposition growth of Phase-selective inorganic lead halide perovskite films for sensitive photodetectors

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Chinese Chemical Letters 2021年第1期32卷 489-492页

作者： Weilong Xu Mengsi Niu Xiaoyu Yang Haiyue Chen Xiaohong Cai Trevor A.Smith Kenneth PGhiggino Xiaotao Hao School of Photoelectric Engineering Changzhou Institute of TechnologyChangzhou 213002China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJi'nan 250100China ARC Centre of Excellence in Exciton Science School of ChemistryThe University of MelbourneParkvilleVictoria 3010Australia

Inorganic lead halide perovskites are attractive optoelectronic materials owing to their relative stability compared to organic cation alternatives.The chemical vapor deposition(CVD) method offers potential for high quality perovskite film growth.The deposition temperature is a critical parameter determining the film quality owing to the melting difference between the precursors.Here,perovskite films were deposited by the CVD method at various temperatures between 500-800℃.The perovskite phase converts from CsPb_(2)Br_(5) to CsPbBr_(3) gradually as the deposition temperature is increased.The grain size of the perovskite films also increases with temperature.The phase transition mechanism was clarified.The photoexcited state dynamics were investigated by spatially and temporally resolved fluorescence measurements.The perovskite film deposited under 750℃ condition is of the CsPbBr_(3) phase,showing low trap-state density and large crystalline grain size.A photodetector based on perovskite films shows high photocurrent and an on/off ratio of ~2.5×10^(4).

关键词： Chemical vapor deposition Inorganic perovskite Phase-selective Photodetector Photophysical dynamics

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Phase-selective Gelators: Synthesis,Self-assembly,and Applications

Phase-selective Gelators: Synthesis,Self-assembly,and Applic...

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中国化学会全国第十二届有机合成化学学术研讨会

作者： Xia,Rui Jie,Jing Song,Jie-Fang Zhang,Xin Yu,Hai-Tao College of Chemistry and Materials Science Hebei Normal University

Water pollution is an environmental issue of world-wide focus.Removal of contaminants from water is a very important research area.Aniline and nitrobenzene are important materials in organic industry,which are very poisonous not only to human body but also to animals and microorganisms.The waste water containing aniline or nitrobenzene has become the key treatment target of each country all over the world.The current methods for the treatment of such organic liquid involve adsorbents,polymeric solidifiers,chemical dispersants,and microbials.However,each approach has its own limitation in practice,such as complicated and expensive post-treatment process,toxicity to ecology,difficulty in recovery.So the development of eco-friend,easy-to-operate,low-cost,easy recovered material for the purification of aniline-containing water become in great demand.Phase-selective gelators（PSGs） that prefer to gelate one solvent rather than gel the other in a given biphasic mixture,have been actively studied on water purification and the oil spill recovery from water.However,to the best of our knowledge,Phase-selective organogelators which can remove either organic-layer or water-dissolved aniline from an aniline/water mixture are rarely reported.Several effective PSGs have been developed for the removal of aniline or nitrobenzene from their biphasic mixtures with water via a simple shaking strategy at room temperature.The morphologies of the gels formed in aniline and nitrobenzene in the absence or presence of a large amount of water have been examined by field emission scanning electron microscopy（FE-SEM）.The dominant factors that drive gelation in the case of the gelator and aniline or nitrobenzene have been studied using FT-IR,concentration-dependent 1H NMR,and XRD.Besides,the efficient purification of toxic dye solutions has been realized by using one of these gelators as the adsorbent in the applied form of gel column.And the corresponding xerogel can also be used for the efficient dye removal.The easy-to-implement performance

关键词： Organogelator Phase-selective water contamination water purification

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