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Highly sensitive ozone and hydrogen sensors based on perovskite microcrystals directly grown on electrodes

Journal of Materiomics 2022年第2期8卷 446-453页

作者： Aikaterini Argyrou Konstantinos Brintakis Athanasia Kostopoulou Emmanouil Gagaoudakis ioanna demeridou.vassilios binas George Kiriakidis Emmanuel Stratakis Foundation for Research and Technology Hellas(FORTH) Institute of Electronic Structure&Laser(IESL)P.O.Box 1385Heraklion 70013CreteGreece University of Crete Department of Chemistry71003 HeraklionCreteGreece University of Crete Department of Physics71003 HeraklionCreteGreece Crete Center for Quantum Complexity and Nanotechnology Department of PhysicsUniversity of Crete71003 HeraklionGreece

Highly-sensitive and stable ozone and hydrogen sensing elements were fabricated based on well-crystalline rounded cube-shaped CsPbBr 3 microcrystals,synthesized by a facile solution process per-formed under ambient *** is shown that such elements demonstrate enhanced room tem-perature gas sensing ability compared to the previously reported metal halide and oxide-based *** measurements performed on these sensing components revealed high sensitivity to ultra-low ozone and hydrogen concentrations,namely 4 ppb and 1 ppm respectively,as well as a remarkable repeatability,even after a few months of storage in ambient *** ozone and hydrogen sensors were self-activated,as they did not require the use of UV or heating external stimuli to operate,and exhibited fast detection and short restoration *** such attractive properties along with the simple fabrication process could provide an easy,efficient and low-cost technology for the realization of future gas sensing devices.

关键词： All-inorganic perovskite crystals Solution process Ozone sensing Hydrogen sensing High sensitivity Room-temperature sensor Perovskite sensors

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Charge carrier dynamics in different crystal phases of CH_(3)NH_(3)PbI_(3)perovskite

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Opto-Electronic Science 2022年第4期1卷 1-10,22-27页

作者： Efthymis Serpetzoglou Ioannis Konidakis George Kourmoulakis ioanna demeridou Konstantinos Chatzimanolis Christos Zervos George Kioseoglou Emmanuel Kymakis Emmanuel Stratakis Institute of Electronic Structure and Laser(IESL) Foundation for Research and Technology-Hellas(FORTH)Herakleio 70013Greece Electrical and Computer Engineering Department Hellenic Mediterranean UniversityHerakleio 71004Greece Department of Materials Science and Technology University of CreteHerakleio 70013Greece Department of Physics University of CreteHerakleio 70013Greece.

Despite that organic-inorganic lead halide perovskites have attracted enormous scientific attention for energy conversion applications over the recent years,the influence of temperature and the type of the employed hole transport layer(HTL)on the charge carrier dynamics and recombination processes in perovskite photovoltaic devices is still largely *** particular,significant knowledge is missing on how these crucial parameters for radiative and non-radiative recombinations,as well as for efficient charge extraction vary among different perovskite crystalline phases that are induced by temperature ***,we perform micro photoluminescence(pPL)and ultrafast time resolved transient absorption spectroscopy(TAS)in Glass/Perovskite and two dierent Glass/ITO/HTL/Perovskite configurations at temperatures below room temperature,in order to probe the charge carrier dynamics of different perovskite crystalline phases,while considering also the effect of the employed HTL ***,CH_(3)NH_(3)Pbb films were deposited on Glass,PEDOT:PSS and PTAA polymers,and the developed Glass/CH_(3)NH_(3)PbI_(3)and Glass/ITO/HTL/CH_(3)NH_(3)PbI_(3)architectures were studied from 85 K up to 215 K in order to explore the charge extraction dynamics of the CH_(3)NH_(3)PbI_(3)orthorhombic and tetragonal crystalline *** is observed an unusual blueshift of the bandgap with temperature and the dual emission at temperature below of 100 K and also,that the charge carrier dynamics,as expressed by hole injection times and free carrier recombination rates,are strongly depended on the actual pervoskite crystal phase,as well as,from the selected hole transport material.

关键词： transient absorption spectroscopy p-photoluminescence variable temperature perovskite crystalline phases hole transport layer charge carrier dynamics

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