Metal halide perovskites are a class of materials that are ideal for photodetectors and solar cells due to their excellent optoelectronic properties.Their low-cost and low temperature synthesis have made them attracti...Metal halide perovskites are a class of materials that are ideal for photodetectors and solar cells due to their excellent optoelectronic properties.Their low-cost and low temperature synthesis have made them attractive for extensive research aimed at revolutionizing the semiconductor industry.The rich chemistry of metal halide perovskites allows compositional engineering resulting in facile tuning of the desired optoelectronic properties.Moreover,using different experimental synth-esis and deposition techniques such as solution processing,chemical vapor deposition and hot-injection methods,the dimensionality of the perovskites can be altered from 3D to 0D,each structure opening a new realm of applications due to their unique properties.Dimensionality engineering includes both morphological engineering reducing the thickness of 3D perovskite into atomically thin films and molecular engineering--incorporating long-chain organic cations into the perovskite mixture and changing the composition at the molecular level.The optoelectronic properties of the perovskite structure including its band gap,binding energy and carrier mobility depend on both its composition and dimensionality.The plethora of different photodetectors and solar cells that have been made with different compositions and dimensions of perovskite will be reviewed here.We will conclude our review by discussing the kinetics and dynamics of different dimen-sionalities,their inherent stability and toxicity issues,and how reaching similar performance to 3D in lower dimensionalities and their large-scale deployment can be achieved.展开更多
This paper studies gas detectors, especially, gas sensors in which a thermochemical reac-tion takes place on a catalytic element. The novel catalytic sensor is fabricated using micro-electronic thick-film techniques, ...This paper studies gas detectors, especially, gas sensors in which a thermochemical reac-tion takes place on a catalytic element. The novel catalytic sensor is fabricated using micro-electronic thick-film techniques, and it is used to monitor the concentration of combustiblegases and their mixture in a flow reactor. This sensor has two identical platinum films whichare used as the heater, resistance thermometer and the surface of reaction. Catalyst of palla-dium is deposited on one of the platinum film by chemical method, while the other platinumfilm serves as a compensating element. The difference in the minimum reaction temperaturefor the catalytic oxidation of the combustible gas components of mixture by palladium sug-gests that it is possible to analyse such a gas mixture. The purpose of the study is to demon-strate that the sensor fabricated by this process has good sensing characteristics for hydrogenor carbon monoxide gas in the mixture of methane and ethane.展开更多
文摘Metal halide perovskites are a class of materials that are ideal for photodetectors and solar cells due to their excellent optoelectronic properties.Their low-cost and low temperature synthesis have made them attractive for extensive research aimed at revolutionizing the semiconductor industry.The rich chemistry of metal halide perovskites allows compositional engineering resulting in facile tuning of the desired optoelectronic properties.Moreover,using different experimental synth-esis and deposition techniques such as solution processing,chemical vapor deposition and hot-injection methods,the dimensionality of the perovskites can be altered from 3D to 0D,each structure opening a new realm of applications due to their unique properties.Dimensionality engineering includes both morphological engineering reducing the thickness of 3D perovskite into atomically thin films and molecular engineering--incorporating long-chain organic cations into the perovskite mixture and changing the composition at the molecular level.The optoelectronic properties of the perovskite structure including its band gap,binding energy and carrier mobility depend on both its composition and dimensionality.The plethora of different photodetectors and solar cells that have been made with different compositions and dimensions of perovskite will be reviewed here.We will conclude our review by discussing the kinetics and dynamics of different dimen-sionalities,their inherent stability and toxicity issues,and how reaching similar performance to 3D in lower dimensionalities and their large-scale deployment can be achieved.
基金Project supported by the National Natural Science Foundation of China and the Edison Sensor Tech. Center, Dept of Development of the State of Ohio, USA.
文摘This paper studies gas detectors, especially, gas sensors in which a thermochemical reac-tion takes place on a catalytic element. The novel catalytic sensor is fabricated using micro-electronic thick-film techniques, and it is used to monitor the concentration of combustiblegases and their mixture in a flow reactor. This sensor has two identical platinum films whichare used as the heater, resistance thermometer and the surface of reaction. Catalyst of palla-dium is deposited on one of the platinum film by chemical method, while the other platinumfilm serves as a compensating element. The difference in the minimum reaction temperaturefor the catalytic oxidation of the combustible gas components of mixture by palladium sug-gests that it is possible to analyse such a gas mixture. The purpose of the study is to demon-strate that the sensor fabricated by this process has good sensing characteristics for hydrogenor carbon monoxide gas in the mixture of methane and ethane.
