Reflection anisotropy spectroscopy study of the near-surface electric fields in undoped,n- andp-doped low-temperature grown GaAs (001)

1998 ◽  
Vol 58 (12) ◽  
pp. 7795-7798 ◽  
Author(s):  
Todd Holden ◽  
W. D. Sun ◽  
Fred H. Pollak ◽  
J. L. Freeouf ◽  
D. McInturff ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electric Fields ◽  
Spectroscopy Study ◽  
Near Surface ◽  
Low Temperature Grown Gaas

Reflection anisotropy spectroscopy study of the near surface electric field in low-temperature grown GaAs (001)

1997 ◽  
Vol 70 (9) ◽  
pp. 1107-1109 ◽  
Author(s):  
Todd Holden ◽  
Fred H. Pollak ◽  
J. L. Freeouf ◽  
D. McInturff ◽  
J. L. Gray ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electric Field ◽  
Spectroscopy Study ◽  
Near Surface ◽  
Surface Electric Field ◽  
Low Temperature Grown Gaas

Ultrafast photoconductors from low-temperature-grown GaAs for terahertz components activated by femtosecond 1-μm wavelength laser pulses

2012 ◽  
Vol 9 (7) ◽  
pp. 1693-1695
Author(s):  
Juozas Adamonis ◽  
Klemensas Bertulis ◽  
Andrius Bičiūnas ◽  
Ramūnas Adomavičius ◽  
Arūnas Krotkus
Keyword(s):  
Low Temperature ◽  
Laser Pulses ◽  
Low Temperature Grown Gaas

Raman spectroscopy study of acetonitrile at low temperature

2021 ◽  
Vol 246 ◽  
pp. 119065
Author(s):  
Shuo Zhang ◽  
Hongsheng Jia ◽  
Mingxing Song ◽  
He Shen ◽  
Li Dongfei ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Spectroscopy Study

Interaction of localized spins in low-temperature-grown GaAs layers

2010 ◽  
Vol 405 (19) ◽  
pp. 4133-4138 ◽  
Author(s):  
D.W. Jung ◽  
J.P. Noh ◽  
N. Otsuka
Keyword(s):  
Low Temperature ◽  
Low Temperature Grown Gaas

Ohmic nanocontacts to GaAs using undoped and p-doped layers of low-temperature-grown GaAs

2000 ◽  
Vol 76 (2) ◽  
pp. 212-214 ◽  
Author(s):  
Takhee Lee ◽  
Nien-Po Chen ◽  
Jia Liu ◽  
R. P. Andres ◽  
D. B. Janes ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Grown Gaas

scholarly journals Humidity Measurement in Carbon Dioxide with Capacitive Humidity Sensors at Low Temperature and Pressure

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2615 ◽  
Author(s):  
Andreas Lorek ◽  
Jacek Majewski
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Sensor Calibration ◽  
Humidity Sensors ◽  
Near Surface ◽  
Adsorption Sites ◽  
Carbon Dioxide Gas ◽  
Individual Calibration ◽  
German Aerospace ◽  
Available Information

In experimental chambers for simulating the atmospheric near-surface conditions of Mars, or in situ measurements on Mars, the measurement of the humidity in carbon dioxide gas at low temperature and under low pressure is needed. For this purpose, polymer-based capacitive humidity sensors are used; however, these sensors are designed for measuring the humidity in the air on the Earth. The manufacturers provide only the generic calibration equation for standard environmental conditions in air, and temperature corrections of humidity signal. Because of the lack of freely available information regarding the behavior of the sensors in CO2, the range of reliable results is limited. For these reasons, capacitive humidity sensors (Sensirion SHT75) were tested at the German Aerospace Center (DLR) in its Martian Simulation Facility (MSF). The sensors were investigated in cells with a continuously humidified carbon dioxide flow, for temperatures between −70 °C and 10 °C, and pressures between 10 hPa and 1000 hPa. For 28 temperature–pressure combinations, the sensor calibration equations were calculated together with temperature–dependent formulas for the coefficients of the equations. The characteristic curves obtained from the tests in CO2 and in air were compared for selected temperature–pressure combinations. The results document a strong cross-sensitivity of the sensors to CO2 and, compared with air, a strong pressure sensitivity as well. The reason could be an interaction of the molecules of CO2 with the adsorption sites on the thin polymeric sensing layer. In these circumstances, an individual calibration for each pressure with respect to temperature is required. The performed experiments have shown that this kind of sensor can be a suitable, lightweight, and relatively inexpensive choice for applications in harsh environments such as on Mars.

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