PUMA
Istituto dei materiali per l'elettronica ed il magnetismo     
Mosca R., Ferro P., Besagni T., Calestani D., Chiarella F., Licci F. Effect of humidity on the a.c. impedance of CH(3)NH(3)SnCl(3) hybrid films. In: Applied Physics A-Materials Science & Processing, vol. 104 (4) pp. 1181 - 1187. Springer-Verlag 2011, 2011.
 
 
Abstract
(English)
Impedance spectroscopy measurements show that complex conductivity of thermally ablated CH(3)NH(3)SnCl(3) films is strongly enhanced when humidity increases. Coplanar two-electrode test devices are modeled through an equivalent circuit comprising one resistance and two constant phase elements. It is shown that the influence of ambient humidity is mainly resistive. The dynamic responses of the devices to humidification/dehumidification cycles point out that the a.c. current varies by more than three orders of magnitude when humidity is varied between dry air and 80% relative humidity. The rise times are few hundred seconds while fall times are as short as few tens of seconds. This observation suggests that impedance variations are determined by mechanisms involving loosely bound water molecules physisorbed at the surface of the hybrid film. The results obtained are discussed in terms of protonic conduction.
URL: http://www.springerlink.com/content/u556q1w5j9835t62/
DOI: 10.1007/s00339-011-6407-z
Subject ORGANIC-INORGANIC PEROVSKITES
ELECTRICAL-CONDUCTIVITY
TRANSPORT-PROPERTIES
EQUIVALENT-CIRCUIT
SENSING PROPERTIES
PHASE-TRANSITION
AC-IMPEDANCE
THIN-FILMS
SENSORS
SPECTROSCOPY


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