NDLI: Thermoanalytical study of precursors for tin sulfide thin films deposited by chemical spray pyrolysis

Content Provider	Springer Nature Link
Author	Polivtseva, S. Oja Acik, I. Krunks, M. Tõnsuaadu, K. Mere, A.
Copyright Year	2015
Abstract	Thermal decomposition of precursors for SnS thin films obtained by drying aqueous solutions of SnCl$_{2}$ and SC(NH$_{2}$)$_{2}$ in the Sn:S molar ratios of 1:1 (1) and 1:8 (2) was monitored by simultaneous thermogravimetry/differential thermal analysis (TG/DTA) measurements in the dynamic 80 % Ar + 20 % O$_{2}$ atmosphere. The evolved gaseous species from 1 were recorded by simultaneous thermogravimetry/differential thermal analysis/evolved gas analysis–mass spectrometry (TG/DTA/EGA-MS) measurements. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the dried precursors and products of the thermal decomposition. The precursor 1 is a complex compound, Sn(tu)Cl$_{2}$, while 2 consists of Sn$_{2}$(tu)$_{5}$Cl$_{4}$·H$_{2}$O and noncomplexed thiourea. The thermal degradation of 1 and 2 in the temperature range of 30–700 °C consists of four steps with a total mass loss of 68.0 and 84.5 %, respectively. According to XRD, the solid decomposition products at 210 °C of 1 are SnS$_{2}$, (NH$_{4}$)$_{2}$SnCl$_{6}$ and C(NH$_{2}$)$_{3}$SnCl$_{3}$, and of 2 are SnS$_{2}$, SnS, NH$_{4}$Cl and (NH$_{4}$)$_{2}$SnCl$_{6}$. Decomposition of 1 and 2 is completed by 550 and 570 °C, respectively. The final decomposition product of 1 and 2 at 700 °C is SnO$_{2}$. This study shows that the excess of thiourea in the spray solution, compared to that required for the formation of the intermediate tin complex compounds, suppresses the formation of tin oxide phase and depresses the loss of tin species from the system.
Starting Page	177
Ending Page	185
Page Count	9
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	121
Issue Number	1
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-03-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Simultaneous thermogravimetry (TG) and differential thermal analysis (DTA) Evolved gas analysis (EGA) Mass spectroscopy (MS) Tin sulfide Thiourea Chemical spray pyrolysis (CSP) Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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