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Thermal stability of lead-free CH3NH3SnxI3 systems (0.9 ≤ x ≤ 1.1) for photovoltaics

Dimesso, L. and Fasel, C. and Lakus-Wollny, K. and Mayer, T. and Jaegermann, W. (2017):
Thermal stability of lead-free CH3NH3SnxI3 systems (0.9 ≤ x ≤ 1.1) for photovoltaics.
In: Materials Science in Semiconductor Processing, Elsevier Science Publishing, pp. 152-158, 68, ISSN 13698001,
DOI: 10.1016/j.mssp.2017.06.012,
[Online-Edition: https://doi.org/10.1016/j.mssp.2017.06.012],
[Article]

Abstract

Methylammonium-tin-iodide (MASnxI3, 0.9 ≤ x ≤ 1.1) systems were prepared by precipitation process in aqueous solutions. The “as prepared” MASnxI3 systems exhibited a tetragonal crystalline phase (space group I4cm) with polyhedral crystallites (length 50–400 µm). The as prepared samples were annealed at T = 150 °C for t = 8 h under nitrogen and synthetic air. Under nitrogen, the CH3NH3SnxI3 systems adopt nearly-cubic tetragonal structure (space group P4mm) with crystallites of 2–4 µm length whereas a degradation process with formation of non-crystalline phases occurred in air. The differential thermal analysis (DTA) profile in nitrogen revealed events at T = 247 °C, T = 297 °C (decomposition of CH3NH3SnxI3 systems into methylamine (CH3NH2), hydroiodic acid (HI) and SnI2), and in the range T = 342–373 °C (melting of SnI2) respectively. The thermal profile in air showed endothermic events at T = 139 °C and T = 259 °C with additional events at onset temperatures of T = 337 °C and T = 423 °C respectively which correspond to the formation of Sn(IV)-O binds and to the decomposition of methylamine. Static thermogravimetry analysis (TG), performed at T = 85 °C and T = 150 °C for t = 2 h, revealed a linear weight loss as a function of the time. The optical absorption spectra displayed absorbance edges in near infrared range, at 1107.0 nm (x = 0.9), 1098.6 nm (x = 1.0) and 1073.2 nm (x = 1.1) respectively.

Item Type: Article
Erschienen: 2017
Creators: Dimesso, L. and Fasel, C. and Lakus-Wollny, K. and Mayer, T. and Jaegermann, W.
Title: Thermal stability of lead-free CH3NH3SnxI3 systems (0.9 ≤ x ≤ 1.1) for photovoltaics
Language: English
Abstract:

Methylammonium-tin-iodide (MASnxI3, 0.9 ≤ x ≤ 1.1) systems were prepared by precipitation process in aqueous solutions. The “as prepared” MASnxI3 systems exhibited a tetragonal crystalline phase (space group I4cm) with polyhedral crystallites (length 50–400 µm). The as prepared samples were annealed at T = 150 °C for t = 8 h under nitrogen and synthetic air. Under nitrogen, the CH3NH3SnxI3 systems adopt nearly-cubic tetragonal structure (space group P4mm) with crystallites of 2–4 µm length whereas a degradation process with formation of non-crystalline phases occurred in air. The differential thermal analysis (DTA) profile in nitrogen revealed events at T = 247 °C, T = 297 °C (decomposition of CH3NH3SnxI3 systems into methylamine (CH3NH2), hydroiodic acid (HI) and SnI2), and in the range T = 342–373 °C (melting of SnI2) respectively. The thermal profile in air showed endothermic events at T = 139 °C and T = 259 °C with additional events at onset temperatures of T = 337 °C and T = 423 °C respectively which correspond to the formation of Sn(IV)-O binds and to the decomposition of methylamine. Static thermogravimetry analysis (TG), performed at T = 85 °C and T = 150 °C for t = 2 h, revealed a linear weight loss as a function of the time. The optical absorption spectra displayed absorbance edges in near infrared range, at 1107.0 nm (x = 0.9), 1098.6 nm (x = 1.0) and 1073.2 nm (x = 1.1) respectively.

Journal or Publication Title: Materials Science in Semiconductor Processing
Volume: 68
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Methylammonium tin Iodide, Hybrid perovskite, Powder, Thermal Analysis, Annealing atmosphere
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 17 Jan 2018 11:38
DOI: 10.1016/j.mssp.2017.06.012
Official URL: https://doi.org/10.1016/j.mssp.2017.06.012
Funders: The authors thank the Federal Ministry of Research and Development (BMBF) (Project “Perosol” Nr. 03SF0483B) for the financial support during this work.
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