Temperature dependent optical properties of CH3NH3PbI3                         perovskite by spectroscopic ellipsometry

Yajie Jiang; Arman Mahboubi Soufiani; Angus Gentle; Fuzhi Huang; Anita Ho-Baillie; Martin A. Green

doi:10.1063/1.4941710

Temperature dependent optical properties of CH₃NH₃PbI₃ perovskite by spectroscopic ellipsometry

Yajie Jiang^*, Arman Mahboubi Soufiani, Angus Gentle, Fuzhi Huang, Anita Ho-Baillie, Martin A. Green

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Mixed organic-inorganic halide perovskites have emerged as a promising new class of semiconductors for photovoltaics with excellent light harvesting properties. Thorough understanding of the optical properties of these materials is important for photovoltaic device optimization and the insight this provides for the knowledge of energy band structures. Here we present an investigation of the sub-room temperature dependent optical properties of polycrystalline thin films of CH₃NH₃PbI₃ perovskites that are of increasing interest for photovoltaics. The complex dielectric function of CH₃NH₃PbI₃ in the energy range of 0.5-4.1 eV is determined between 77 K and 297 K using spectroscopic ellipsometry. An increase in optical permittivity as the temperature decreases is illustrated for CH₃NH₃PbI₃. Optical transitions and critical points were analyzed using the energy dependent second derivative of these dielectric functions as a function of temperature.

Original language	English
Article number	061905
Pages (from-to)	1-5
Number of pages	5
Journal	Applied Physics Letters
Volume	108
Issue number	6
DOIs	https://doi.org/10.1063/1.4941710
Publication status	Published - 8 Feb 2016
Externally published	Yes

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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters 108(6), 061905 (2016) and may be found at https://doi.org/10.1063/1.4941710.

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title = "Temperature dependent optical properties of CH3NH3PbI3 perovskite by spectroscopic ellipsometry",

abstract = " Mixed organic-inorganic halide perovskites have emerged as a promising new class of semiconductors for photovoltaics with excellent light harvesting properties. Thorough understanding of the optical properties of these materials is important for photovoltaic device optimization and the insight this provides for the knowledge of energy band structures. Here we present an investigation of the sub-room temperature dependent optical properties of polycrystalline thin films of CH3NH3PbI3 perovskites that are of increasing interest for photovoltaics. The complex dielectric function of CH3NH3PbI3 in the energy range of 0.5-4.1 eV is determined between 77 K and 297 K using spectroscopic ellipsometry. An increase in optical permittivity as the temperature decreases is illustrated for CH3NH3PbI3. Optical transitions and critical points were analyzed using the energy dependent second derivative of these dielectric functions as a function of temperature. ",

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AU - Ho-Baillie, Anita

AU - Green, Martin A.

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Temperature dependent optical properties of CH₃NH₃PbI₃ perovskite by spectroscopic ellipsometry

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