Volume 59, Issue 12 pp. 4691-4697
Research Article

Guanine-Stabilized Formamidinium Lead Iodide Perovskites

Li Hong

Li Hong

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

Wuhan National Lab for Optoelectronics, Wuhan, 430074 Hubei, China

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Dr. Jovana V. Milić

Dr. Jovana V. Milić

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Paramvir Ahlawat

Paramvir Ahlawat

Laboratory of Computational Chemistry and Biochemistry, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Dr. Marko Mladenović

Dr. Marko Mladenović

Laboratory of Computational Chemistry and Biochemistry, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Dr. Dominik J. Kubicki

Dr. Dominik J. Kubicki

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

Laboratory of Magnetic Resonance, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Farzaneh Jahanabkhshi

Farzaneh Jahanabkhshi

Laboratory of Computational Chemistry and Biochemistry, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Dr. Dan Ren

Dr. Dan Ren

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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María C. Gélvez-Rueda

María C. Gélvez-Rueda

Delft University of Technology, 2629 HZ, Delft, The Netherlands

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Dr. Marco A. Ruiz-Preciado

Dr. Marco A. Ruiz-Preciado

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Dr. Amita Ummadisingu

Dr. Amita Ummadisingu

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Dr. Yuhang Liu

Dr. Yuhang Liu

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Chengbo Tian

Chengbo Tian

Wuhan National Lab for Optoelectronics, Wuhan, 430074 Hubei, China

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Linfeng Pan

Linfeng Pan

Laboratory of Photomolecular Science, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Dr. Shaik M. Zakeeruddin

Dr. Shaik M. Zakeeruddin

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Prof. Anders Hagfeldt

Prof. Anders Hagfeldt

Laboratory of Photomolecular Science, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Prof. Ferdinand C. Grozema

Prof. Ferdinand C. Grozema

Delft University of Technology, 2629 HZ, Delft, The Netherlands

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Prof. Ursula Rothlisberger

Prof. Ursula Rothlisberger

Laboratory of Computational Chemistry and Biochemistry, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Prof. Lyndon Emsley

Prof. Lyndon Emsley

Laboratory of Magnetic Resonance, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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Prof. Hongwei Han

Corresponding Author

Prof. Hongwei Han

Wuhan National Lab for Optoelectronics, Wuhan, 430074 Hubei, China

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Prof. Michael Graetzel

Corresponding Author

Prof. Michael Graetzel

Laboratory of Photonics and Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

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First published: 17 December 2019
Citations: 66

Graphical Abstract

Guanine perovskites: Stabilization of the α-FAPbI3 phase (FA=formamidinium) is realized by using guaninium (G) based G2PbI4 low-dimensional perovskites, forming heterostructures that lead to improved performances and stabilities of the corresponding solar cells. The structural properties are investigated to unravel the mode of action and set the path for using this approach in perovskite solar cell research.

Abstract

Formamidinium (FA) lead iodide perovskite materials feature promising photovoltaic performances and superior thermal stabilities. However, conversion of the perovskite α-FAPbI3 phase to the thermodynamically stable yet photovoltaically inactive δ-FAPbI3 phase compromises the photovoltaic performance. A strategy is presented to address this challenge by using low-dimensional hybrid perovskite materials comprising guaninium (G) organic spacer layers that act as stabilizers of the three-dimensional α-FAPbI3 phase. The underlying mode of interaction at the atomic level is unraveled by means of solid-state nuclear magnetic resonance spectroscopy, X-ray crystallography, transmission electron microscopy, molecular dynamics simulations, and DFT calculations. Low-dimensional-phase-containing hybrid FAPbI3 perovskite solar cells are obtained with improved performance and enhanced long-term stability.

Conflict of interest

The authors declare no conflict of interest. M.M. is also affiliated with the Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11 080 Belgrade, Serbia.

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