Light-induced reactivity of gold and hybrid perovskite as a new possible degradation mechanism in perovskite solar cells

文献情報

出版日 2017-12-20

DOI 10.1039/C7TA10217H

インパクトファクター 12.732

著者

Natalia N. Shlenskaya, Nikolai A. Belich, Michael Grätzel

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要旨

We suggest a new degradation mechanism of commonly used gold electrodes in hybrid perovskite solar cells (PSCs) originating from chemical interaction between gold and highly reactive iodine-containing byproducts formed in the course of perovskite decomposition. Intensive UV-irradiation of perovskite would typically lead to the release of volatile I2 and CH3NH3I (MAI) resulting in the formation of recently reported highly reactive polyiodide melts (RPMs) with the general formula MAI–nI2. These RPMs react aggressively with metallic gold at room temperature causing the formation of [AuI2]− and [AuI4]− complexes and, consequently, precipitation on the gold interface of a new (MA)2Au2I6 phase with a tetragonal symmetry. The high rate and depth of this reaction renders gold an easy target for attack under these particular conditions despite its notorious chemical inertness, thus making gold unsuitable for widespread use in iodine-based perovskite solar cells; other cheaper and more stable materials are needed as a better choice for further development in this area.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

Light-induced reactivity of gold and hybrid perovskite as a new possible degradation mechanism in perovskite solar cells

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Journal of Materials Chemistry A

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