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Grain Boundary Healing of Organic-Inorganic Halide Perovskites for Moisture Stability.

08:00 EDT 14th August 2019 | BioPortfolio

Summary of "Grain Boundary Healing of Organic-Inorganic Halide Perovskites for Moisture Stability."

Although organic-inorganic halide perovskite (OIHP)-based photovoltaics have high photoconversion efficiency (PCE), their poor humidity stability prevents commercialization. To overcome this critical hurdle, focusing on the grain boundary (GB) of OIHPs, which is the main humidity penetration channel, is crucial. Herein, pressure-induced crystallization of OIHP films prepared with controlled mold geometries is demonstrated as a GB-healing technique to obtain high moisture stability. When exposed to 85% RH at 30 ℃, OIHP films fabricated by pressure-induced crystallization have enhanced moisture stability due to the enlarged OIHP grain size and low-angle GBs. The crystallographic and optical properties indicate the effect of applying pressure onto OIHP films in terms of moisture stability. The photovoltaic devices with pressure-induced crystallization exhibited dramatically stabilized performance and sustained over 0.9 normalized PCE after 200 h at 40% RH and 30 ℃.

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This article was published in the following journal.

Name: Nano letters
ISSN: 1530-6992
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Medical and Biotech [MESH] Definitions

Inorganic derivatives of ammonia by substitution of one or more hydrogen atoms with chlorine atoms or organic compounds with the general formulas R2NCl and RNCl2 (where R is an organic group).

Compounds derived from organic or inorganic acids in which at least one hydroxyl group is replaced by an –O-alkyl or other organic group. They can be represented by the structure formula RCOOR’ and are usually formed by the reaction between an acid and an alcohol with elimination of water.

SEEDS used as a major nutritional source, most often the grain from the POACEAE family.

A hardy grain crop, rye, grown in northern climates. It is the most frequent host to ergot (CLAVICEPS), the toxic fungus. Its hybrid with TRITICUM is TRITICALE, another grain.

Organic compounds that have a relatively high VAPOR PRESSURE at room temperature.

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