Ligand-Free Processable Perovskite Semiconductor Ink

Patent Status

Brief Description

Traditional covalent semiconductor systems, while effective, require energy-intensive and costly synthetic methods for device fabrication. To address these processing challenges, researchers at UC Berkeley have developed a stable, ligand-free zero-dimensional (0D) perovskite semiconductor ink. This ink is composed of vacancy-ordered double perovskite powders (A_2BX_6) dissolved in polar aprotic solvents like dimethyl sulfoxide (DMSO) or N,N-dimethylformamide (DMF). The process stabilizes isolated [BX_6]^{2-} octahedral anions and free A+ cations in solution without the need for organic ligands. These multi-functional inks remain stable for over a year and can be easily patterned onto various substrates—including glass and silicon—where they rapidly recrystallize into the A_2BX_6 phase upon drying.

Suggested uses

• Printable Electronics: Manufacturing thin-film transistors, diodes, and circuits using low-cost inkjet or aerosol jet printing techniques.

• Photovoltaic Cell Fabrication: Creating active layers for solar cells through scalable drop-casting, spraying, or painting methods.

• Flexible Optoelectronics: Applying semiconductor patterns to flexible substrates like wipes or plastics for wearable sensors and displays.

• Photodetector Arrays: Engineering high-sensitivity light sensors by patterning the perovskite ink into specific pixelated geometries.

• Rapid Prototyping: Utilizing the "ink-to-crystal" transformation for the quick iteration of semiconductor device designs in a laboratory or industrial setting.

Advantages

• Facile Processing: Simplifies semiconductor fabrication by enabling one-step printing and patterning at ambient pressures.

• Ligand-Free Stability: Avoids the use of insulating organic ligands, which can often hinder charge transport in the final electronic device.

• Long Shelf Life: The stabilized ionic units allow the ink to remain chemically viable for over a year, reducing material waste.

• Energy Efficient: Eliminates the need for high-temperature, vacuum-based deposition techniques common in traditional semiconductor manufacturing.

• Substrate Versatility: Demonstrates excellent adhesion and crystallization across a wide range of materials, including glass, silicon, and porous substrates.

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