N749 Black Dye, identified by its CAS Number 359415-47-7, stands as a groundbreaking ruthenium complex that has significantly advanced the field of renewable energy, particularly in the development of high-efficiency dye-sensitized solar cells (DSSCs). Often referred to simply as "black dye" or Ruthenizer 620-1H3TBA, this remarkable compound is celebrated for its ability to push the boundaries of light harvesting in photovoltaic devices. Its unique chemical structure and optical properties make it an indispensable component for researchers and manufacturers striving to enhance solar energy conversion technologies.

Chemically, N749 Black Dye is known as Tris(N,N,N-tributyl-1-butanaminium)[[2,2′′6′,2′′-terpyridine]-4,4′,4′′-tricarboxylato(3-)-N1,N1′,N1′′]tris(thiocyanato-N)hydrogen ruthenate(4-). It possesses a molecular formula of C69H117N9O6RuS3 and a molecular weight of approximately 1365.99 g/mol. Typically appearing as a green to very dark green powder, its physical form is indicative of its complex ruthenium-based structure. Purity is paramount for optimal performance in sensitive applications, with high-grade N749 Black Dye consistently exceeding 95% minimum purity. This rigorous standard ensures reliability and consistency in experimental and industrial settings.

The primary application of N749 Black Dye lies in its role as a sensitizer for wide band-gap oxide semiconductors, most notably titanium dioxide (TiO2), within DSSCs. Its unique design allows for an exceptionally wide range of spectral sensitization, effectively capturing light up to wavelengths beyond 800nm, and in some highly optimized systems, even up to 920nm. This panchromatic absorption capability is critical for maximizing the efficiency of solar cells by utilizing a broader spectrum of sunlight, including portions of the infrared region. The dye adsorbs onto the surface of the semiconductor, absorbing photons and injecting electrons into the conduction band, thereby initiating the photovoltaic process.

N749 Black Dye has demonstrated superior performance in various studies and practical applications. Its ability to achieve high certified conversion efficiencies, even reaching 11.1% when combined with high-haze TiO2 electrodes, underscores its effectiveness. This high performance is attributed to the dye's robust ruthenium complex structure and its efficient electron transfer dynamics. When prepared in solutions such as ethanol or a 1:1 mixture of acetonitrile/tert-butanol at concentrations typically ranging from 0.2-0.3mM, it facilitates optimal adsorption onto the semiconductor surface, ensuring stable and repeatable results. The exceptional spectral coverage provided by this dye contributes significantly to the overall power conversion efficiency of DSSC devices, making it a preferred choice for advanced solar energy research and manufacturing.

For any advanced material like N749 Black Dye, ensuring high quality and a consistent supply chain is crucial for both research and industrial scale-up. Reliable manufacturers prioritize meticulous synthesis and stringent quality control measures to deliver a product that meets demanding performance specifications. Those seeking a dependable supplier for N749 Black Dye will find that reputable sources emphasize purity and batch consistency, which are vital for achieving reproducible results in solar cell fabrication. Competitive prices are often available for bulk purchase, making it accessible for large-scale projects, while smaller quantities can be easily acquired for research and development. To buy this essential material, it is advisable to connect with established distributors who can offer comprehensive technical support and efficient logistics, ensuring the product arrives in optimal condition and is ready for immediate use in your innovative solar energy endeavors. The commitment to quality and service from leading suppliers ensures that the transformative potential of N749 Black Dye can be fully realized across various applications.

To maintain the integrity and performance of N749 Black Dye, proper storage is essential. It should be kept in a tightly closed container and stored in a cool and dark place, away from direct light and moisture. Adhering to these storage guidelines helps preserve the dye's chemical stability and sensitizing capabilities over time, ensuring its readiness for application in demanding photovoltaic systems.