Black Lithium Niobate wafer

The reduction technique is used to produce black lithium niobate (LiNbO3), which has a high ability to neutralize charges even if the electric potential occurs instantaneously. The pyroelectric effect of LN wafer is almost eliminated and the transmittance is significantly reduced. The piezoelectric properties of black lithium niobate wafers are no different from those of standard wafers. Therefore, black reduced lithium niobate wafers are widely used to produce higher frequency surface acoustic wave devices.

Free-pyro black LiNbO3 and LiTaO3 wafers were prepared successfully by chemical reduction under a mixed atmosphere of CO2 and H2. Bulk conductivity and optical transmittance of the black LiNbO3 and black LiTaO3 wafers were measured. The results showed that the pyroelectric effect for the reduced wafers was almost eliminated and the transmittance decreased considerably. The reduction process did not change Curie temperatures or piezoelectric properties of LN and LT wafers, while neutralize electrical charges even if the electrical potential occurs instantaneously.

The reduction technology is used to produce Black Lithium Niobate (LiNbO3) which has high ability to neutralize electrical charges even if the electrical potential occurs instantaneously. Black Lithium Niobate shows no difference in piezoelectric properties from standard wafers. As a result, black reduced lithium niobate wafers are widely adopted to produce higher frequency SAW devices. 

Black Lithium Niobate Wafer (Black LiNbO₃ Wafer) is a specially treated functional crystal material produced through a controlled chemical reduction process. This reduction technology significantly modifies the electrical and optical behavior of conventional Lithium Niobate, making black LN wafers an ideal solution for applications that require charge neutrality, suppression of pyroelectric effects, and high-frequency signal stability.

Lithium Niobate is well known for its strong pyroelectric and piezoelectric effects. However, in certain high-speed and high-frequency electronic or acoustic devices, the pyroelectric effect can lead to unwanted surface charges, electrical noise, and instability. By applying a reduction process under a mixed atmosphere of CO₂ and H₂, standard LN wafers are transformed into Black Lithium Niobate, which exhibits dramatically increased bulk conductivity. This allows electrical charges to be neutralized instantly, even when electrical potential appears suddenly on the crystal surface.

One of the most important advantages of Black Lithium Niobate Wafer is the near elimination of the pyroelectric effect. This means that temperature fluctuations no longer generate strong surface charges, greatly improving device reliability and operational stability. At the same time, the optical transmittance of the wafer is significantly reduced, giving the crystal its characteristic black appearance and enhancing its charge dissipation capability.

Despite these changes, the reduction process does not alter the fundamental crystal structure. The Curie temperature of Black LN remains the same as standard Lithium Niobate, and its piezoelectric properties are fully preserved. This ensures that black LN wafers maintain excellent electromechanical coupling, making them perfectly suitable for acoustic wave and sensing applications.

Black Lithium Niobate Wafers are widely used in high-frequency Surface Acoustic Wave (SAW) devices. In SAW filters, resonators, and sensors, the elimination of pyroelectric effects helps prevent signal drift, charge accumulation, and performance degradation, especially under varying thermal conditions. This makes black LN an optimal substrate for next-generation RF and microwave devices requiring high stability and low noise.

In addition to SAW technology, Black LiNbO₃ wafers are also applied in piezoelectric actuators, MEMS devices, electro-mechanical sensors, and specialized photonic systems where electrical charge control is critical. Their ability to instantly neutralize charges enhances safety, reduces interference, and extends the service life of sensitive components.

CQT provides high-quality Black Lithium Niobate Wafers and Black Lithium Tantalate Wafers manufactured through advanced chemical reduction techniques. Wafer sizes are available in 3 inch, 4 inch, and 6 inch, with full customization for crystal orientation, including X-cut, Y-cut, Z-cut, and other special cut angles. These wafers are ideal for both research and large-scale industrial production.

With superior charge neutralization capability, stable piezoelectric performance, and excellent suitability for high-frequency applications, Black Lithium Niobate Wafer has become an essential material for modern SAW devices, RF systems, and advanced electronic and acoustic technologies.