Silicon phthalocyanine dichloride is primarily utilized in advanced materials and technologies due to its unique photophysical and electrochemical properties. It is widely applied in the development of organic semiconductors, where it enhances charge transport and stability in electronic devices such as organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). Its strong absorption in the visible and near-infrared regions makes it a valuable component in dye-sensitized solar cells (DSSCs), improving light-harvesting efficiency.

In the field of photodynamic therapy (PDT), this compound serves as a photosensitizer for cancer treatment. When exposed to light, it generates reactive oxygen species (ROS) that selectively destroy cancer cells while minimizing damage to healthy tissues. Additionally, its luminescent properties are exploited in optical sensors and imaging agents, enabling precise detection and visualization of biological molecules or environmental pollutants. Silicon phthalocyanine dichloride is also explored in nonlinear optics for applications like optical limiting and data storage, leveraging its ability to modulate light under specific conditions.