CIGS Solar Cell Precursor Compound for Room-Temperature Solution Processing

The patent replaces the mechanical vacuum deposition system with a solution-based chemical synthesis approach. The precursor compound dissolves in solvent to form a solution that can be deposited by simple coating methods, eliminating the need for expensive vacuum equipment while maintaining high efficiency through controlled chemical reactions that form the CIGS photoactive layer.

The patent changes the physical state of the precursor from solid (requiring vacuum deposition) to dissolved solution (enabling liquid-phase processing). This parameter change allows the use of low-cost coating techniques such as spin-coating or dip-coating instead of expensive vacuum deposition, significantly reducing manufacturing costs while preserving the ability to form high-efficiency CIGS films.

The patent performs preliminary action by pre-synthesizing a stable precursor compound containing metal, dithiocarbamate, and halogen in a specific molecular structure before solution formation. This pre-organized molecular structure with defined stoichiometry prevents premature decomposition or unwanted reactions in solution, maintaining stability while preserving the simplified fabrication advantages of solution processing.

The patent creates a composite molecular structure where metal, dithiocarbamate ligand, and halogen are combined into a single stable precursor compound. This composite structure integrates multiple functional components (metal source, sulfur source, and halogen) into one stable molecule that can be handled in solution without the instability problems of separate metal-dithiocarbamate complexes.