Synthesis Protocols for Solar Cell Materials from Laboratory Fabrication to Scalable Manufacturing

Photovoltaic (PV) technology has evolved over seven decades from single-crystal silicon cells with modest efficiencies to a diverse portfolio of silicon, thin-film, and emerging solar-cell architectures approaching or exceeding thermodynamic single-junction limits when combined in tandem configurations. Device efficiency and long-term operational stability are governed not only by the choice of absorber material but, critically, by the synthesis protocol used to fabricate it the crystal-growth method, deposition technique, solvent system, thermal budget, and interface-engineering strategy all leave a lasting imprint on morphology, defect density, and carrier transport. This review provides a comprehensive, protocol-centered survey of solar-cell synthesis across three technology generations: silicon wafer-based cells, thin-film cells (CdTe, CIGS, amorphous silicon), and emerging solution- and vapor-processed cells (perovskite, organic, dye-sensitized, and quantum-dot). We further examine the processing parameters materials and precursor engineering, thermal and environmental control, and interface/surface engineering that link synthesis to structure and, ultimately, to performance. A dedicated discussion of scale-up addresses roll-to-roll and slot-die manufacturing, stability and reproducibility, environmental and toxicity considerations, and the emerging role of artificial intelligence and automation in synthesis optimization. Compared with prior single-technology reviews, this work integrates the full synthesis landscape within one processing–structure–performance framework and closes with a forward-looking roadmap for translating laboratory protocols into industrially viable manufacturing lines.