The Type segmentation of the Photosensitive Material market distinguishes four primary sub‑categories: positive photoresist, negative photoresist, light‑sensitive polymer, and photochromic material. Positive photoresist, which becomes soluble after exposure, dominates the semiconductor lithography segment because of its high resolution and line‑edge roughness control, accounting for roughly 55 % of total type‑related revenue. Negative photoresist, which cross‑links upon exposure, finds stronger use in printed‑circuit‑board (PCB) fabrication and micro‑electromechanical systems, contributing about 25 % of type sales. Light‑sensitive polymers, employed in emerging flexible‑electronics and additive‑manufacturing processes, represent an expanding niche with an estimated 12 % share. Photochromic materials, largely confined to specialty optical filters and smart‑window applications, generate the remaining 8 % of type‑specific revenue. Collectively, these sub‑types define the market’s structural backbone, and shifts in their relative adoption directly influence the overall Photosensitive Material market size. The ongoing transition to sub‑10 nm node technologies intensifies demand for high‑performance positive resists, while the rise of organic electronics sustains polymer adoption, reinforcing the strategic relevance of each type segment.