Description
This study investigates the influence of ultraviolet (UV) and visible light on the structural ordering of N2200 thin films doped with spiropyran, using absorbance analysis. Structural ordering is closely linked to the optoelectronic properties of the material. Thin films annealed for 20 minutes were examined, as literature reports that this annealing duration yields the highest degree of structural ordering, with density of states of 1.1–1.2 g/cm³ and a carrier density of 10¹⁰–10¹³ cm⁻³. Samples were analyzed both in their pristine state and after doping with spiropyran. Portions of the doped samples were exposed to UV light, while others were exposed to visible light, both for 5 minutes. The results reveal systematic variations in absorbance among doped, UV-irradiated, and visible-light-irradiated films, indicating continuous changes in molecular conformation and structural ordering. These changes significantly affect the optoelectronic properties of the thin films, demonstrating the sensitivity of the material system to chemical doping as well as UV and visible light exposure.