Characterizing a photoelectric material is not a list of instruments, it is a sequence of questions, each answered by the method built for it. The chain runs from absorption through separation to reaction, and skipping a link produces stories that do not close.
UV-Vis spectroscopy, diffuse reflectance for powders, transmission for films, answers the entry question. It yields the absorption edge, from which the optical band gap follows by Tauc analysis. Everything downstream is meaningless until this is known, because excitation wavelengths are chosen from here.
Absorption coefficients and film thickness determine how many photons are actually harvested, not just where the edge lies. Two materials with the same gap can absorb different fractions of the incident light, and performance comparisons must account for it.
SPV spectroscopy takes the answer from possibility to evidence: which absorbed photons produce separated charge, in which direction it migrates, and how modifications change the picture. Transient SPV (TPV) adds the lifetime dimension.
Photoelectrochemical measurements and activity tests close the chain: photocurrents, transient photocurrents and real reaction rates show whether separated charges actually do chemistry at the surface. Materials with excellent absorption and separation but no photocurrent have a surface problem, and the chain localizes it.
Each link interprets the next: absorption data normalize SPV, SPV guides which potential conditions to test, and activity results validate the mechanism. The chain is the cheapest path from "we made a material" to "we know what it does".
Perfectlight covers the full chain: SPV systems, PEC test systems and mechanism research solutions.
