An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. It involves the measurement of the absorption, transmission, and reflection of light over a range of wavelengths. This typically focuses on wavelengths within the visible light range (between 320-1000 nm). Spectroscopic measurements are used in many different applications, such as color measurement. Image adapted from: X. “Recombination and bandgap engineering in CdSeTe/CdTe solar cells. ” APL Materials 7, 071112 (2019). Technique variations can probe bulk, surface, and interfacial dynamics of excitons, charges, and spin carriers, including transport.
[PDF Version]