System and method for quantum efficiency measurement employing diffusive device

A system for measuring a characteristic of a solar cell, comprising:

• at least one light source irradiating at least one optical signal having a spectral range from about 100 nm to about 3000 nm;
• at least one wavelength selector configured to selectively narrow the spectral range of the optical signal;
• at least one beam splitter;
• at least one reference detector in optical communication with the beam splitter and configured to measure at least one characteristic of the optical signal;
• at least one specimen irradiated with the optical signal from the beam splitter;
• at least one diffusive device optically coupled between the beam splitter and the specimen;
• at least one diffusive detector in communication with the diffusive device and configured to measure at least one optical characteristic of light scattered by the specimen when irradiated with the optical signal;
• at least one reflectance detector in optical communication with the specimen via the diffusive device and the beam splitter, the reflectance detector configured to measure at least one optical characteristic of the optical signal reflected by the specimen;
• at least one multiplexer in communication with at least one of the reference detector, specimen, the diffusive device, the diffusive detector, and reflectance detector;
• and
• at least one processor in communication with at least one of the reference detector, specimen, the diffusive device, the diffusive detector, and reflectance detector via the multiplexer, the processor configured to calculate at least one characteristic including a quantum efficiency of the specimen based on data received from the reference detector and at least one of the specimen, the diffusive device, the diffusive detector, and reflectance detector.