Abstract
A device is described which incorporates a superimposed a‐c voltage signal, current‐voltage product generation, synchronous detection, and a feedback loop to bias a photovoltaic converter to its point of maximum power output. Examples of its operation as a continuous monitor of power conversion efficiency are given for p‐n junction and photoelectrochemical cells. Applications to studying the design fundamentals of the latter are illustrated, based on control derived with two‐ and three‐electrode configurations to evaluate response to efficiency determining parameters such as light intensity and mass transport in the cell. The circuit stably responds with the average values of power output under periodically interrupted light up to at least 10 Hz. These characteristics open the way to external power conversion spectroscopy in the ultraviolet to near infrared range.
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