Patent ID: 8766660
Filing Date: 2014-07-01
Classification: G01J,H02S,Y02E

Abstract:
1. A method of measuring incident photon to charge carrier efficiency (IPCE) of a solar cell, comprising the following steps: (a) illuminating the solar cell with a broadband light source; (b) illuminating the solar cell with the broadband light source of which the intensity of a selected range of wavelengths has been reduced; (c) determining a change in a number of photons incident on the solar cell and a change in a number of charge carriers produced by the solar cell between steps (a) and (b), wherein the change in the number of incident photons is determined as a change in intensity, Pin, between steps (a) and (b), and the change in the number of charge carriers is determined as a change in short circuit current density, JSC, between steps (a) and (b); and (d) using the changes determined in step (c) to calculate said efficiency measure, thereby values of Pin and JSC are used to calculate a value of the incident photon to charge carrier efficiency (IPCE).