Method of testing solar cells
First Claim
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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).
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Abstract
A method of measuring the efficiency with which a solar cell converts incident photons into charge carriers, including 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 the change in the number of photons incident on the cell and the change in the number of charge carriers produced by the cell between steps (a) and (b); and (d) using the changes determined in step (c) to calculate the said efficiency measure.
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13 Claims
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1. A method of measuring incident photon to charge carrier efficiency (IPCE) of a solar cell, comprising the following steps:
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(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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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