Patent Number: 8,797,058

Title: Solar cell characterization system with an automated continuous neutral density filter

Abstract: Techniques for solar cell electrical characterization are provided. In one aspect, a solar testing device is provided. The device includes a solar simulator; and a continuous neutral density filter in front of the solar simulator having regions of varying light attenuation levels ranging from transparent to opaque, the continuous neutral density filter having an area sufficiently large to filter all light generated by the solar simulator, and wherein a position of the continuous neutral density filter relative to the solar simulator is variable so as to control a light intensity produced by the device. A solar cell electrical characterization system and a method for performing a solar cell electrical characterization are also provided.

Inventors: Gunawan; Oki (Fair Lawn, NJ), Lei; Bao (Los Angeles, CA)

Assignee: International Business Machines Corporation

International Classification: G01R 31/26 (20140101); G01D 5/34 (20060101); H01J 1/56 (20060101)

Expiration Date: 8/05/12018