FAST CELLO MEASUREMENTS FOR DEFECT IDENTIFICATION AND LOSS QUANTIFICATION OF SOLAR CELLS

摘要

The speed of CELLO (solar CEL1 LOcal characterization) measurements has been increased drastically by a complete redesign of the hardware, allowing now for measuring 1000 points per second routinely. Examples of such fast measurements are presented and possibilities for identifying local defect types and quantifying their influence on the solar cell efficiency are discussed. Reducing the lateral resolution by defocusing the LASER beam still allows to correctly identify various defect structures and to obtain quantitative values for, e.g., resistances, within a few seconds. Strategies for reducing the measurement time to < 1 sec. are discussed, which would allow for using CELLO as an in-line control tool.