Detail publikace

Optimizing of Fast Scanning method

Originální název

Optimizing of Fast Scanning method

Anglický název

Optimizing of Fast Scanning method

Jazyk

en

Originální abstrakt

In this contribution we describe further improvement of novel diagnostic technique based on LBIC (Light Beam Induced Current) method for fast evaluation of solar cells quality. LBIC analysis is a widely used as universal method for detecting of local defects in the solar cell structure. Scanning of solar cell surface with single point light source could take several hours of processing time depending on deman-ded picture resolution. An innovative method for fast scanning of solar cells based on the LBIC measurement was proposed and tested. Instead of laser beam a linear light source consistent of multiple SMD LED diodes is used. Scanning is performed in both X and Y axes. In principle one scan in each coordinate is sufficient.The improvement of technique was done in the field of enhanced light stripe. There were tested several types of line light sources and their properties were compared. The width of line light beam is adapted to pinstripe by the help of cylindrical lens. High resolution of measurement is warranted by the exact and fast reading of measured data. There was created new advanced design of sample movement below fixed stripe of light placed in the upper part of system. The contact field with the sample is placed in the holder movable in one axis only. The contact field must be turned about 90grad for the scanning of solar cell in the second axis. The next sample holder motion is outwards. By this way the matrix of current responses is created. Data computation was made by MATLAB pro-gram. The resulting current response is influenced by all defects allocated in the actual po-sition of the actuating light beam line. Evaluation software was created for mathematic processing of measured data. The final picture of current responses over the surface of eva-luated solar cell is reconstructed from data matrix. Several mathematic methods for current map creation were tested and compared

Anglický abstrakt

In this contribution we describe further improvement of novel diagnostic technique based on LBIC (Light Beam Induced Current) method for fast evaluation of solar cells quality. LBIC analysis is a widely used as universal method for detecting of local defects in the solar cell structure. Scanning of solar cell surface with single point light source could take several hours of processing time depending on deman-ded picture resolution. An innovative method for fast scanning of solar cells based on the LBIC measurement was proposed and tested. Instead of laser beam a linear light source consistent of multiple SMD LED diodes is used. Scanning is performed in both X and Y axes. In principle one scan in each coordinate is sufficient.The improvement of technique was done in the field of enhanced light stripe. There were tested several types of line light sources and their properties were compared. The width of line light beam is adapted to pinstripe by the help of cylindrical lens. High resolution of measurement is warranted by the exact and fast reading of measured data. There was created new advanced design of sample movement below fixed stripe of light placed in the upper part of system. The contact field with the sample is placed in the holder movable in one axis only. The contact field must be turned about 90grad for the scanning of solar cell in the second axis. The next sample holder motion is outwards. By this way the matrix of current responses is created. Data computation was made by MATLAB pro-gram. The resulting current response is influenced by all defects allocated in the actual po-sition of the actuating light beam line. Evaluation software was created for mathematic processing of measured data. The final picture of current responses over the surface of eva-luated solar cell is reconstructed from data matrix. Several mathematic methods for current map creation were tested and compared

Dokumenty

BibTex


@inproceedings{BUT22632,
  author="Kristýna {Jandová}",
  title="Optimizing of Fast Scanning method",
  annote="In this contribution we describe further improvement of novel diagnostic technique based on LBIC (Light Beam Induced Current) method for fast evaluation of solar cells quality. LBIC analysis is a widely used as universal method for detecting of local defects in the solar cell structure. Scanning of solar cell surface with single point light source could take several hours of processing time depending on deman-ded picture resolution. An innovative method for fast scanning of solar cells based on the LBIC measurement was proposed and tested. Instead of laser beam a linear light source consistent of multiple SMD LED diodes is used. Scanning is performed in both X and Y axes. In principle one scan in each coordinate is sufficient.The improvement of technique was done in the field of enhanced light stripe. There were tested several types of line light sources and their properties were compared. The width of line light beam is adapted to pinstripe by the help of cylindrical lens. High resolution of measurement is warranted by the exact and fast reading of measured data.
There was created new advanced design of sample movement below fixed stripe of light placed in the upper part of system. The contact field with the sample is placed in the holder movable in one axis only. The contact field must be turned about 90grad for the scanning of solar cell in the second axis. The next sample holder motion is outwards. By this way the matrix of current responses is created.  Data computation was made by MATLAB pro-gram. The resulting current response is influenced by all defects allocated in the actual po-sition of the actuating light beam line. Evaluation software was created for mathematic processing of measured data. The final picture of current responses over the surface of eva-luated solar cell is reconstructed from data matrix. Several mathematic methods for current map creation were tested and compared
",
  address="Ing. Zdeněk Novotný Csc.",
  booktitle="Proceedings of the 13th conference - Student EEICT 2007",
  chapter="22632",
  institution="Ing. Zdeněk Novotný Csc.",
  year="2007",
  month="january",
  pages="332",
  publisher="Ing. Zdeněk Novotný Csc.",
  type="conference paper"
}