Behaviour of CuInGaSe2 solar cells under light irradiation

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Behaviour of CuInGaSe2 solar cells under light irradiation

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The behaviour of CIGS solar cells using a light irradiation test is investigated. The conversion efficiency after the test increases by ~25 %. This is mainly due to the increase in Isc and FF and the lowering of the series resistance. It is also shown that the performance of the diode decreases, because the value of the diode factor increases from 1.9 to 2.4. In addition, the changes in the junction condition and generation of defects are suggested to be based on the measurement of electro-luminescence and the photo-absorption current spectrum by the light below the sensitivity of the cell.

Inspec keywords: photoconductivity; ternary semiconductors; copper compounds; indium compounds; gallium compounds; solar cells; electroluminescence

Other keywords: solar cells; conversion efficiency; diode factor; CuInGaSe2; defect generation; light irradiation; cell sensitivity; series resistance; photoabsorption current spectrum; electroluminescence

Subjects: Photoelectric conversion; solar cells and arrays; Solar cells and arrays

References

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      • M. Contreras , B. Egaas , K. Ramanathan , K. Ramanathan , J. Hiltner , A. Swartzlander , F. Hasoon , R. Noufi . Progress toward 20% efficiency in Cu(In,Ga)Se2 polycrystallinethin-film solar cells. Prog. Photovoltaics , 4 , 311 - 316
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      • Hernandez, J.L., Rockett, A.: `Junction electroluminiscence ofCu(In,Ga)Se', Proc. 25th IEEE PVSC, May 1996, Washington, D.C., p. 973–976.
    3. 3)
      • Willett, D., Kuriyagawa, S.: `The effects of sweep rate, voltagebias and light soaking on the measurement of CIS-based solar cell characteristics', Proc. 23rd IEEE PVSC, May 1993, Kentucky, p. 495–500.
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      • M. Powalla , B. Dimmler . Scaling up issues of CIGS solar cells. Thin Solid Films , 540 - 546
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      • T. Nakada , T. Kume , A. Kunioka . Superstrate-type CuInSe2-based thin film solarcells by a low-temperature process using sodium compounds. Sol. Energy Mater. Sol. Cells , 97 - 103
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