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Effect of illumination intensity and temperature on open circuit voltage in organic solar cells

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5 Author(s)
Kumar, P. ; Centre for Organic Electronics, National Physical Laboratory, Dr. K. S. Krishnan Road, Pusa, New Delhi-110012, India ; Jain, S.C. ; Kumar, Hemant ; Chand, S.
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The effect of illumination intensity and temperature on open circuit voltage (Voc) in organic photovoltaic devices has been investigated. Voc is observed to saturate at high illumination intensities. The illuminated J-V characteristics at different intensities intersect the dark characteristic at a single point. This intersection point is shown to be equal to the built-in voltage (Vbi) in the sample. A reduction in temperature shows increment in saturated Voc. This increment in saturated Voc is attributed to the variation of Vbi with temperature. A model has been presented that explains the observed behavior of Vbi at different temperatures.

Published in:

Applied Physics Letters  (Volume:94 ,  Issue: 18 )