Open circuit voltage and IV curve shape of ZnPc:C<sub>60</sub> solar cells with varied mixing ratio and hole transport layer

Wolfgang R. Tress; Steffen Pfützner; Karl Leo; Moritz K. Riede

doi:10.1117/1.3556726

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1 January 2011 Open circuit voltage and IV curve shape of ZnPc:C₆₀ solar cells with varied mixing ratio and hole transport layer

Wolfgang R. Tress, Steffen Pfützner, Karl Leo, Moritz K. Riede

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J. of Photonics for Energy, 1(1), 011114 (2011). https://doi.org/10.1117/1.3556726

Abstract

In this contribution the effect of changes in the active material system and modification of contact properties in organic solar cells is investigated at the example of ZnPc:C₆₀ small molecule solar cells. Devices with different blend mixing ratios and a variation of hole transport layer are prepared by vacuum deposition and compared to drift-diffusion simulation data. It is shown that the open circuit voltage is mainly defined by the mixing ratio, whereas the fill factor is strongly influenced by the choice of hole transport layer. Extraction barriers for photogenerated holes lead to S-shaped IV curves. The strength of the S-shape scales with the height of the extraction barrier. The slope of the IV curves at open circuit suggests that the observed increase in open circuit voltage with a higher amount of C₆₀ in the blend might be due to a downshift of the highest occupied molecular orbital of ZnPc.

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Wolfgang R. Tress, Steffen Pfützner, Karl Leo, and Moritz K. Riede "Open circuit voltage and IV curve shape of ZnPc:C₆₀ solar cells with varied mixing ratio and hole transport layer," Journal of Photonics for Energy 1(1), 011114 (1 January 2011). https://doi.org/10.1117/1.3556726

Published: 1 January 2011

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