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Journal Article

Potential of PEDOT: PSS as a hole selective front contact for silicon heterojunction solar cells

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Jaeckle,  Sara
Christiansen Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Helmoltz-Center Berlin for Materials & Energy (HZB);

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Christiansen,  Silke
Christiansen Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Helmoltz-Center Berlin for Materials & Energy (HZB);
Free University of Berlin, Fachbereich Phys ;

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Citation

Jaeckle, S., Liebhaber, M., Gersmann, C., Mews, M., Jaeger, K., Christiansen, S., et al. (2017). Potential of PEDOT: PSS as a hole selective front contact for silicon heterojunction solar cells. SCIENTIFIC REPORTS, 7: 2170. doi:10.1038/s41598-017-01946-3.


Cite as: http://hdl.handle.net/21.11116/0000-0000-879D-7
Abstract
We show that the highly conductive polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS) can successfully be applied as a hole selective front contact in silicon heterojunction (SHJ) solar cells. In combination with a superior electron selective heterojunction back contact based on amorphous silicon (a-Si), mono-crystalline n-type silicon (c-Si) solar cells reach power conversion efficiencies up to 14.8% and high open-circuit voltages exceeding 660 mV. Since in the PEDOT: PSS/cSi/ a-Si solar cell the inferior hybrid junction is determining the electrical device performance we are capable of assessing the recombination velocity (v(I)) at the PEDOT: PSS/c-Si interface. An estimated v(I) of similar to 400 cm/s demonstrates, that while PEDOT: PSS shows an excellent selectivity on n-type c-Si, the passivation quality provided by the formation of a native oxide at the c-Si surface restricts the performance of the hybrid junction. Furthermore, by comparing the measured external quantum efficiency with optical simulations, we quantify the losses due to parasitic absorption of PEDOT: PSS and reflection of the device layer stack. By pointing out ways to better passivate the hybrid interface and to increase the photocurrent we discuss the full potential of PEDOT: PSS as a front contact in SHJ solar cells.