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

Scientific Reports
Sara JäckleKlaus Lips

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/c-Si/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 ~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 disc...Continue Reading

References

May 2, 2012·Nano Letters·Sangmoo JeongYi Cui
May 16, 2015·Nanoscale Research Letters·Hao Wangᅟ Rusli
Aug 19, 2015·Scientific Reports·Sara JäckleSilke Christiansen
Mar 12, 2016·ACS Applied Materials & Interfaces·Sara JäckleSilke H Christiansen

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Citations

Mar 8, 2020·Polymers·Beata JewłoszewiczIreneusz Plebankiewicz
Oct 14, 2020·Advanced Materials·Yohan KoYongseok Jun
Nov 30, 2020··Bonex Wakufwa MwakikungaOluwasegun Chijoke Adekoya

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Methods Mentioned

BETA
atomic force microscopy

Software Mentioned

mathop
BackPEDOT
GenPro4 ’
MATLAB
GenPro4

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