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

Sara Jäckle, Martin Liebhaber, Clemens Gersmann, Mathias Mews, Klaus Jäger, Silke H Christiansen, Klaus Lips

Research output: Contribution to journalArticleResearchpeer-review

46 Citations (Scopus)

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 discuss the full potential of PEDOT:PSS as a front contact in SHJ solar cells.

Original languageEnglish
Article number2170
Number of pages8
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 19 May 2017
Externally publishedYes

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