Functional Interface Passivation of Hybrid PEDOT:PSS Silicon Solar Cells via Silicon Hydrosilylation

Chi Te Lin, You Lan Li, Yu Chun Chang, Bo Hua Lin, Hsin Fei Meng, Peichen Yu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Hybrid PEDOT:PSS-silicon heterojunction solar cells have the advantages of low temperature, low cost and solution process. However, as a low-quality native oxide layer can easily form on the surface of silicon substrates, the hybrid solar cells still suffer from charged carrier recombination at the defective interface, hence affecting the device characteristics. In this work, we employ a thermally induced silicon hydrosilylation technique to form a self-assembled monolayer(SAM) on the hydrogen-terminated silicon substrate, in order to prevent the oxidation and passivate the surface of silicon. The quality of this monolayer passivation is characterized by the contact angle, X-ray photoelectron spectroscopy (XPS) analyses. We have found that the SAM passivation can effectively reduce the contact resistance between silicon and the aluminum electrode, leading to an improved open-circuit voltage and fill-factor. However, as the silicon surface with the SAM passivation becomes hydrophobic, it is difficult to apply aqueous PEDOT:PSS solution onto silicon. Therefore, we further apply a low-damage oxygen plasma treatment to modify the terminal functional group of the monolayer to form a hydrophilic surface. The power conversion efficiency of the modified devices is between 10-12%. Although the PCE does not surpass the reference device due to possible chemical reactions between the PEDOT:PSS and SAM, the proposed low- damage oxygen-plasma treatment provide a viable solution for modifying the functional passivation of hybrid PEDOT:PSS silicon solar cells using SAMs.

Original languageEnglish
Title of host publication2020 47th IEEE Photovoltaic Specialists Conference, PVSC 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9781728161150
StatePublished - 14 Jun 2020
Event47th IEEE Photovoltaic Specialists Conference, PVSC 2020 - Calgary, Canada
Duration: 15 Jun 202021 Aug 2020

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371


Conference47th IEEE Photovoltaic Specialists Conference, PVSC 2020


  • photovoltaic cells
  • self-assemble monolayer
  • thermally induce hydrosilation


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