Airbrush Coated PEDOT:PSS Back Contacts for Silicon Solar Cells

In this work, we demonstrate the use of an in-house built automated airbrush system to spray coat PEDOT:PSS layers on p-type silicon surfaces. We identify the effects of chemical additives on spraying reliability and show that the addition of a fluorosurfactant can provide a clog-free operation that...

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Bibliographic Details
Published in2020 2nd International Conference on Photovoltaic Science and Technologies (PVCon) pp. 1 - 4
Main Authors Turkay, Deniz, Ulkutasir, Batuhan, Artuk, Kerem, Cuce, Elif, Tsoi, Konstantin, Yerci, Selcuk
Format Conference Proceeding
LanguageEnglish
Published IEEE 30.11.2020
Subjects
Contacts
PEDOT:PSS
Performance evaluation
Photovoltaic cells
Silicon
solar cell
Surface morphology
Temperature
Voltage
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Summary:In this work, we demonstrate the use of an in-house built automated airbrush system to spray coat PEDOT:PSS layers on p-type silicon surfaces. We identify the effects of chemical additives on spraying reliability and show that the addition of a fluorosurfactant can provide a clog-free operation that is suitable for laboratory use. Next, we analyze the influence of hot plate temperature and nozzle height on the saturation current density (J 0s ) of PEDOT:PSS on mirror polished silicon. The silicon surface has either a wet chemically grown silicon oxide or the oxide stripped away by dipping into a hydrofluoric (HF) acid solution. For the samples with chemical oxides, J 0s values below 30 fA/cm 2 are achieved at an optimal hot plate temperature of ~180 °C. For HF-dipped samples, the J 0s values are larger than 75 fA/cm 2 and there is no clear dependency on plate temperature. Finally, we demonstrate the device performance using 2×2 cm 2 silicon solar cells with double side pyramid texturing, phosphorus diffused front emitters and spray-coated PEDOT:PSS back contacts deposited on single side HF processed surfaces. We achieve the best cell performances at 100 °C and demonstrate a power conversion efficiency of 16.2%.
DOI:10.1109/PVCon51547.2020.9757726