Abstract
In this work, a polymer thin film, polystyrenesulfonate (PSS), is employed in interdigitated back contact (IBC) solar cells as an anti‐reflection (AR) coating and front surface passivation (SP) layer. It is found that PSS thin film is highly transparent and possesses a refraction index of about 1.5, and thus functions well as AR coating for Si wafer‐based solar cells. An effective minority carrier lifetime of 2.3 ms is obtained on 1–5 Ω · cm n‐type crystalline Si wafer with both sides symmetrically coated by PSS thin film, proving a good Si surface passivation by this polymer. An increase in power conversion efficiency is obtained when 150 nm‐thick PSS thin film is coated on the front surface of IBC solar cells without any AR/SP layers, resulted from the increased short circuit current density and open circuit voltage. This work opens up a new approach using organic polymer thin film deposited with low temperature and vacuum‐free technique as AR/SP multifunctional layer in Si solar cells.
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