Semitransparent Organic Solar Cells with Superior Thermal/Light Stability and Balanced Efficiency and Transmittance

Abstract

Semitransparent organic solar cells show attractive potential in the application of building-integrated photovoltaics, agrivoltaics, floating photovoltaics, and wearable electronics, as their multiple functionalities of electric power generation, photopermeability, and color tunability. Design and exploration of semitransparent organic solar cells with optimal and balanced efficiency and average visible light transmittance and simultaneously high stability are in great demand. In this work, based on a layer-by-layer-processed active layer and an ultrathin metal electrode, inverted semitransparent organic solar cells (ITO/AZO/PM6/BTP-eC9/MoO₃/Au/Ag) were fabricated. Optimal and balanced efficiency and average visible light transmittance were demonstrated, and simultaneously promising thermal and light stability were achieved for the obtained devices. The power conversion efficiency of 13.78–12.29% and corresponding average visible light transmittance of 14.58–25.80% were recorded for the ST-OSC devices with 25–15 nm thick Ag electrodes, respectively. Superior thermal and light stability with ∼90% and ∼85% of initial efficiency retained in 400 h under 85°C thermal stress and AM1.5 solar illumination were demonstrated, respectively.

Keywords

organic solar cell / semitransparent / thermal/light stability

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