Abstract

Design and synthesis of low bandgap (LBG) nonfullerene small molecule acceptor (SMA) is of critical importance for realizing high-efficiency semitransparent organic solar cells (ST-OSCs). In this article, we synthesized a LBG new SMA, ID-4Cl, by introducing four chlorine substituents onto the electron-acceptor terminals of IDIC. Its optical bandgap (Egopt) is 1.51 eV, which helps to obtain large short-circuit current-density (Jsc) without scarifying the transmittance in the visible human-eye-sensitive wavelength region (360–700 nm). The optimal opaque device performance was obtained on a relatively thin active layer of 65 nm, showing high power conversion efficiency (PCE) of 10.2%, large Jsc of 18 mA/cm2, high fill factor (FF) of 75%, and open-circuit voltage of 0.77 V. The ST-OSC device fabricated with the structure of ITO/PEDOT:PSS/active layer/PDINO/Au (15 nm) shown a PCE of 6.99% in a small area of 4 mm2 and 1.1% in a large area of 1 cm2 with an AVT (average visible transmittance) of 43.7%, showing potentiality in building integrated photovoltaics.

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