Transparent Organic Photovoltaics with Average Visible Transmission of 90%

Abstract

Reducing active layer thickness is an effective method to improve the average visible transmission (AVT) and color rendering index (CRI) of transparent organic photovoltaics (TOPVs). However, the high-transparency TOPVs with ultrathin active layers often suffer from substantial charge recombination, resulting in low power conversion efficiency (PCE). Here, we report a ternary strategy of introducing a UV-absorbing molecule (TPA-TPD) into near-infrared absorbing TOPVs, which can significantly suppress the charge recombination when reducing the thickness of the active layer in TOPVs. Due to its good miscibility and charge transfer properties with the receptors, the aggregation of the receptors was suppressed, and the active layer was preferentially oriented in face-on orientation. The prepared TOPV exhibits an efficiency of 1.03% with a record AVT of 89% and a CRI of 98.1. This work provides a valuable reference for the fabrication of optoelectronic devices with ultrathin active layers.