Double Anthracene‐Based Sensitizers for High‐Efficiency Dye‐Sensitized Solar Cells under Both Sunlight and Indoor Light

The development of photosensitizers with extended π ‐conjugation and spectral matching to sunlight and fluorescent light is crucial for achieving high power conversion efficiency (PCE) in dye‐sensitized solar cells (DSSCs). This study presents a series of novel anthracene‐based photosensitizers, AMO1–AMO4 . This series has been designed with bulky modified Hagfeldt donors to suppress undesired molecular aggregation, double anthracene groups for enhanced π‐conjugation, acetylene groups for improved molecular planarity, and four distinct acceptors to fine‐tune their photophysical and electrochemical properties. The performance of the novel dyes in DSSCs is investigated using two copper redox shuttles, Cu I/II (dmp) 2 and Cu I/II (dmodmbp) 2 . Among the investigated dyes, AMO2 mediated with Cu I/II (dmodmbp) 2 exhibits the highest power conversion efficiency (PCE) of 10.05% ( J SC = 13.72 mA cm 2 , V OC = 1.035 V, and FF = 0.71) under sunlight illumination and an outstanding PCE of 34.64% under T5 illumination (6000 lux). These achievements underscore the remarkable potential of anthracene‐bridged sensitized DSSCs in indoor and outdoor applications.