Dye Engineered Perovskite Solar Cells under Accelerated Thermal Stress and Prolonged Light Exposure

Abstract Herein, the thermal and light stability enhancement of planar perovskite solar cells (PSCs) based on the approach of dye‐sensitization of the titania compact layer with the triphenylamine‐based metal‐free organic (E)‐3‐(5‐(4‐(bis(2′,4′‐dibutoxy‐[1,1′‐biphenyl]‐4‐yl) amino) phenyl) thiophen‐2‐yl)‐2‐cyanoacrylic acid (D35) dye is reported. The D35 molecule is chemically adsorbed via a bidentate anchor group upon the TiO 2 underlayer. This enhances the power conversion efficiency of PSCs due to its well‐established versatile role, offering facilitation of electron charge transfer to the anode while favoring the growth of robust and homogenous perovskite layers. However, its influence in the PSC performance seems to expand further. The stability experiments showed an enhanced endurance for the devices after the insertion of D35, not only in shelf‐shield conditions but also after accelerated thermal tests and prolonged light exposure. This study confirms the plethoric role of dye sensitization strategy and its advantages to interfacial engineering via organic chromophores towards efficient and stable PSCs.