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Crystallinity-Engineered Schiff-Base Nickel Cathode Interlayers for Thermally Stable and High-Efficiency Organic
Wenliang Li1, Tingting Wang1, Xinkang Wang2
1College of Chemistry and Chemical Engineering/Film Energy Chemistry For Jiangxi Provincial Key Laboratory (FEC)/Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, Nanchang, P. R. China.
Abstract:
Stable and efficient cathode interlayers (CILs) materials pivotal to achieving efficient and stable organic solar cells (OSCs). Here, we report a library of ten Schiff-base nickel complexes engineered as CILs and investigate their device performance and stability. Given their exceptional charge-transport and interfacial properties, three structurally distinct representatives (Ni-Nap, Ni-Ph, and Ni-CH3) were strategically selected for mechanistic investigation. When incorporated into PM6:L8-BO OSCs, devices with Ni-CH3 achieved a power conversion efficiency (PCE) of 19.31%, surpassing Ni-Ph (18.40%) and Ni-Nap (15.11%). Notably, an even higher PCE of 20.01% was achieved in D18:L8-BO OSCs. Ni-CH3 possessed the lowest crystallinity, and its morphologically stable, crack-free nature was conclusively demonstrated by comprehensive structural characterization techniques. Therefore, Ni-CH3-employed device exhibited outstanding storage stability, with a T80 lifetime exceeding 816 h, significantly surpassing those employing of Ni-Nap and Ni-Ph (<24 h). This work overcomes the stability challenge of Schiff-base nickel complexes when employed as CILs in OSCs, establishing them as outstanding candidate CILs for high performance OSCs.
