Abstract
Abstract Tetra-nuclear Zinc(II) complex Zn 4 O(AID) 6 [AID = 7-azaindolate] is a wide band gap luminescent material that exhibits efficient emission matching the absorption spectra of organic donor materials such as polythiophene (P3HT). This work demonstrates polymer solar cells (PSC) based on P3HT:PCBM (phenyl-C 61 -butyric acid methyl ester) blend active layer with a Zn 4 O(AID) 6 cathode interfacial layer achieving a power conversion efficiency (PCE) significantly higher than that of the reference devices. The energy level and impedance spectroscopy analysis show that the Zn 4 O(AID) 6 cathode interfacial layer acts as an efficient exciton/hole blocking layer, and reduces charge recombination rate with more efficient electron extraction. The Zn 4 O(AID) 6 interfacial layer also helps achieve longer lifetime of PSC devices. The improved efficiency and stability combined with low cost and nontoxicity of Zn 4 O(AID) 6 make it a promising cathode interfacial material for high-performance and stable PSC devices.
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