NiO<sub>x</sub> Nanoparticles Hole-Transporting Layer Regulated by Ionic Radius-Controlled Doping and Reductive Agent for Organic Solar Cells with Efficiency of 19.18.
basic_science · Level V
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- Record sourced from PubMed, PMID 38029790.
- Also identified by DOI 10.1002/adma.202310630.
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Abstract
Nickel oxide (NiO<sub>x</sub> ) has garnered considerable attention as a prospective hole-transporting layer (HTL) in organic solar cells (OSCs), offering a potential solution to the stability challenges posed by traditional HTL, PEDOT:PSS, arising from acidity and hygroscopicity. Nevertheless, the lower work function (WF) of NiO<sub>x</sub> relative to donor polymers reduces charge injection efficiency in OSCs. Herein, NiO<sub>x</sub> nanoparticles are tailored through rare earth doping to optimize WF and the impact of ionic radius on their electronic properties is explored. Lanthanum (La<sup>3+</sup> ) and yttrium (Y<sup>3+</sup> ) ions, with larger ionic radii, are effectively doped at 1 and 3%, respectively, while scandium (Sc<sup>3+</sup> ), with a smaller ion radius, allows enhanced 5% doping. Higher doping ratios significantly enhance WF of NiO<sub>x</sub> . A 5% Sc<sup>3+</sup> doping raises WF to 4.99 eV from 4.77 eV for neat NiO<sub>x</sub> while maintaining high conductivity. Consequently, using 5% Sc-doped NiO<sub>x</sub> as HTL improves the power conversion efficiency (PCE) of OSCs to 17.13%, surpassing the 15.64% with the neat NiO<sub>x</sub> . Further enhancement to 18.42% is achieved by introducing the reductant catechol, outperforming the PEDOT:PSS-based devices. Additionally, when employed in a ternary blend system (D18:N3:F-BTA3), an impressive PCE of 19.18 % is realized, top-performing among reported OSCs utilizing solution-processed inorganic nanoparticles.