Lee, Wonmok Kim, Incheol Choi, Hana Kim, Kyungkon 2024-01-20T11:32:58Z 2024-01-20T11:32:58Z 2022-01-25 2013-09 0257-8972 https://pubs.kist.re.kr/handle/201004/127680 Nickel oxide (NiO) nanoparticle is a promising material as a p-type semiconductor to replace PEDOT:PSS which is frequently used as a hole transport layer in organic solar cells. In this study, we synthesized Ni/NiO core-shell nanoparticles via direct thermolysis of Ni(acac)(2) in the presence of trioctylphosphine oxide ligand and subsequent air oxidation to increase NiO shell thickness. Transmission electron microscopy analysis revealed the core-shell structure of Hi/Hi with average size of similar to 10 nm as well as an increased shell thickness by air-oxidation. The oxidized nanoparticles were well dispersed in organic solvent such as toluene, which can directly form a hole transport layer of organic solar cell by wet coating method. By spin coating various Ni/NiO nanoparticles on the ITO surface, organic solar cells with P3HT:PCBM bulk heterojunction as an active layer were fabricated. Solar cells utilizing air-oxidized Ni/NiO core-shell nanoparticle interlayer exhibited a better performance compared to those utilizing the as-synthesized Ni/NiO layer, or with no interlayer in between ITO and active layer. (C) 2012 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA Synthesis of Ni/NiO core-shell nanoparticles for wet-coated hole transport layer of the organic solar cell Article 10.1016/j.surfcoat.2012.01.024 1 SURFACE & COATINGS TECHNOLOGY, v.231, pp.93 - 97 SURFACE & COATINGS TECHNOLOGY 231 93 97 N scie scopus 000328094200021 2-s2.0-84882868129 Materials Science, Coatings & Films Physics, Applied Materials Science Physics Article STABILITY OXIDE DEVICE ANODE NIO Ni/NiO core-shell nanoparticle Air-oxidation p-type semiconductor Hole transport layer Electron blocking