Enhanced efficiency and stability of polymer solar cells using solution-processed nickel oxide as hole transport material

Research output: Contribution to journalArticlepeer-review


  • Shanmugam Parthiban
  • Seungmin Kim
  • Vellaiappillai Tamilavan
  • Jihoon Lee
  • Insoo Shin
  • Yun Kyung Jung
  • Myung Ho Hyun
  • Jung Hyun Jeong
  • Sung Heum Park

Colleges, School and Institutes

External organisations

  • Department of Physics, Pukyong National University
  • School of Biomedical Engineering, Inje University
  • Department of Chemistry, Chemistry Institute for Functional Materials, Pusan National University


Solution-processed nickel oxide (s-NiOx) was synthesized for use as hole-transport layers (HTLs) in the fabrication of polymer solar cell (PSC) devices. The s-NiOx thin-films were deposited using spin-coating and post-annealed at 300 °C, 400 °C, or 500 °C. With increased annealing temperature, the nickel acetate precursor decomposes more fully and forms s-NiOx films that show larger crystalline grain sizes with lower root mean square surface roughness. Bulk heterojunction solar cells fabricated with the new random polymer RP(BDT-PDBT) and [6,6]-phenyl-C70-butyric acid methyl ester (PC70BM) using s-NiOx as HTLs exhibit a 4.46% enhancement in power conversion efficiency and better stability compared to conventional PSCs using poly (3,4-ethylenedioxythiophene):poly(styrene sulfonate) as HTLs. We believe that the solution-processable and highly stable s-NiOx could be a potential alternative for functional interface materials in optoelectronic devices.


Original languageEnglish
Pages (from-to)1232-1237
JournalCurrent Applied Physics
Issue number10
Early online date12 Jun 2017
Publication statusPublished - 1 Oct 2017


  • Polymer solar cell , Hole transport layer , Nickel oxide