Inverted bulk-heterojunction polymer solar cells using a sputter-deposited Al-doped ZnO electron transport layer

Sang Jin Lee, Soyeon Kim, Dong Chan Lim, Dong Hun Kim, Sahn Nahm, Seung Ho Han

Research output: Contribution to journalArticle

5 Citations (Scopus)


In this study, we realized an inverted polymer solar cell by depositing Al-doped ZnO (AZO) through room temperature radio-frequency magnetron sputtering as an electron transport layer (ETL) between an organic PTB7 and PC71BM mixture active layer and indium tin oxide (ITO) transparent electrode. The crystal structure of the AZO thin films changed as the Ar gas pressure was varied. X-ray diffraction showed that the highest crystallinity was obtained at 70 mTorr. Further experiments were carried out to determine the optimum thickness. An AZO film deposited on a glass substrate with a thickness of 100 nm had an average visible-light transmittance of 83.3% and an electrical resistivity of 6.6 × 10−3 Ω·cm. The power conversion efficiency (PCE) showed no significant difference with regard to thickness, and ranged from of 7% to 8%. The 100-nm AZO thin film had the highest PCE of 7.87%, which is approximately 90% higher than that of the sample without an ETL.

Original languageEnglish
Pages (from-to)717-722
Number of pages6
JournalJournal of Alloys and Compounds
Publication statusPublished - 2019 Mar 10



  • Al-doped ZnO thin film
  • Electron transport layer
  • Polymer solar cells
  • Power conversion efficiency
  • RF magnetron sputtering

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this