ITO-free inverted organic solar cells fabricated with transparent and low resistance ZnO/Ag/ZnO multilayer electrode

Jun Ho Kim, Tae Woon Kang, Seok In Na, Young Zo Yoo, Tae Yeon Seong

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Inverted organic solar cells (OSCs) based on poly (3-hexylthiophene) (P3HT):[6,6]-phenyl-C61 butyric acid methyl ester (PCBM) bulk heterojunctions (BHJ) were fabricated with optimized ZnO/Ag/ZnO multilayer and conventional indium-tin oxide (ITO) cathode electrodes and their performance was compared. The ZnO/Ag/ZnO multilayer films showed sheet resistances in the range 3.6-3.9 Ω/sq, while ITO exhibited 14.2 Ω/sq. On the one hand, the carrier concentration gradually decreased from 1.74 × 1022 to 4.33 × 1021 cm-3 as the ZnO thickness increased from 8 to 80 nm, respectively. The transmittance of the ZnO(40 nm)/Ag(19 nm)/ZnO(40 nm) films was ∼95% at 550 nm, which is comparable to that of ITO (∼96%). The multilayer films were smooth with a root mean square (RMS) roughness of 0.81 nm. OSCs fabricated with the ZnO(40 nm)/Ag(19 nm)/ZnO(40 nm) film showed a power conversion efficiency (2.63%) comparable to that of OSCs with a conventional ITO cathode (2.71%).

Original languageEnglish
Pages (from-to)829-832
Number of pages4
JournalCurrent Applied Physics
Volume15
Issue number7
DOIs
Publication statusPublished - 2015 Mar 5

Keywords

  • Ag
  • Multilayer
  • Organic solar cell
  • Transparent conducting electrode
  • ZnO

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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