Inverted polymer solar cells with atomic layer deposited CdS film as an electron collection layer

  • Jun Jun Zhu
  • , Zai Quan Xu
  • , Guo Qiang Fan
  • , Shuit Tong Lee
  • , Yan Qing Li*
  • , Jian Xin Tang
  • *Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

An efficient inverted polymer solar cell (PSC) is reported by employing an atomic layer deposited (ALD) cadmium sulfide (CdS) film between the indium tin oxide (ITO) cathode and the photoactive layer as the electron collection layer (ECL), on which a active layer is composed of a blended poly(3-hexylthiophene) and [6,6]-phenyl C61 butyric acid methyl ester (P3HT:PCBM) bulk heterojunction. As determined by photoelectron spectroscopy, the sulfur vacancy induces an n-type semiconducting property in the ALD-grown CdS films, and suitable energy level alignment at the ITO/CdS/PCBM interface is favorable to electron extraction through CdS to the ITO electrode. With the optimized CdS film thickness, the power conversion efficiency increases to 3.33%, with short-circuit current of 8.94 mA/cm2, open-circuit voltage of 0.61 V, and fill factor of 61.1% under AM1.5G 100 mW/cm2 irradiation.

Original languageEnglish
Pages (from-to)2151-2158
Number of pages8
JournalOrganic Electronics
Volume12
Issue number12
DOIs
StatePublished - Dec 2011
Externally publishedYes

Keywords

  • Atomic layer deposition
  • CdS
  • Electron collection layer
  • Inverted structure
  • Polymer solar cell

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