Low-temperature solution-processed SnO2 nanoparticles as a cathode buffer layer for inverted organic solar cells

Van Huong Tran, Rohan B. Ambade, Swapnil B. Ambade, Soo Hyoung Lee, In Hwan Lee

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)


SnO2 recently has attracted particular attention as a powerful buffer layer for organic optoelectronic devices due to its outstanding properties such as high electron mobility, suitable band alignment, and high optical transparency. Here, we report on facile low-temperature solution-processed SnO2 nanoparticles (NPs) in applications for a cathode buffer layer (CBL) of inverted organic solar cells (iOSCs). The conduction band energy of SnO2 NPs estimated by ultraviolet photoelectron spectroscopy was 4.01 eV, a salient feature that is necessary for an appropriate CBL. Using SnO2 NPs as CBL derived from a 0.1 M precursor concentration, P3HT:PC60BM-based iOSCs showed the best power conversion efficiency (PCE) of 2.9%. The iOSC devices using SnO2 NPs as CBL revealed excellent long-term device stabilities, and the PCE was retained at ∼95% of its initial value after 10 weeks in ambient air. These solution-processed SnO2 NPs are considered to be suitable for the low-cost, high throughput roll-to-roll process on a flexible substrate for optoelectronic devices.

Original languageEnglish
Pages (from-to)1645-1653
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number2
Publication statusPublished - 2017 Jan 18
Externally publishedYes


  • Cathode buffer layer
  • Inverted organic solar cells
  • Low-temperature synthesis
  • Nanoparticle morphology
  • SnO2 nanoparticles
  • Solution-processed metal oxide

ASJC Scopus subject areas

  • Materials Science(all)


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