Solvent-Mediated Dimension Tuning of Semiconducting Oxide Nanostructures as Efficient Charge Extraction Thin Films for Perovskite Solar Cells with Efficiency Exceeding 16%

Wu Qiang Wu, Fuzhi Huang, Dehong Chen, Yi-Bing Cheng, Rachel Anne Caruso

Research output: Contribution to journalArticleResearchpeer-review

45 Citations (Scopus)

Abstract

The recent surge in efficiency and progress of organohalide perovskite solar cells (PSCs) has been significant. The PSC performance is significantly influenced by nanostructuring as this varies the intrinsic optical, electrical, and electrochemical properties. Diverse TiO2 electron transport layers (ETLs) are solvothermally grown on the transparent conducting oxide substrate with different dimensionalities, 0D nanoparticles (TNP), 1D nanowires (TNW) to 2D nanosheets (TNS), by varying the organic solvent used. These layers feature enhanced optical transparency (≈2%-5% transmittance improvement compared to pristine fluorine doped tin oxide, FTO, glass) minimizing light absorption losses. PSCs constructed using 1D TNW or 2D TNS yield enhanced photovoltaic performance compared to the 0D TNP counterparts. This is a result of i) improved infiltration of the perovskite in the porous TNW or TNS network and ii) facilitated electron transport and charge extraction at the TNW/perovskite or TNS/perovskite interfaces, thus reduced interfacial recombination loss. Employing a bilayered ETL film consisting of a self-assembled TiO2 blocking layer and a subsequent TNW active layer, produces PSC devices with an efficiency exceeding 16%. This bilayered ETL film can simultaneously block the photogenerated holes and enhance electron extraction, therefore improving PSC performance.

Original languageEnglish
Article number1502027
Number of pages11
JournalAdvanced Energy Materials
Volume6
Issue number7
DOIs
Publication statusPublished - 6 Apr 2016

Keywords

  • nanoparticles
  • nanosheets
  • nanowires
  • perovskite
  • solar cells
  • TiO

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