Room-Temperature-Processed Fullerene/TiO2 Nanocomposite Electron Transporting Layer for High-Efficiency Rigid and Flexible Planar Perovskite Solar Cells

Ping Cheng Wang, Venkatesan Govindan, Chien Hung Chiang, Chun Guey Wu

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Room-temperature-processed TiO2 (R-Lt-TiO2) electron transporting layers (ETLs) possess low conductivity and connectivity, resulting in poor photovoltaic performance. Herein, an ethanol (EtOH)-soluble, highly conducting fullerene derivative, C60RT6, was used as an additive for Lt-TiO2 ETLs. Room-temperature processed nanocomposite ETL (R-Fu/Lt-TiO2) is prepared simply by spin coating a C60RT6 and G-TiO2 NPs (TiO2 nanoparticle prepared by grinding the bulk TiO2 powder) mixture. R-Fu/Lt-TiO2 has better aligned with the frontier orbitals of the FAxMA1−xPbI3, better continuity, conductivity, flatness, and higher surface hydrophilicity compared to Lt-TiO2 ETL. Perovskite films spin coated on R-Fu/Lt-TiO2 ETLs also have slightly larger grains and thickness compared to those deposited on Lt-TiO2. Perovskite solar cells (PSCs) based on a R-Fu/Lt-TiO2 ETL possess higher power conversion efficiency (PCE, up to 20% on glass substrate), less (negligible) current hysteresis, and better long-term stability compared to those using R-Lt-TiO2 as an ETL. The flexible PSC (used indium tin oxide/polyethylene terephthalate (ITO/PET) as a substrate) with a R-Fu/Lt-TiO2 ETL achieves a PCE of 18.06% and retains 90% of the initial PCE after 500 bending cycles with a bending radius of 6 mm. The PCE of the flexible cell with a Lt-TiO2 ETL is only 8.2%, and loses 60% of the initial value after 500 bending cycles.

Original languageEnglish
Article number2000247
JournalSolar RRL
Volume4
Issue number10
DOIs
StatePublished - 1 Oct 2020

Keywords

  • flexible devices
  • low-temperature processing
  • nanocomposite electron transporting layers
  • perovskite solar cells

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