Surface engineering of ZnO electron transporting layer via Al doping for high efficiency planar perovskite solar cells

Zong Liang Tseng, Chien Hung Chiang, Sheng Hsiung Chang, Chun Guey Wu

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

Abstract

ZnO was known as a good electron transporting material for the planar perovskite solar cells (PSCs). The stability of perovskite cell based on ZnO electron transporting layer (ETL) however is not good, due to the basicity nature of ZnO, which will react with the proton on CH3NH3+ of perovskite. Doping was used successfully to modify the physicochemical properties of ZnO to improve the performance. High quality, fully covered Al doped ZnO (AZO) thin (~20 nm) film on ITO substrate was successfully prepared by a sputtering method. Compared to the cell based on ZnO, perovskite cell using AZO as ETL has better stability, comparable Jsc, higher Voc and FF. The best AZO based perovskite cell achieves the highest power conversion efficiency of 17.6% with Voc of 1.07 V which the highest Voc for the perovskite solar cell based on ZnO ETL. The improvement in the photovoltaic performance was due to AZO has higher conductivity, more resistance to the acid and better band matching with MAPbI3 compared to ZnO. The highly conducting and transparent AZO film was also used to replace ITO/ZnO as an anode as well as the ETL in the planer perovskite cell to achieve the PCE of 6.3%.

Original languageEnglish
Pages (from-to)311-318
Number of pages8
JournalNano Energy
Volume28
DOIs
StatePublished - 1 Oct 2016

Keywords

  • AZO
  • CHNHPbI
  • Solar cell
  • Surface modification
  • ZnO

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