Solution-processed Zn2SnO4 electron transporting layer for efficient planar perovskite solar cells

Wu-Qiang Wu, Dehong Chen, Feng Li, Yi Bing Cheng, Rachel A. Caruso

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

The development of ternary metal oxide based electron transporting layers (ETLs) opens an alternative composition for constructing perovskite solar cells (PSCs). Herein, a solution processed route to prepare a dense and uniform Zn2SnO4 (ZTO) thin film is reported for use as an excellent alternative ETL material for high-performance planar PSCs. The ZTO film exhibits good antireflective properties, with significantly improved optical transmittance over the entire range of wavelengths. The ZTO ETL improves the quality of the methylammonium lead iodide (MAPbI3) layer, giving enhanced crystallinity and a flatter surface. The hole-blocking ability, suitable energy band positioning for MAPbI3 and high electron mobility of the ZTO films facilitate the charge extraction and collection at the ZTO/MAPbI3 interface and suppress the charge recombination through the planar PSC device. The best-performing PSC based on the optimized ZTO ETL thin film exhibits a champion power conversion efficiency of 16.38% under AM 1.5G one sun illumination (100 mW cm−2), indicating that ZTO is a promising ETL alternative for the construction of highly efficient perovskite photovoltaic devices. These ETL thin films have good optical and electrical properties, such as antireflection for maximized light harvesting as well as high electron mobility and interfacial band-alignment for charge collection.

Original languageEnglish
Pages (from-to)260-266
Number of pages7
JournalMaterials Today Energy
Volume7
DOIs
Publication statusPublished - Mar 2018

Keywords

  • Charge extraction
  • Interfacial recombination
  • Perovskite
  • Solar cells
  • Ternary metal oxide

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