Facile Deposition of Nb2O5 Thin Film as an Electron-Transporting Layer for Highly Efficient Perovskite Solar Cells

In a typical high-performance perovskite solar cell (PSC), the electron-transporting layer (ETL) plays a critical role in facilitating the transportation of the photogenerated carriers from perovskite to electrode. In the present work, the solution-processed Nb2O5 film is successfully prepared to se...

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Bibliographic Details
Published inACS applied nano materials Vol. 1; no. 8; pp. 4101 - 4109
Main Authors Shen, Deli, Zhang, Weifeng, Li, Yafeng, Abate, Antonio, Wei, Mingdeng
Format Journal Article
LanguageEnglish
Published American Chemical Society 24.08.2018
Subjects
electron-transporting layer
perovskite solar cell
facile deposition
Nb2O5
photovoltaic property
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Summary:In a typical high-performance perovskite solar cell (PSC), the electron-transporting layer (ETL) plays a critical role in facilitating the transportation of the photogenerated carriers from perovskite to electrode. In the present work, the solution-processed Nb2O5 film is successfully prepared to serve as an alternative for replacing the overwhelmingly dominated TiO2 ETL with a facile deposition approach. By adjusting the spin-coating process of the precursor solution, the best power conversion efficiency of 19.2% is achieved in the Nb2O5-based planar PSC when the thickness of C–Nb2O5 ETL is about 100 nm. The characterization including ultraviolet photoelectron spectroscopy, electronic impedance spectroscopy, and photoluminescence spectrum results elucidate that the impressive photovoltaic performances can be attributed to the proper Nb2O5 ETL conductive band, the lower charge recombination rate, the more efficient extraction, and transportation of the photogenerated carriers from the perovskite absorber.
ISSN:2574-0970
2574-0970
DOI:10.1021/acsanm.8b00859