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Issue 4, 2017
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Hematite electron-transporting layers for environmentally stable planar perovskite solar cells with enhanced energy conversion and lower hysteresis

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Abstract

Non-obvious hysteresis and higher steady-state power conversion efficiency (PCE) were demonstrated by simply employing hematite (α-Fe2O3) as the electron transporting layer (ETL) to replace the conventional titania (TiO2) ETL in planar heterojunction perovskite solar cells. The achieved higher built-in potential across the perovskite layer for the devices using α-Fe2O3 ETLs led to more efficient charge extraction/transport and less charge recombination than using TiO2 ETLs. As a consequence, a significant reduction in the charge accumulation at the perovskite/α-Fe2O3 interface made the device much less sensitive to the scanning rate and direction, i.e., lower hysteresis. Furthermore, α-Fe2O3 based devices displayed good stability over 30 days of storage time with exposure to ambient air, owing to the higher crystalline quality and uniform grain size of the perovskite films deposited on α-Fe2O3 ETLs than on TiO2 ETLs.

Graphical abstract: Hematite electron-transporting layers for environmentally stable planar perovskite solar cells with enhanced energy conversion and lower hysteresis

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Publication details

The article was received on 23 Oct 2016, accepted on 05 Dec 2016 and first published on 05 Dec 2016


Article type: Communication
DOI: 10.1039/C6TA09174A
Citation: J. Mater. Chem. A, 2017,5, 1434-1441
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    Hematite electron-transporting layers for environmentally stable planar perovskite solar cells with enhanced energy conversion and lower hysteresis

    W. Hu, T. Liu, X. Yin, H. Liu, X. Zhao, S. Luo, Y. Guo, Z. Yao, J. Wang, N. Wang, H. Lin and Z. Guo, J. Mater. Chem. A, 2017, 5, 1434
    DOI: 10.1039/C6TA09174A

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