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Issue 14, 2018
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Tailored dimensionality to regulate the phase stability of inorganic cesium lead iodide perovskites

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Abstract

Inorganic CsPbI3 perovskites have shown promising potential for achieving all-inorganic photovoltaic (PV) devices. However, the black perovskite polymorph (α-phase) of CsPbI3 easily converts into yellow colour (δ-phase) in an ambient environment and it is only stable at high temperature (above 320 °C), which limits its practical application. Here we tailor the three-dimensional CsPbI3 perovskite into quasi-two-dimension through adding a large radius cation phenylethylammonium (PEA+). The incorporation of PEA+ into the CsPbI3 perovskite significantly improves the film morphology as well as the phase stability. An optimal CsxPEA1−xPbI3 perovskite film remains stable in the α-phase from room temperature to 250 °C in air and yields a power conversion efficiency of 5.7% for its solar device. The concept of using large radius cations in the 3D perovskite system provides a new perspective to further enhance the phase stability while retaining the device performance.

Graphical abstract: Tailored dimensionality to regulate the phase stability of inorganic cesium lead iodide perovskites

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Publication details

The article was received on 26 Jan 2018, accepted on 10 Mar 2018 and first published on 12 Mar 2018


Article type: Communication
DOI: 10.1039/C8NR00758F
Citation: Nanoscale, 2018,10, 6318-6322
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    Tailored dimensionality to regulate the phase stability of inorganic cesium lead iodide perovskites

    F. Li, Y. Pei, F. Xiao, T. Zeng, Z. Yang, J. Xu, J. Sun, B. Peng and M. Liu, Nanoscale, 2018, 10, 6318
    DOI: 10.1039/C8NR00758F

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