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Postsynthesis Mn-Doping in CsPbI3 Nanocrystals to Stabilize the Black Perovskite Phase

Abstract

Long term stability of black perovskite phase of CsPbI3 in ambient conditions is an important challenge for their optoelectronic applications in real life. Nanocrystalline size is found to improve the stability of the black phase at room temperature. Furthermore, doping Mn is proposed to improve the stability of black perovskite phase of CsPbI3 nanocrystals (NCs). However, the undoped and Mn-doped CsPbI3 NCs are prepared in different batches with somewhat different synthesis conditions thus obliterating the role of Mn on stability of black phase of CsPbI3 NCs. Here, we elucidate the effect of Mn doping on the surface and lattice energy of CsPbI3 NCs, stabilizing the black phase. For this purpose, we employ a postsynthesis doping strategy which has an advantage that the initial host remains same for both undoped and Mn-doped sample. Uncertainties of size/shape, surface energy, and structure through direct synthesis of undoped and Mn-doped NCs in different batches can be neglected in our postsynthesis doping strategy, allowing us to study effect of dopant in a more controlled manner. Our postsynthesis Mn-doping in CsPbI3 NCs shows that the black phase stability in ambient conditions improves from few days for undoped to nearly a month’s time for Mn-doped sample. We find that though surface passivation with dopant precursor improve both colloidal and phase stability of black CsPbI3 NCs, it is the contraction of lattice upon Mn-doping that mainly stabilize the films of black phase CsPbI3 NCs. Similarly, we find that Mn-doped CsPbBr3 NCs show improved ambient stability of photoluminescence compared to the undoped sample.

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Publication details

The article was received on 09 Jan 2019, accepted on 08 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C9NR00248K
Citation: Nanoscale, 2019, Accepted Manuscript

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    Postsynthesis Mn-Doping in CsPbI3 Nanocrystals to Stabilize the Black Perovskite Phase

    W. J. Mir, A. Swarnkar and A. Nag, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR00248K

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