%0 Journal Article %1 zhang2017photoluminescence %A Zhang, Baohua %A Guo, Fuqiang %A Xue, Junjun %A Yang, Lianhong %A Zhao, Yafei %A Ge, Mei %A Cai, Qing %A Liu, Bin %A Xie, Zili %A Chen, Dunjun %A Lu, Hai %A Zhang, Rong %A Zheng, Youdou %D 2017 %J Scientific Reports %K perovskite %N 1 %P 17695-- %R 10.1038/s41598-017-18110-6 %T Photoluminescence Study of the Photoinduced Phase Separation in Mixed-Halide Hybrid Perovskite CH3NH3Pb(BrxI1−x)3 Crystals Synthesized via a Solvothermal Method %U https://doi.org/10.1038/s41598-017-18110-6 %V 7 %X We systematically synthesized mixed-halide hybrid perovskite CH3NH3Pb(BrxI1−x)3 (0 ≤ x ≤ 1) crystals in the full composition range by a solvothermal method. The as-synthesized crystals retained cuboid shapes, and the crystalline structure transitioned from the tetragonal phase to the cubic phase with an increasing Br-ion content. The photoluminescence (PL) of CH3NH3Pb(BrxI1−x)3 crystals exhibited a continuous variation from red (768 nm) to green (549 nm) with increasing the volume ratio of HBr (VHBr%), corresponding to a variation in the bandgap from 1.61 eV to 2.26 eV. Moreover, the bandgap of the crystals changed nonlinearly as a quadratic function of x with a bowing parameter of 0.53 eV. Notably, the CH3NH3Pb(BrxI1−x)3 (0.4 ≤ x ≤ 0.6) crystals exhibited obvious phase separation by prolonged illumination. The cause for the phase separation was attributed to the formation of small clusters enriched in lower-band-gap, iodide-rich and higher-band-gap, bromide-rich domains, which induced localized strain to promote halide phase separation. We also clarified the relationship between the PL features and the band structures of the crystals.

@article{zhang2017photoluminescence, abstract = {We systematically synthesized mixed-halide hybrid perovskite CH3NH3Pb(BrxI1−x)3 (0 ≤ x ≤ 1) crystals in the full composition range by a solvothermal method. The as-synthesized crystals retained cuboid shapes, and the crystalline structure transitioned from the tetragonal phase to the cubic phase with an increasing Br-ion content. The photoluminescence (PL) of CH3NH3Pb(BrxI1−x)3 crystals exhibited a continuous variation from red (768 nm) to green (549 nm) with increasing the volume ratio of HBr (VHBr%), corresponding to a variation in the bandgap from 1.61 eV to 2.26 eV. Moreover, the bandgap of the crystals changed nonlinearly as a quadratic function of x with a bowing parameter of 0.53 eV. Notably, the CH3NH3Pb(BrxI1−x)3 (0.4 ≤ x ≤ 0.6) crystals exhibited obvious phase separation by prolonged illumination. The cause for the phase separation was attributed to the formation of small clusters enriched in lower-band-gap, iodide-rich and higher-band-gap, bromide-rich domains, which induced localized strain to promote halide phase separation. We also clarified the relationship between the PL features and the band structures of the crystals.}, added-at = {2018-02-05T11:39:16.000+0100}, author = {Zhang, Baohua and Guo, Fuqiang and Xue, Junjun and Yang, Lianhong and Zhao, Yafei and Ge, Mei and Cai, Qing and Liu, Bin and Xie, Zili and Chen, Dunjun and Lu, Hai and Zhang, Rong and Zheng, Youdou}, biburl = {https://www.bibsonomy.org/bibtex/296e39385db04cf60eefe61334f5a84d4/martinstreiter}, doi = {10.1038/s41598-017-18110-6}, interhash = {f022aed71e9498635a5c64cd0bad5c6f}, intrahash = {96e39385db04cf60eefe61334f5a84d4}, issn = {20452322}, journal = {Scientific Reports}, keywords = {perovskite}, number = 1, pages = {17695--}, refid = {Zhang2017}, timestamp = {2018-02-05T11:39:16.000+0100}, title = {Photoluminescence Study of the Photoinduced Phase Separation in Mixed-Halide Hybrid Perovskite CH3NH3Pb(BrxI1−x)3 Crystals Synthesized via a Solvothermal Method}, url = {https://doi.org/10.1038/s41598-017-18110-6}, volume = 7, year = 2017 }