Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Phase Evolution During Perovskite Formation—Insight from Pair Distribution Function Analysis
AU - Sanchez, Sandy
AU - Steiner, Ullrich
AU - Hua, Xiao
PY - 2019/5/14
Y1 - 2019/5/14
N2 - The recent introduction of organometal halide perovskites to solar cells has significantly enhanced the power conversion efficiency of alternative photovoltaic devices, revolutionizing the development of photovoltaic technologies. To produce perovskite thin films with high device performances, various fabrication methodologies have been developed leading to thin films with different surface structures and crystal morphologies. Tremendous efforts have been devoted to characterizing macro- and microscopic structures within these films to better understand the processing–property–performance relationship. However, their atomic structure and its influence on device performance remains poorly understood. To this end, we employed pair distribution function analysis of X-ray total scattering data to obtain crystallographic and compositional information about methylammonium lead iodide (MAPbI3) thin films. This analysis revealed a presence of two near-amorphous intermediate phases with local structures that share subtle but significant correlations with the PbI2 precursor and the desired perovskite phase. The structure transformation from these intermediates to the perovskite deviates from the intuitive belief where the molecular cations get inserted between the sheets of layered PbI2 upon the crystallization of perovskites. This knowledge offers critical insight into the perovskite formation pathway and reveals an important link between the short-range structure of the thin films and their corresponding device performance.
AB - The recent introduction of organometal halide perovskites to solar cells has significantly enhanced the power conversion efficiency of alternative photovoltaic devices, revolutionizing the development of photovoltaic technologies. To produce perovskite thin films with high device performances, various fabrication methodologies have been developed leading to thin films with different surface structures and crystal morphologies. Tremendous efforts have been devoted to characterizing macro- and microscopic structures within these films to better understand the processing–property–performance relationship. However, their atomic structure and its influence on device performance remains poorly understood. To this end, we employed pair distribution function analysis of X-ray total scattering data to obtain crystallographic and compositional information about methylammonium lead iodide (MAPbI3) thin films. This analysis revealed a presence of two near-amorphous intermediate phases with local structures that share subtle but significant correlations with the PbI2 precursor and the desired perovskite phase. The structure transformation from these intermediates to the perovskite deviates from the intuitive belief where the molecular cations get inserted between the sheets of layered PbI2 upon the crystallization of perovskites. This knowledge offers critical insight into the perovskite formation pathway and reveals an important link between the short-range structure of the thin films and their corresponding device performance.
KW - Photovoltaics
KW - Perovskite
KW - pair distribution function
U2 - 10.1021/acs.chemmater.9b00748
DO - 10.1021/acs.chemmater.9b00748
M3 - Journal article
VL - 31
SP - 3498
EP - 3506
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 9
ER -