Evolving Stark Effect During Growth of Perovskite Nanocrystals Measured Using Transient Absorption

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dc.contributor.authorSadighian, James C.
dc.contributor.authorWilson, Kelly S.
dc.contributor.authorCrawford, Michael L.
dc.contributor.authorWong, Cathy Y.
dc.date.accessioned2022-10-12T00:58:01Z
dc.date.available2022-10-12T00:58:01Z
dc.date.issued2020-10
dc.description8 pagesen_US
dc.description.abstractMethylammonium lead triiodide (MAPbI3) nanocrystals (NCs) are emerging materials for a range of optoelectronic applications. Photophysical characterization is typically limited to structurally stable NCs owing to the long timescales required for many spectroscopies, preventing the accurate measurement of NCs during growth. This is a particular challenge for non-linear spectroscopies such as transient absorption. Here we report on the use of a novel single-shot transient absorption (SSTA) spectrometer to study MAPbI3 NCs as they grow. Comparing the transient spectra to derivatives of the linear absorbance reveals that photogenerated charge carriers become localized at surface trap states during NC growth, inducing a TA lineshape characteristic of the Stark effect. Observation of this Stark signal shows that the contribution of trapped carriers to the TA signal declines as growth continues, supporting a growth mechanism with increased surface ligation toward the end of NC growth. This work opens the door to the application of time-resolved spectroscopies to NCs in situ, during their synthesis, to provide greater insight into their growth mechanisms and the evolution of their photophysical properties.en_US
dc.description.sponsorshipThis material is based upon work supported by the National Science Foundation under grant CHE- 1752129. MC acknowledges financial support from ARCS Oregon Chapter.en_US
dc.identifier.citationSadighian JC, Wilson KS, Crawford ML and Wong CY (2020) Evolving Stark Effect During Growth of Perovskite Nanocrystals Measured Using Transient Absorption. Front. Chem. 8:585853. doi: 10.3389/fchem.2020.585853en_US
dc.identifier.urihttps://www.frontiersin.org/articles/10.3389/fchem.2020.585853/full
dc.identifier.urihttps://hdl.handle.net/1794/27680
dc.language.isoenen_US
dc.publisherFrontiersen_US
dc.rightsCreative Commons BY-NC-ND 4.0-USen_US
dc.subjectperovskiteen_US
dc.subjectnanocrystalsen_US
dc.subjectsurfaceen_US
dc.subjectultrafasten_US
dc.subjectspectroscopyen_US
dc.subjectStark effecten_US
dc.subjecttransient absorptionen_US
dc.titleEvolving Stark Effect During Growth of Perovskite Nanocrystals Measured Using Transient Absorptionen_US
dc.typeArticleen_US

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