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dc.contributor.authorChirvony, Vladimir
dc.contributor.authorSuárez, Isaac
dc.contributor.authorRodríguez Romero, Jesús
dc.contributor.authorVázquez-Cárdenas, Rubén
dc.contributor.authorSanchez-Diaz, Jesus
dc.contributor.authorMolina-Sánchez, Alejandro
dc.contributor.authorBarea, Eva M
dc.contributor.authorMora-Sero, Ivan
dc.contributor.authorMartínez-Pastor, Juan P.
dc.date.accessioned2021-08-23T07:09:40Z
dc.date.available2021-08-23T07:09:40Z
dc.date.issued2021-06-16
dc.identifier.citationACS Appl. Nano Mater. 2021, 4, 6, 6170–6177ca_CA
dc.identifier.urihttp://hdl.handle.net/10234/194518
dc.description.abstractAn outstanding potentiality of layered two-dimensional (2D) organic–inorganic hybrid perovskites (2DHPs) is in the development of solar cells, photodetectors, and light-emitting diodes. In 2DHPs, an exciton is localized in an atomically thin lead(II) halide inorganic layer of sub-nanometer thickness as in a quantum well sandwiched between organic layers as energetic and dielectric barriers. In previous years, versatile optical characterization of 2DHPs has been carried out mainly for thin flakes of single crystals and ultrathin (of the order of 20 nm) polycrystalline films, whereas there is a lack of optical characterization of thick (hundreds of nanometers) polycrystalline films, fundamentals for fabrication of devices. Here, with the use of photoluminescence (PL) and absorption spectroscopies, we studied the exciton behavior in ∼200 nm polycrystalline thin films of 2D perovskite (PEA)2PbI4, where PEA is phenethylammonium. Contrary to the case of ultrathin films, we have found that peak energies and line width of the excitonic bands in our films demonstrate unusual extremely weak sensitivity to temperature in 20–300 K diapason. The excitonic PL band is characterized by a significant (∼30 meV) Stokes shift with respect to the corresponding absorption band as well as by a full absence of the exciton fine structure at cryogenic temperatures. We suggest that the observed effects are due to the large inhomogeneous broadening of the excitonic PL and absorption bands resulting from the (PEA)2PbI4 band gap energy dependence on the number of lead(II) halide layers of individual crystallites. The characteristic time of the exciton energy funneling from higher- to lower-energy crystallites within (PEA)2PbI4 polycrystalline thin films is about 100 ps.ca_CA
dc.format.extent18 p.ca_CA
dc.format.mimetypeapplication/pdfca_CA
dc.language.isoengca_CA
dc.publisherAmerican Chemical Societyca_CA
dc.relation.isPartOfACS Appl. Nano Mater. 2021, 4, 6, 6170–6177ca_CA
dc.rightsAtribución 4.0 Internacionalca_CA
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/ca_CA
dc.subject2D halide perovskiteca_CA
dc.subjectpolycrystalline filmca_CA
dc.subjectexcitonic photoluminescenceca_CA
dc.subjectabsorptionca_CA
dc.subjectinhomogeneous broadeningca_CA
dc.titleInhomogeneous Broadening of Photoluminescence Spectra and Kinetics of Nanometer-Thick (Phenethylammonium)2PbI4 Perovskite Thin Films: Implications for Optoelectronicsca_CA
dc.typeinfo:eu-repo/semantics/articleca_CA
dc.identifier.doihttps://doi.org/10.1021/acsanm.1c00984
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_CA
dc.type.versioninfo:eu-repo/semantics/publishedVersionca_CA
project.funder.nameSpanish MINECOca_CA
project.funder.nameministry of Science and Innovation of Spainca_CA
project.funder.nameEuropean Research Council (ERC)ca_CA
project.funder.nameUniversity Jaume Ica_CA
project.funder.nameA.M.-S. acknowledges the Ramón y Cajal programmeca_CA
project.funder.nameCONACYTca_CA
oaire.awardNumberTEC2017-86102-C2-1-Rca_CA
oaire.awardNumberSTABLE PID2019-107314RB-I00ca_CA
oaire.awardNumber724424-No-LIMITca_CA
oaire.awardNumberDEPE2D UJI-B2019-09ca_CA
oaire.awardNumberRYC2018-024024-I; MINECO, Spainca_CA
oaire.awardNumber445257ca_CA


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Atribución 4.0 Internacional
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