Short Photoluminescence Lifetimes Linked to Crystallite Dimensions, Connectivity, and Perovskite Crystal Phases

Chuliá-Jordán, R. ; Juárez-Pérez, E.

Resumen: Time-correlated single photon counting has been conducted to gain further insights into the short photoluminescence lifetimes (nanosecond) of lead iodide perovskite (MAPbI3) thin films (~100 nm). We analyze three different morphologies, compact layer, isolated island, and connected large grain films, from 14 to 300 K using a laser excitation power of 370 nJ/cm2. Lifetime fittings from the Generalized Berberan-Santos decay model range from 0.5 to 6.5 ns, pointing to quasi-direct bandgap emission despite the three different sample strains. The high energy band emission for the isolated-island morphology shows fast recombination rate centers up to 4.8 ns-1, compared to the less than 2 ns-1for the other two morphologies, similar to that expected in a good quality single crystal of MAPbI3. Low-temperature measurements on samples reflect a huge oscillator strength in this material where the free exciton recombination dominates, explaining the fast lifetimes, the low thermal excitation, and the thermal escape obtained. © 2022 American Chemical Society. All rights reserved.

Idioma: Inglés

DOI: 10.1021/acs.jpcc.1c08867

Año: 2022

Publicado en: Journal of physical chemistry. C. 126, 7 (2022), 3466-3474
ISSN: 1932-7447

Factor impacto JCR: 3.7 (2022)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 76 / 161 = 0.472 (2022) - Q2 - T2
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 157 / 343 = 0.458 (2022) - Q2 - T2
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 62 / 107 = 0.579 (2022) - Q3 - T2

Factor impacto CITESCORE: 7.0 - Materials Science (Q1) - Chemistry (Q1) - Energy (Q2)

Factor impacto SCIMAGO: 1.028 - Electronic, Optical and Magnetic Materials (Q1) - Energy (miscellaneous) (Q1) - Surfaces, Coatings and Films (Q1) - Physical and Theoretical Chemistry (Q1) - Nanoscience and Nanotechnology (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/TEC2014-53727-C2-1-R/2-R
Financiación: info:eu-repo/grantAgreement/EC/H2020/704998/EU/Long Range Surface Plasmon Polaritons as an Alternative Information Carrier for Nanoscale Quantum Circuitry/QuP
Financiación: info:eu-repo/grantAgreement/ES/MCIU/PID2019-107314RB-I00

Tipo y forma: Article (Published version)