Band-Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Hong-Hua Fang, Jie Yang, Sampson Adjokatse, Eelco Tekelenburg, Machteld E. Kamminga, Herman Duim, Jianting Ye, Graeme R. Blake, Jacky Even, Maria Antonietta Loi*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

16 Citaten (Scopus)
83 Downloads (Pure)

Samenvatting

2D perovskite materials have recently reattracted intense research interest for applications in photovoltaics and optoelectronics. As a consequence of the dielectric and quantum confinement effect, they show strongly bound and stable excitons at room temperature. Here, the band-edge exciton fine structure and in particular its exciton and biexciton dynamics in high quality crystals of (PEA)2PbI4 are investigated. A comparison of bulk and surface exciton lifetimes yields a room temperature surface recombination velocity of 2 × 103 cm s−1 and an intrinsic lifetime of 185 ns. Biexciton emission is evidenced at room temperature, with a binding energy of ≈45 meV and a lifetime of 80 ps. At low temperature, exciton state splitting is observed, which is caused by the electron–hole exchange interaction. Transient photoluminescence resolves the low-lying dark exciton state, with a bright/dark splitting energy estimated to be 10 meV. This work contributes to the understanding of the complex scenario of the elementary photoexcitations in 2D perovskites.

Originele taal-2English
Artikelnummer1907979
Aantal pagina's9
TijdschriftAdvanced Functional Materials
Volume30
Nummer van het tijdschrift6
Vroegere onlinedatum9-dec-2019
DOI's
StatusPublished - 5-feb-2020

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