Pressure response of decylammonium-containing 2D iodide perovskites
Marta Morana,
Rossella Chiara,
Boby Joseph,
Thomas B. Shiell,
Timothy A. Strobel,
Mauro Coduri,
Gianluca Accorsi,
Ausonio Tuissi,
Angelica Simbula,
Federico Pitzalis,
Andrea Mura,
Giovanni Bongiovanni,
Lorenzo Malavasi
Affiliations
Marta Morana
Department of Chemistry and INSTM, Viale Taramelli 16, 27100 Pavia, Italy; Corresponding author
Rossella Chiara
Department of Chemistry and INSTM, Viale Taramelli 16, 27100 Pavia, Italy
Boby Joseph
Elettra-Sincrotrone Trieste S. C. P. A., S.S. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy
Thomas B. Shiell
Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA
Timothy A. Strobel
Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA
Mauro Coduri
Department of Chemistry and INSTM, Viale Taramelli 16, 27100 Pavia, Italy
Gianluca Accorsi
CNR Nanotec, Institute of Nanotechnology, c/o Campus Ecotekne, via Monteroni, 73100 Lecce, Italy
Ausonio Tuissi
CNR–Consiglio Nazionale Delle Ricerche, Istituto di Chimica Della Materia Condensata e di Tecnologie per L’Energia, Via Previati 1/e, 23900 Lecco, Italy
Angelica Simbula
Department of Physics, University of Cagliari, Cittadella Universitaria S.P. Monserrato-Sestu km 0.7, 09042 Monserrato, Italy
Federico Pitzalis
Department of Physics, University of Cagliari, Cittadella Universitaria S.P. Monserrato-Sestu km 0.7, 09042 Monserrato, Italy
Andrea Mura
Department of Physics, University of Cagliari, Cittadella Universitaria S.P. Monserrato-Sestu km 0.7, 09042 Monserrato, Italy
Giovanni Bongiovanni
Department of Physics, University of Cagliari, Cittadella Universitaria S.P. Monserrato-Sestu km 0.7, 09042 Monserrato, Italy
Lorenzo Malavasi
Department of Chemistry and INSTM, Viale Taramelli 16, 27100 Pavia, Italy; Corresponding author
Summary: Manipulation by external pressure of the optical response of 2D Metal Halide Perovskites (MHPs) is a fascinating route to tune their properties and promote the emergence of novel features. We investigate here DA2PbI4 and DA2GeI4 (DA = decylammonium) perovskites in the pressure range up to ∼12 GPa by X-ray powder diffraction, absorption, and photoluminescence spectroscopy. Although the two systems share a similar structural evolution with pressure, the optical properties are rather different and influenced by Pb or Ge. DA2PbI4 shows a progressive red shift from 2.28 eV (P = 0 GPa) to 1.64 eV at 11.5 GPa, with a narrow PL emission, whereas DA2GeI4, changes from a non-PL system at ambient pressure to a clear broadband emitter centered around 730 nm with an intensity maximum at about 3.7 GPa. These results unveil the role of the central atom on the nature of emission under pressure in 2D MHPs containing a long alkyl chain.
