Excitons in a single two-dimensional semiconductor crystal of H3N(CH2)6NH3PbI4

X-ray diffraction, vibrational and photoluminescence studies of the self-organized quantum well crystal H3N(CH2)6NH3PbBr4

“…It is also noteworthy that the title compound is isostructural with the iodide homologous compound (NH 3 (CH 2 ) 6 NH 3 )PbI 4 [27]. It has the same space group P2 1 /a and almost the same spacing between the inorganic layers (11.18 Å ).…”

“…In previous works [27] on the (R-NH 3 )PbI 4 iodide compounds, it has been established that the dielectric confinement enhances the photoluminescence and the bending energy of excitons. This was demonstrated by using different organic chains (e.g.…”

“…This was demonstrated by using different organic chains (e.g. simple saturated organic chains and unsaturated chains including aromatic rings [27] and delocalized p electrons). When the organic layers contain saturated alkylammonium chains, the excitonic properties are almost independent of the chain length and thus of the spacing between the PbI 4 wells.…”

Electronic properties of hybrid organic–inorganic semiconductors

“…Based on a suitable chemical reaction (e.g., solvothermal or solution growth), inorganic semiconductor crystal segments can self-assemble into regular networks linked by insulating organic molecules on an atomic scale. The method is very tailorable, and by varying cation, anion, as well as the length of the organic spacer, many new materials have been synthesized, in layered perovskites, [2][3][4] and in some of the well-known II-VIs. [5][6][7][8][9][10][11] The latter has been demonstrated 6 to be a very flexible system that can form large extended networks of both planar and line (wire) segments.…”

Inorganic–Organic Perovskite Solar Cells

“…This is due to the small difference between the dielectric constants of the inorganic and organic layers which leads to a rather weak impact of the dielectric confinement (see, for instance, the work of Ishihara et al on (C n H 2n+1 NH 3 )PbI 4 with n = 4, 6, 8,..., 12). In contrast, when the organic chains consist of aromatic rings and delocalized p electrons, the binding energy of exciton is low because of the difference between the organic and inorganic dielectric constants (dielectric confinement effect) and the luminescence peak shows red shift [41][42][43][44]. This dependence of the saturated/unsaturated nature of the organic chains is summarized in Table 1.…”