Recent progress of copper halide perovskites: properties, synthesis and applications

Abstract

With the growing safety concerns related to the toxicity of lead halide perovskite, there is an urgent need for novel lead-free alternatives. Recently, copper halide perovskite (CHP) attracted much attention...

Evidence of Short-Lived High-Energy Emissive State and Triplet Character of the Self-Trapped Exciton in Cs3Cu2I5 Perovskite

“…The PLE spectra were also found to be independent of the observed emission wavelength (Figure c). The aforementioned findings demonstrate that the broad PL of the Cs 3 Cu 2 I 5 NR originates from a single excited state, which is in line with the previous reports. − This further proves the phase purity of the synthesized Cs 3 Cu 2 I 5 NRs. As Cs 3 Cu 2 I 5 has a 0D structure, its optical properties are concentric on a single [Cu 2 I 5 ] 3– unit.…”

“…12−14 These materials profoundly show a large Stokesshifted PL, which is ideal for the self-absorption-free PL properties that can be used as solar concentrators. 13,14 The origin of the large Stokes-shifted PL lies in the structures of these materials. In copper halide perovskites, the copper is in a +1 oxidation state.…”

“…Toward this goal, the copper halide perovskite was introduced by Jun et al in 2018 . The two forms of copper halide perovskites, Cs 3 Cu 2 X 5 and CsCu 2 X 3 (X = Cl, Br, I), have become popular because of their superior PL characteristics. − These materials profoundly show a large Stokes-shifted PL, which is ideal for the self-absorption-free PL properties that can be used as solar concentrators. , The origin of the large Stokes-shifted PL lies in the structures of these materials. In copper halide perovskites, the copper is in a +1 oxidation state.…”

All-inorganic copper-halide perovskites for large-Stokes shift and ten-nanosecond-emission scintillators

“…In particular, we note that the QY of mechanically ground CsCu 2 I 3 is fairly comparable to those of its single-crystal (18%) 80 and nanocrystals (11%) 61 and differs in contrast with those of mechanochemically-synthesised powder (6%) 33 and thin films (20.6%). 81 In the case of Cs 3 Cu 2 I 5 , the corresponding QY is fairly competitive compared to those reported for single-crystals (93.5%), 80 microcrystals (60%), 48 thin films (up to 91%), 60,82,83 nanocrystals (87%), 61 and mechanochemically-synthesised powder (62%). 33 In terms of the QY value in mechanochemically-synthesised CHPs, we consider this to be related to the irregularities of the hand-grinding method.…”

“…56 This structural divergence leads to two different views in the community, with some not recognising CHP as a perovskite. Nevertheless, a part of the community perceives CHP as a variant of perovskites, 57–60 a stance which is adopted in this study. FTIR and Raman spectra of the CHPs are presented in Fig.…”