Perovskite quantum dots integrated in large-area luminescent solar concentrators

Zero‐Dimensional Perovskite Nanocrystals for Efficient Luminescent Solar Concentrators

“…High‐resolution TEM (HR‐TEM) image reveals the single‐crystal nature of Cs 4 PbBr 6 NCs (Figure b). The measured d spacing is around 0.43 nm, corresponding to the (31) plane of the rhombohedral crystal, which was further confirmed by selected area electron diffraction (SAED) patterns and X‐ray diffraction (XRD) pattern, showing a pure rhombohedral phase in space group R3̅c (167) (Figure c,e and Figure f, left). CsPbBr 3 perovskite NCs show a cubic/cuboidal shape with size of 8.5 ± 0.3 nm (Figure S1a, Supporting Information).…”

“…0D Cs 4 PbBr 6 NCs were synthesized through a modified reverse microemulsion method . For a comparison, 3D CsPb(Br) 3 NCs were also synthesized via a hot‐injection approach . Transmission electron microscopy (TEM) was used to characterize the morphology and structure of perovskites.…”

“…CsPbBr 3 perovskite NCs show a cubic/cuboidal shape with size of 8.5 ± 0.3 nm (Figure S1a, Supporting Information). The lattice distances were further measured by SAED patterns of CsPbBr 3 (Figure S1b, Supporting Information), which are well indexed to the cubic phase (Figure f, right) …”

“…Among various types of fluorophores, perovskite NCs have attracted a lot of attention as building blocks in LSCs, in view of their size/composition‐dependent absorption and emission spectra, high brightness with a PL QY up to 100%, and facile wet‐chemistry synthesis . For example, with the use of tributylphosphine ligands in the CsPbBr 3 synthesis, 100% of PL QY has been achieved for CsPbI 3 QDs and CsPbBr 3 nanoplatelets .…”

“…For example, with the use of tributylphosphine ligands in the CsPbBr 3 synthesis, 100% of PL QY has been achieved for CsPbI 3 QDs and CsPbBr 3 nanoplatelets . Recently, the LSCs have already been fabricated by coating perovskite thin‐film on the glass, or embedding inorganic 3D CsPbX 3 (X = Cl, Br, I), mixed‐halide CsPb(Br x I 1‐x ) 3 , and doped CsPbCl 3 NCs in polymer matrix, while the current obtained external optical efficiency (η opt ) in single‐layer LSCs based on perovskite NCs is still low . Although Mn‐doped CsPbCl 3 perovskite NCs (or Yb 3+ ‐doped CsPbCl 3 ) can be as reabsorption‐free emitters, Meinardi et al highlighted that CsPbCl 3 ‐based perovskites are not suitable for the highly efficient large‐area LSCs due to both their relatively low PL QY (<15%) and their wide energy gap (only absorb sunlight less than 400 nm).…”