Zero‐Dimensional Perovskite Nanocrystals for Efficient Luminescent Solar Concentrators

Abstract

Luminescent solar concentrators (LSCs) are able to efficiently harvest solar energy through large-area photovoltaic windows, where fluorophores are delicately embedded. Among various types of fluorophores, all-inorganic perovskite nanocrystals (NCs) are emerging candidates as absorbers/emitters in LSCs due to their size/composition/dimensionality tunable optical properties and high photoluminescence quantum yield (PL QY). However, due to the large overlap between absorption and emission spectra, it is still challenging to fabricate high-efficiency LSCs. Intriguingly, zero-dimensional (0D) perovskites provide a number of features that meet the requirements for a potential LSC absorber, including i) small absorption/emission spectral overlap (Stokes shift up to 1.5 eV); ii) high PL QY (>95% for bulk crystal); iii) robust stability as a result of its large exciton binding energy; and iv) ease of synthesis. In this work, as a proof-of-concept experiment, Cs 4 PbBr 6 perovskite NCs are used to fabricate semi-transparent large-area LSCs. Cs 4 PbBr 6 perovskite film exhibits green emission with a high PL QY of ≈58% and a small absorption/emission spectral overlap. The optimized LSCs exhibit an external optical efficiency of as high as 2.4% and a power conversion efficiency of 1.8% (100 cm 2 ). These results indicate that 0D perovskite NCs are excellent candidates for high-efficiency LSCs compared to 3D perovskite NCs.

Colloidal Synthesis and Optical Properties of All‐Inorganic Low‐Dimensional Cesium Copper Halide Nanocrystals

“…On the other hand, both samples show large Stokes shifts,w hich can efficiently prevent self-absorption by the system. [13] Furthermore,t he most intense peaks in the PLE spectra of the CsCu 2 I 3 NRs and Cs 3 Cu 2 I 5 NCs are at l = 324 and 297 nm ( Figure S1), respectively,c onsistent with their corresponding UV/Vis absorption spectra.…”

A Review of Diverse Halide Perovskite Morphologies for Efficient Optoelectronic Applications

“…In particular, the 0D perovskite NCs have showcased several outstanding advantages when applied as potential materials for high‐efficiency LSCs, including the small absorption/emission spectral overlap (i.e., Stokes shift up to 1.5 eV), high PLQY (i.e., >95% for bulk crystal) and robust stability. For instance, the Cs 4 PbBr 6 ‐based LSCs (with an active working area of ≈100 cm 2 ) showcased an external optical efficiency of 2.4% and a PCE of 1.8% . Metal halide perovskites are also suitable to be used in ionic radiation detection due to their high atomic number ( Z ) and high carrier mobility .…”

“…For instance, the Cs 4 PbBr 6 -based LSCs (with an active working area of ≈100 cm 2 ) showcased an external optical efficiency of 2.4% and a PCE of 1.8%. [57] Metal halide perovskites are also suitable to be used in ionic radiation detection due to their high atomic number (Z) and high carrier mobility. [58] Recently, a direct detection of soft-X-ray-induced photocurrent was realized in CsPbBr 3 QDs-based X-ray detectors ( Figure 7g).…”

Earth abundant colloidal carbon quantum dots for luminescent solar concentrators

“…PbS/CdS, CdSe/CdS, and CuInSe/ZnS) are very sensitive to oxygen and moisture during the synthesis, purification and LSC preparation process, 8,38,[44][45][46][47] and some QDs contain toxic elements (e.g. Cd and Pb), [48][49][50][51] environmentally sensitive elements (e.g. Se and S), 38,47 or non-earth-abundant and expensive metals (e.g.…”

“…In some of the C-dots reported in the literature, they have a relatively large Stokes shift (200 to 840 meV), 74,96,103,104,118 which is comparable to the large Stokes shift reported for inorganic QDs. 39,40,51,53,120,121 UV C-dots have a large Stokes shift of 275-840 meV (Table 2). 74,103,104,118 Some visible C-dots have a large Stokes shift in the range of 100-550 meV (Table 2).…”