In situ CsPbBr₃ architecture engineered in electrospun fibers and its ultrafast charge-transfer dynamics

Abstract

All inorganic lead halide perovskite nanocrystals (NCs) have witnessed a rapid progression in the field of optoelectronic as well as photovoltaic application. However, environmental instability, tedious synthesis protocols and post...

Unveiling the Ultrafast Electron Transfer Dynamics in Epitaxial Dodecahedron CsPbBr3/Au Heterostructure

“…The binding energy of Pb 4f 5/2 and Pb 4f 7/2 were noticed at 142.5 and 137.5 eV, respectively (Figure 4c). Similarly, the peak located at 68.6 and 67.5 eV can be ascribed to the spin‐orbit splitting of Br 3d 3/2 and Br 3d 5/2 , respectively (Figure 4d), which matches with previously reported literature [32,38,39] . The binding energy of Au 4f 5/2 and Au 4f 7/2 were noticed at 83.1 and 86.8 eV, respectively (Figure 4e).…”

“…This effect is quite prominent in heterostructures consist of small size of Au. In that case spectral features correlated with surface plasmon oscillation of Au are completely absent from the TA spectra [53] Earlier, similar suppression of Au resonance has been noticed in the CdSe‐Au [44,54] and CdS‐Au [53] based heterostructures as well as nanocube CsPbBr 3 /Au heterostructure [16–46] where size of Au NPs in heterostructure is less than 4 nm. Altogether, the fast decay and small size of Au NPs leads to the overlapping with the spectral features of CsPbBr 3 , we didn't observe the spectral features of Au in the normal TA spectra.…”

“…Similarly, the peak located at 68.6 and 67.5 eV can be ascribed to the spin-orbit splitting of Br 3d 3/2 and Br 3d 5/2 , respectively (Figure 4d), which matches with previously reported literature. [32,38,39] The binding energy of Au 4f 5/2 and Au 4f 7/2 were noticed at 83.1 and 86.8 eV, respectively (Figure 4e). [40] XPS analysis has clearly demonstrated the presence of Au (0) in the CsPbBr 3 /Au heterostruc- ture.…”

Water‐Triggered Chemical Transformation of Perovskite Nanocrystals

“…Surface passivation by encapsulation with another material with formation of heterostructure could be easiest approach to enhance the stability against moisture and air, as has been observed for several other semiconductors [17] . Although encapsulation with polymer was achieved in a few occasions, [4b,18] however, for perovskites it was extremely challenging to encapsulate with another semiconductor, especially in the single‐particle level, rendering their long‐term stability. Using water‐triggered interfacial approach, recently Zhang group developed a strategy to synthesize a heterostructure of CsPbX3/oxide Janas nanoparticles by encapsulating with SiO 2 or Ta 2 O 5 semiconductors [11c] .…”

Highly stable CsPbBr3/ PMA perovskite nanocrystals for improved optical performance

“…Babu et al synthesized highly stable CsPbBr 3 incorporated poly (vinylidene fluoride)-co-hexafluoropropylene fibers employing electrospinning technique and studied the charge-transfer dynamics employing transient absorption (TA) spectroscopy. These results provided a number of photophysical insights and would pave the way for the development of flexible and highly efficient solar cells and photodetector devices [ 24 ]. Peng et al synthesized polymer-encapsulated Zn-doped CsPbBr x Cl 3–x PNCs-based color converters to mitigate the challenges of blue overshoot and cyan gaps in white light-emitting diodes [ 25 ].…”