Förster Resonance Energy Transfer Assisted Enhancement in Optoelectronic Properties of Metal Halide Perovskite Nanocrystals

Abstract

Regulated excited state energy and charge transfer play a pivotal role in nanoscale semiconductor device performance for efficient energy harvesting and optoelectronic applications. Herein, we report the influence of Forster resonance energy transfer (FRET) on the excited-state dynamics and charge transport properties of metal halide perovskite nanocrystals (PNCs), CsPbBr 3 , and its anion-exchanged counterpart CsPbCl 3 with CdSe/ZnS quantum dots (QDs). We report a drop in the FRET efficiency from ∼85% (CsPbBr 3 ) to ∼5% (CsPbCl 3 ) with QDs, inviting significant alteration in their charge transport properties. Using two-probe measurements we report substantial enhancement in the current for the blend structure of PNCs with QDs, originating from the reduced trap sites, compared to that of the pristine PNCs. The FRET-based upshot in the conduction mechanism with features of negative differential resistance and negligible hysteresis for CsPbBr 3 PNCs can add new directions to high performance-based photovoltaics and optoelectronics.

Perovskite photocatalysis: realizing long-lived charge-separated states at the interface of CsPbBr3nanocrystals and functionalized ferrocene molecules

“…Such large K app values imply strong binding between the molecule and the NCs, indicating substantial accessibility of surface sites by the redox-active FcS species for interaction and charge transfer. 44 Moreover, to the best of our knowledge, K app values for a system similar to ours have not been reported as high as these yet (Table 1), 45–52 which adds up to our motivation behind probing the charge transfer dynamics in CsPbBr 3 NCs using these Fc derivatives. Nevertheless, we observed a significant difference between the K app values for our molecules, following the order of K app (FcS4) > K app (FcS1) > K app (FcS2), and a similar trend was followed by the emission quenching data (Fig.…”

Energy Funneling from Water-Dispersed Perovskites to Chromophores

“…We also observed an increase in the acceptor emission decay (Figure b). These observations can be accounted for by considering effective energy transfer from PNCs to RITC. − ,,, The kinetic parameters obtained upon triple-exponential fitting of all the PL decay profiles are summarized in Table S1. Among all five donor samples, the largest decrease in τ avg (∼58.3%) was seen for PNC-X1.…”

Deciphering the Relevance of Quantum Confinement in the Optoelectronics of CsPbBr3 Perovskite Nanostructures

“…PNPL structures with two and three monolayers with 1.2 and 2 nm thicknesses have been synthesized with a similar protocol by Bohn et al 28 The TEM micrographs of the as-synthesized PQD reflect a cubic structure (Figure 1b). 30,31 The highly crystalline PQD possesses a crystal lattice spacing of 4.3 Å (Figure 1e), while the size distribution gives an edge length of around (9.18 ± 0.22) nm (Figure 1h). Again, the PNR shows an elongated structure like typical nanorods (Figure 1c) with a lattice spacing of 4.2 Å (Figure 1f).…”

“…This is in good agreement with previous literature reports on the PNPL. − Gaussian fitting to the size distribution histograms yields an average edge length of 165 nm with a thickness of 2.1 nm, suggesting the formation of the three-monolayer PNPL. PNPL structures with two and three monolayers with 1.2 and 2 nm thicknesses have been synthesized with a similar protocol by Bohn et al The TEM micrographs of the as-synthesized PQD reflect a cubic structure (Figure b). , The highly crystalline PQD possesses a crystal lattice spacing of 4.3 Å (Figure e), while the size distribution gives an edge length of around (9.18 ± 0.22) nm (Figure h). Again, the PNR shows an elongated structure like typical nanorods (Figure c) with a lattice spacing of 4.2 Å (Figure f).…”