Photoinduced Charge Separation in Semiconductor‐Quantum‐Dot/Organic‐Molecule Hybrids

Abstract

Semiconductor colloidal quantum dot/organic molecule nanohybrids are gaining momentum due to the relative ease with which an efficient photoinduced charge transfer in the desired direction can be achieved between the dot and the molecule. At the same time analysis of the experimental studies of such systems, and in particular transient absorption spectroscopy data, is a challenging task because of the statistical nature of hybrid formation and the complex kinetics of the photoreactions. This Minireview aims to find common ground for comparing the photoinduced charge‐separation reactions in quantum dot/organic molecule hybrids. It also discusses a common set of parameters which would help to compare different quantum dot/molecule hybrids as well as progress in developing design principles to achieve controllable photoinduced charge separation in such hybrids.

B‐Site Co‐Alloying with Germanium Improves the Efficiency and Stability of All‐Inorganic Tin‐Based Perovskite Nanocrystal Solar Cells

“…Apparently, the emission decay of CsSnI 3 NCs is faster than that of CsSn 0.6 Ge 0.4 I 3 NCs. Poisson statistics of defects distribution in PNCs have been employed to model decays and fit the experimental data (see the detail of the Poisson model in Supporting Information) [42, 43] . It was found that two types of defects need to be assumed to obtain a reasonable data fit.…”

“…We then turn to assess the PL dynamics of as-synthesized nanocrystals by conducting the time-correlated single photon counting (TCSPC) measurements in the pico-and nanosecond regime.T he PL decays of nanocubes in suspension are presented in Figure 3a.A pparently,t he emission decay of CsSnI 3 NCs is faster than that of CsSn 0.6 Ge 0.4 I 3 NCs.P oisson statistics of defects distribution in PNCs have been employed to model decays and fit the experimental data (see the detail of the Poisson model in Supporting Information). [42,43] It was found that two types of defects need to be assumed to obtain ar easonable data fit. Thef itting results are shown in the Supporting Information, Table S2, where t is the quenching time constant in ananocrystal having exactly one defect and c is the relative defect concentration, or the average number of defects per nanocrystal.…”

High‐Yield Generation of Triplet Excited States by an Efficient Sequential Photoinduced Process from Energy Transfer to Singlet Fission in Pentacene‐Modified CdSe/ZnS Quantum Dots

“…Based on these results, an energy‐transfer process from QD to pentacene units efficiently occurred in Pc‐QD. Noted that the two different methods using functions based on Poisson statistics and exponentials were already reported as the fitting methods for evaluation of the rate constants of the energy‐transfer process from QDs to chromophores. In this case, we employed the exponential function because at the relative ratio of 1:6 used in this study the statistical nature of the complexes formation has no strong effect on the decay dynamics.…”

B‐Site Co‐Alloying with Germanium Improves the Efficiency and Stability of All‐Inorganic Tin‐Based Perovskite Nanocrystal Solar Cells

“…Poisson statistics of defects distribution in PNCs have been employed to model decays and fit the experimental data (see the detail of the Poisson model in Supporting Information). [42,43] It was found that two types of defects need to be assumed to obtain a reasonable data fit. The fitting results are shown in the Supporting Information, Table S2, where t is the quenching time constant in a nanocrystal having exactly one defect and c is the relative defect concentration, or the average number of defects per nanocrystal.…”