Charge transport in thin films of MDMO PPV dispersed with lead sulfide nanoparticles

Mohan, S. Raj; Joshi, M. P.; Dhami, T. S.; Awasthi, Vishnu; Shalu, C; Singh, Balwant; Singh, Vipul

doi:10.1016/j.synthmet.2016.12.024

Cited by 8 publications

(3 citation statements)

References 56 publications

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“…In the presence of DP NCs, the PIA feature of MDMO-PPV polymers disappears at 550–610 nm ( Figure 3 b). The GSB feature from 470–520 nm weakened, with an emergent TA signal at 335 nm, which originated from the GSB feature of Mn-doped DP NCs, as illustrated in Figure 3 c. The SE feature of DP NCs/MDMO-PPV nanocomposites (600–650 nm) blue shifted relative to MDMO-PPV polymers at 630–680 nm due to the electric field produced by excess electrons on the DP NC surfaces, which elevated the lowest excited state of the DP NCs [ 34 , 35 ]. We investigated the TA dynamic trajectories at different probe wavelengths to understand the revolution in the time domain.…”

Section: Resultsmentioning

confidence: 99%

Photon-Energy-Dependent Reversible Charge Transfer Dynamics of Double Perovskite Nanocrystal-Polymer Nanocomposites

Wang

Luo

et al. 2022

Nanomaterials

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Combining steady-state photoluminescence and transient absorption (TA) spectroscopy, we have investigated the photoinduced charge transfer dynamics between lead-free Mn-doped Cs2NaIn0.75Bi0.25Cl6 double perovskite (DP) nanocrystals (NCs) and conjugated poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV). Upon ultraviolet-A excitation, the photoinduced absorption feature of DP NCs/MDMO-PPV nanocomposites disappeared, and the stimulated emission weakened in the TA spectrum. This was due to charge transfer from the MDMO-PPV polymers to DP NCs. Upon a higher photon-energy ultraviolet-C excitation, stimulated emission and photoinduced absorption features vanished, indicating there existed a reversible charge transfer from DP NCs to MDMO-PPV polymers. Reversible charge transfer of Mn-doped DP NCs/MDMO-PPV nanocomposites was tuned by varying the excitation photon-energy. The manipulation of reversible charge transfer dynamics in the perovskite-polymer nanocomposites opens a new avenue for optical and optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Photon-Energy-Dependent Reversible Charge Transfer Dynamics of Double Perovskite Nanocrystal-Polymer Nanocomposites

Wang

Luo

et al. 2022

Nanomaterials

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“…Slowly orange solution was converted to dark after mixing with thioacetamide. The solution heated in steel autoclave at 160 °C for 24 h. The red precipitates dried in ethanol and byproducts are extracted by centrifugation [ 150 ].…”

Section: Synthesis and Characteristics Of Polymer Matrix Compositementioning

confidence: 99%

Polymeric Materials for Conversion of Electromagnetic Waves from the Sun to Electric Power

et al. 2018

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Solar photoelectric energy converted into electricity requires large surface areas with incident light and flexible materials to capture these light emissions. Currently, sunlight rays are converted to electrical energy using silicon polymeric material with efficiency up to 22%. The majority of the energy is lost during conversion due to an energy gap between sunlight photons and polymer energy transformation. This energy conversion also depends on the morphology of present polymeric materials. Therefore, it is very important to construct mechanisms of highest energy occupied molecular orbitals (HOMO)s and the lowest energy unoccupied molecular orbitals (LUMO)s to increase the efficiency of conversion. The organic and inorganic solar cells used as dyes can absorb more photons from sunlight and the energy gap will be less for better conversion of energy to electricity than the conventional solar cells. This paper provides an up-to-date review on the performance, characterization, and reliability of different composite polymeric materials for energy conversion. Specific attention has been given to organic solar cells because of their several advantages over others, such as their low-energy payback time, conversion efficiency and greenhouse emissions. Finally, this paper provides the recent progress on the application of both organic and inorganic solar cells for electric power generations together with several challenges that are currently faced.

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“…One method that has been widely employed to investigate the charge transport in various materials is the time-of-flight (ToF) technique, − in particular, for the study of hole transport in QD-doped polymers. However, the effects of the QDs on the charge transport remain unclear, − since in some cases the presence of the QDs improves the charge carrier mobility, ,,, whereas in other studies the QDs act as hole traps reducing the mobility. , Furthermore, another case shows an initial reduction in carrier mobility at low QD concentrations followed by a recovery at high concentrations . In fact, when the valence band of the QDs is located below the highest occupied molecular orbital (HOMO) of the OSC, it is ambiguous as to why the QDs even act as hole traps.…”

Section: Introductionmentioning

confidence: 99%

Energetics of Nonradiative Surface Trap States in Nanoparticles Monitored by Time-of-Flight Photoconduction Measurements on Nanoparticle–Polymer Blends

Guo

Gong

Borowiec

et al. 2019

ACS Appl. Mater. Interfaces

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Nanoparticles (NPs) have had increasingly successful applications including in emissive or photovoltaic devices; however, trap states associated with the surface of NPs often drastically reduce the efficiency of devices and are difficult to detect spectroscopically. We show the applicability of photoconduction as the means of detecting and quantifying trap states in NPs. We performed time-of-flight (ToF) photoconduction measurements, using semiconducting poly[bis(4-phenyl)(4-butyphenyl)amine] (P-TPD) doped with either core/shell CdSeS/CdS quantum dots (QDs) or perovskite CsPbBr 3 NPs, both of which are carefully designed to be energetically matched. In the case of the QDs, a drop in the hole mobility from ∼10 −3 to ∼10 −4 cm 2 V −1 s −1 was observed when compared to a control sample, suggesting the presence of a hole trapping. These trap states were found to be around −5.0 to −4.9 eV from the vacuum level. The presence of the trap states was further supported by a coincident reduction in the photoluminescence (PL), quantum yield (QY), and lifetime of the core/shell QDs after purification. Using the measured reductions in the PL, QY, and lifetime, the surface trap state density was estimated to increase by between 20 and 40%, most likely due to a ligand detachment. In the case of the perovskite NP-doped samples, a mobility of ∼10 −3 cm 2 V −1 s −1 was measured. Thus, doping with perovskite NPs did not generate any obvious hole trapping from the P-TPD matrix. The absence of a trapping may be related to the reduced surface-to-volume ratio and NP number density of the perovskite NPs compared to the core/shell QDs, since the perovskite NPs are approximately 10 times larger in radius than that of the core/shell QDs. Our results suggest that to minimize the presence of trap states with a view to improving device performance, large-size perovskite NPs appear to be better than small-size QDs.

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Charge transport in thin films of MDMO PPV dispersed with lead sulfide nanoparticles

Cited by 8 publications

References 56 publications

Photon-Energy-Dependent Reversible Charge Transfer Dynamics of Double Perovskite Nanocrystal-Polymer Nanocomposites

Photon-Energy-Dependent Reversible Charge Transfer Dynamics of Double Perovskite Nanocrystal-Polymer Nanocomposites

Polymeric Materials for Conversion of Electromagnetic Waves from the Sun to Electric Power

Energetics of Nonradiative Surface Trap States in Nanoparticles Monitored by Time-of-Flight Photoconduction Measurements on Nanoparticle–Polymer Blends

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