Abstract
A charge transfer study between lead halide-based perovskite nanocrystals and single-walled carbon nanotubes (PNC@CNT nanocomposite) was performed. Solution-processed MAPbX3 PNCs displayed very bright luminescence, but it quenched in the presence of CNTs. This was attributed to the electron transfer from PNCs to CNTs. The detailed changes in fluorescence lifetime were investigated through time-correlated single-photon counting (TCSPC), which suggested mixed static and dynamic quenching along with a decrease in the lifetime. Morphological changes were investigated via transmission electron microscopy (TEM) and attributed to the incorporation of PNCs on long CNTs. Also, the PNC@CNT nanocomposite was explored for photoinduced current response, which indicated an ∼3 fold increase in photoconductivity under light illumination (with a 1 mV bias). This electron transfer study between PNCs and CNTs contributes to the exploration of charge dynamics.
Highlights
The mechanistic investigation of carbon nanotubes (CNTs) and quantum dots revealed that the excited states of uorescent quantum dots donate either excited electrons or holes to CNTs, which leads to the quenching of the photoluminescence.[25]
The quenching experiment was performed with the sequential addition of CNT solution (0.01% w/v in chloroform) from 10 mL to 300 mL
A prototype device was fabricated to investigate the conductive properties of the perovskite nanocrystals (PNCs)@CNT nanocomposite
Summary
Metal halide perovskites[1] have emerged among the superior materials for optoelectronic devices[2,3,4] including light-emitting diodes,[4] solar cells,[5,6] photodetectors, lasers, and in light harvesting.[2,3,8,9,10,11,12] The efficacy of these applications relies on good absorption characteristics, easy charge carrier formation and transport in these materials.[2,13,14,15] Besides, the low-cost solution synthesis of these perovskite nanocrystals (PNCs) results in intense uorescence and nearly unity quantum yield.[2,16,17,18,19,20,21] On the other hand, the strong con nement of carbon nanotubes (CNTs) to one dimension has attracted the attention of the scienti c community in the areas of charge transport, eld emission, gas storage, photodetectors and other photovoltaic applications.[22,23] Advancement in this research eld has been probed through various photo-responsive CNT-based nanocomposites with organic uorophores and inorganic moieties including conventional quantum dots (e.g., CdSe/ZnS).[24,25,26,27,28] The mechanistic investigation of CNTs and quantum dots revealed that the excited states of uorescent quantum dots donate either excited electrons or holes to CNTs, which leads to the quenching of the photoluminescence.[25].
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