While the unabated race persists in achieving record efficiencies in solar cells and other photonic/optoelectronic devices using lead halide perovskite absorbers, a comprehensive picture of the correlated third-order nonlinear optical (NLO) properties is yet to be established. The present study is aimed at deciphering the role of dopants in multiphoton absorption properties of intentionally engineered CsPbBr 3 colloidal nanocrystals (NCs). The charge separation of the plasmonsemiconductor conduction band owing to the hot electron transfer at the interface was demystified using the dynamics of the bleached spectral data from femtosecond (fs) transient absorption spectroscopy with broadband capabilities. The NLO properties studied through the fs Z-scan technique revealed that Ni-doped CsPbBr 3 NCs exhibited strong third-order NLO susceptibility of ∼10 −10 esu. The exotic photophysical phenomena in these pristine and Ni-doped CsPbBr 3 colloidal twodimensional (2D) NCs reported herein are believed to provide the avenues to address the critical variables involved in the structural differences and their correlated optoelectronic properties.

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An n-p type homostructural metal-free graphitic carbon nitride (g-C 3 N 4 ) semiconductor is designed and developed for pollutant abatement and energy storage application. The successful grafting of vibrio-like morphology-based g-C 3 N 4 by 2, 5-Thiophenedicarboxylic acid (TDA) molecule and the development of amide-type linkage substantiated the prosperous uniting of g-C 3 N 4 with organic TDA moiety is demonstrated. An extended π-conjugative TDA grafted g-C 3 N 4 exhibited band gap tunability with broadband optical absorbance in the visible region. Mott-Schottky analysis exhibited the formation of n-p type homostructural property. As a result, obtained TDA grafted g-C 3 N 4 has extended π-conjugation, high surface area and adequate separation of charge carriers. The change in the photocatalytic performance of grafted g-C 3 N 4 is inspected for degradation of acid violet 7 (AV 7) dye under visible light irradiation. The charge storage capacity of grafted g-C 3 N 4 was additionally assessed for supercapacitive behaviour. The charge capacitive studies of grafted g-C 3 N 4 exhibited the areal capacitance of 163.17 mF cm −2 and robust cyclic stability of 1000 cycles with capacity retention of 83%.

Molecular engineering of graphitic carbon nitride (g-C3N4) is achieved by the copolymerization of π-conjugated phenyl urea, melamine, and urea.

Visible light responsive, ferromagnetic, reusable Bi doped TiO2–ZrO2 nanocomposites exhibit enhanced photodegradation and mineralization of malachite green dye. Hydroxyl radicals, holes and superoxides are active species in photodegradation.

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Graphitic carbon nitride (g-C3N4) supported cadmium carbonate (CdCO3) as an organic–inorganic hybrid nanophotocatalyst was realised by an in situ microwave heating method.

SnS (tin sulfide) quantum dots (QDs) were synthesized by a chemical coprecipitation method using ethylene glycol as a solvent and capping agent and thiourea as a sulfur source at a temperature of 160 °C, 4 h.