Toward strong nonlinear optical absorption properties of perovskite films via porphyrin axial passivation

Donor–π–Acceptor Porphyrin-Assisted Bifunctional Defect Passivation for Enhanced Temporal Domain-/Wavelength-Dependent Nonlinear Absorption Properties in Perovskite Films

“…After rapid high-temperature thermal annealing, perovskite films tend to undergo an irreversible crystal orientation transition from (002) to (110) . We noticed that in MAPbI 3 /Por1 , MAPbI 3 /Por2 , and MAPbI 3 /Por3 films, the (002) crystal plane bulging peaks were lost, which indicates that the porphyrin modification is beneficial for the growth of perovskite films on the (110)-oriented crystal plane . Similar results were also seen with the (220) crystal plane in Figure S10b.…”

“…34 We noticed that in MAPbI 3 /Por1, MAPbI 3 /Por2, and MAPbI 3 /Por3 films, the (002) crystal plane bulging peaks were lost, which indicates that the porphyrin modification is beneficial for the growth of perovskite films on the (110)-oriented crystal plane. 13 Similar results were also seen with the (220) crystal plane in Figure S10b. There is a small (004) convex peak in the pristine perovskite film, but it disappears in the porphyrin-modified perovskite films, indicating that porphyrin promotes the growth of perovskite on the (220) crystal plane.…”

“…11,12 Moreover, the defects would also allow air and water in the external environment to infiltrate the perovskite lattice and induce the degradation of the perovskite inorganic octahedral lattice, thereby resulting in deterioration of the optoelectronic properties of perovskites, especially the NLO properties. 13 Thus, addressing perovskite defects to improve the structural stability of perovskites has become a pressing problem to be solved for developing such NLO materials and constructing high-performance perovskite-based photonic devices. According to research reports, the passivation of defects is recognized as an effective strategy for optimizing the perovskite structure and improving the photoelectric performance of perovskites.…”

“…Although perovskite exhibits excellent optoelectronic properties, its further development is hindered by various ionic defects generated during the crystallization process, such as positive vacancy defects caused by I – loss and negative vacancy defects generated by the escape of organic cations . These defects easily beget diverse trap states that trap normal electrons, hindering the transport of charge carriers, which results in nonradiative charge recombination and energy loss. , Moreover, the defects would also allow air and water in the external environment to infiltrate the perovskite lattice and induce the degradation of the perovskite inorganic octahedral lattice, thereby resulting in deterioration of the optoelectronic properties of perovskites, especially the NLO properties . Thus, addressing perovskite defects to improve the structural stability of perovskites has become a pressing problem to be solved for developing such NLO materials and constructing high-performance perovskite-based photonic devices.…”

0D MXene quantum dots/2D MXene derived metal–organic frameworks for enhanced nonlinear optical absorption across spectral and temporal regimes

“…Nonlinear optical (NLO) materials play a pivotal role in various optical applications, such as optical limiting, optical switching, optical communications, and so on. [1][2][3] A wide range of materials has captured significant attention, including graphene, [4][5][6] transition metal sulfides, [7][8][9][10][11][12][13] black phosphorus, 14,15 perovskite, [16][17][18] polymers, 19,20 and MXene, [21][22][23][24][25][26] among others. Within these NLO materials, metal-organic frameworks (MOFs), [27][28][29] boasting tunable structures and diverse compositions, have emerged as ideal materials for NLO applications.…”