## 1 Introduction  
Metal halide perovskites (MHPs) with ABX\({}_{3}\) structure (A = Cs\({}^{+}\); methylammonium, MA\({}^{+}\); formamidinium, FA\({}^{+}\); B = Pb\({}^{2+}\); X = Cl\({}^{-}\), Br\({}^{-}\), I\({}^{-}\) and combinations) have been established as the most promising semiconductor materials during the last decade, achieving important breakthroughs mainly in photovoltaics and optoelectronics. Here, MHPs have allowed for improving the photoconversion efficiencies of solar cell devices, for instance, prominent perovskite-CIGS monolithic tandem solar cells reaching values closer to 30% [1, 2], and the fabrication of efficient light-emitting diodes (LEDs), with external quantum efficiencies (EQEs) >28% [3, 4]. However, most of the great advances related to device stability in the above technologies have been limited via iodide-based MHPs, triggered by phase transformation of the photocuactive black \(\alpha\)-phase to the non-photoactive yellow \(\delta\)-phase under ambient conditions [5, 6, 7]. The preparation of nanoconfined MHPs, also known as perovskite nanocrystals (PNCs), has attracted growing interest, allowing the phase and optical stabilization of the photoactive black \(\alpha\)-phase in iodide-PNCs under high relative humidity and aerobic conditions [7, 8]. Considering that the PNC sizes are in the atomic scale, the quantum confinement effect emerges to provide outstanding features to these materials, such as versatile surface chemistry [9], band gap tunability (varying the composition or particle size) [7, 10], admirable tolerance to defects [11, 12], improved light harvesting and carrier transport abilities [13], and facile synthesis [14]. These intrinsic characteristics have expanded the use of PNCs in laser [15], photodetectors [16], photo(electro)catalysis [17, 18],and scintillators [19], among other interesting applications. More specifically, the carrier transfer ability of the PNCs has been used to prepare PNCs-composites with chalcogenide-based semiconductors as in the case of CsPbBr\({}_{3}\) PNCs/TiSe\({}_{2}\) nanosheets (NS) [20]. Here, TiSe\({}_{2}\) NS mediates the electron mobility from the nanocrystals to the optoelectronic devices, increasing about twice the carrier transfer constant and photocurrent of the heterojunction compared with pristine CsPbBr\({}_{3}\) PNCs. This would be convenient for the future fabrication of photoelectrodes for a solar-driven photo(electro)catalysis. One of the key factors to produce PNCs with high color purity and enhanced PL properties is the use of organic ligands during the material synthesis [8; 21]. These molecules anchor to the nanocrystal surface through the covalent interaction with AX and BX\({}_{2}\) terminals (more often CsX and PbX\({}_{2}\), respectively) [22; 23]. This implies that a fraction of ligands can replace A- and X-sites into the PNCs, filling surface defects and decreasing non-radiative carrier traps [23]. Most of the contributions related to the PNCs synthesis have reported the use of oleic acid (OA) and oleylamine (OLA) as the conventional long-chain ligands, producing oleylammonium oleate (OLM) as the determinant species to promote the surface passivation and stabilization of PNCs [24; 25; 26]. However, (i) the formation of N-oleyloleamide as a byproduct during the OLM formation [7; 27] and (ii) the loss of ligands from the nanocrystal surface in the form of oleylammonium halides reduce the fraction of the protective organic layer covering the PNCs [28]. At this point, a highly defective product is generated, which is more prone to suffer a fast self-degradation and experience the progressive quench of the PL properties [14; 29]. Additionally, an excess of oleylamine can result in further decomposition of the PNCs, while an excess of oleic acid promotes a phase transition in the perovskite from a cubic to a tetragonal phase. This fact generates an imminent PL quenching [30].