## 1 Introduction
Then, electron-beam-excited plasma deposition used C\({}_{60}\) fullerene clusters as a carbon source for depositing amorphous carbon films. This method allows the deposition of films withcontrolled properties, such as hardness and lubricity [28]. Additionally, vapor deposition without plasma treatment shows a crystalline structure of C\({}_{60}\) film that involves plasma and reveals an amorphous microstructure. In contrast, the laser evaporation of graphite was used by [PERSON] et al. to produce C\({}_{60}\) fullerenes (named Buckminsterfullerene) [29]. The C\({}_{60}\)-modified electrodes, mostly used in biosensors, have been prepared using dropping, vapor deposition, electrochemical deposition, and electropolymerization processes [30]. Among the inexpensive methods for organic-based devices, spin coating is a solution-processing technique. It is also used during the fabrication of OPV and OTFT devices when C\({}_{60}\) is involved [31; 32]. Ultrasonic chemical bath deposition (UCBD) can also be a good alternative technique for uniform and well-characterized thin film. The solution approach is better suited to prepare polymer films since polymer molecular chains tend to break at high temperatures [33]. To enhance the homogeneity and quality of thin film growth, research has investigated the combination of an ultrasonic bath and thin film deposition techniques [34; 32; 33; 35]. The uniformity of the deposed thin layer can be enhanced by ultrasonic agitation in the bath, which minimizes the effects of convection and gravity, resulting in more consistent film thickness and morphology. By improving the mass transport of precursors and reactants to the substrate, its energy can increase the processing speed and rate of deposition. Additionally, a more consistent and regulated environment for film growth can be produced by decreasing defects like pinholes, cracks, and heterogeneities and improving the film's adhesion to the substrate, both of which will enhance the film's quality. The possibility to obtain a functionalized C\({}_{60}\) fullerene is high due to its unique and versatile structure, which has proven to be the ideal foundation for impressive structural diversity, driving significant advancements in the field of organic chemistry and opening new possibilities in the synthesis of advanced compounds. Functionalization in the perspective of C\({}_{60}\) fullerene refers to the process of attaching functional groups or molecules to the surface of the fullerene [36; 37; 38]. Functionalization can significantly enhance the electrical properties of fullerenes. For instance, chemical functionalization of fullerenes can increase their miscibility with host polymers, even if the fullerenes can sometimes lose certain original properties. The functionalization can improve the dispersion of C\({}_{60}\) within the host matrix and enhance their interfacial adhesion, which in turn improves the electrical conductivity of the composite [39]. Once the films are deposed, different characterization methods are required to examine the crystallization of the structure, its morphology, and the chemical elements contained therein. X-ray diffraction, which shows distinctive diffracted peaks corresponding to various reflection planes, is used to examine the crystallite size, crystal structure, and phase present in the synthesized samples of nanocrystals. Also, since no crystal is perfect because of its size, if a crystal extends in all directions, it is an ideal crystal and starting from optimum crystallinity is represented by the broadening of the XRD peak. The size constriction and line cause the intrinsic strain. Size confinement, line dislocations, stacking faults, and sintering stress are the causes of the intrinsic strain [40; 41; 42; 43]. Different synthesis factors affect the structural characteristics and microstructural parameters [41]. Peak broadening in XRD is caused by two factors: lattice strain and crystallite size.