The objective of the project is to optimize ultrathin films of a-SiCx:H for their application in trans parent solar cells. It focues on investigating the correlation between carbon content and bandgap in a-SiCx:H films. The analysis involved studying the optical properties and composition of var ious samples. The films were prepared using the PECVD technique, and their reflectance and transmittance were measured using a double-beam spectrophotometer. To ensure greater precision, absorbance was also measured using the PDS technique. Additionally, the actual concentration of each sample was determined using XPS measurements. 2022/2023