Abstract <p>The high-temperature superconducting material Bi₂Sr₂CaCuO₈, (Bi-2212) holds major potential for advanced electronic and superconducting technological applications. The present study investigates the complete set of structural, electronic, and magnetic characteristics in Bi-2212 while focusing on interface and heterostructure features with Oxygen doping. The dominance of Cu orbital in the undoped system has been observed over the other orbitals. However, the oxygen contribution variation has been observed in the doped system with a tetragonal structure. Higher magnetic moments in the doped system resulted in the spin density modulation. The stripe order phases of Bi-2212 exhibit different local magnetic moments for Cu sites with a magnitude of ±0.58 μ_B alternating in the upper and lower layers. The decrease in Cu occupancy is due to the hole buildup. The band structure shows a maximum near <i>k</i> ≈ 0.2 and a minimum around <i>k</i> ≈ 0.8, indicating the electronic states’ energy variations. The local Cu–O bond length changed due to planar oxygen position alterations along the α\alpha-axis. The role of different kinds of defects in the doped system is well analyzed. The presence of oxygen interstitials enhances the critical temperature and improves conductivity by adding more carriers to the material. The Bi-2212/Bi₃Se₃ exhibits the highest <i>T</i>_c, showing exceptionally strong effects through their critical temperature (96 K), resulting in a high electrical conductivity (5900 S/cm). The optical conductivity maintains a gradual upward trend, as it implies that improved carrier response occurs at elevated frequencies. Interactions between heterojunction materials lead to advancements that allow better superconducting electronics, quantum devices, and energy-efficient technologies.</p>