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Inorganic lead halide perovskite solar cells have emerged as a promising photovoltaic technology with their immense potential to consistently deliver high power output. This has been attributed to the unique electronic and optical properties of the perovskite and the carrier transport films. As a result, these devices possess power conversion efficiencies that vigorously compete with those of standard silicon solar cells. However, certain challenges prevent the commercialization of this technology. Existing methodologies for fabricating the carrier transport layers result in films with high defect densities that affect the device’s performance. In this work, we report the fabrication of the electron-selective layers for highly efficient perovskite solar cells via chemical bath deposition and sputter deposition. Improved process controls over the chemical bath deposition technique yielded highly efficient devices with a champion power conversion efficiency of 23.8%.