Regulating the Interplay at the Buried Interface for Efficient and Stable Carbon-Based CsPbI₂Br Perovskite Solar Cells

Abstract

Buried interface modification is promising for preparing high-performance perovskite solar cells (PSCs) by improving the film quality and adjusting the interfacial energy level alignment. In this work, multifunctional ethylenediaminetetraacetic acid diammonium (EAD)-modulated ZnO is employed as an effective buried interface to regulate the interplay between SnO2 and CsPbI2Br in carbon-based inorganic PSCs (C-IPSCs). The burying of EAD into the ZnO interlayer not only enhances the photoelectric properties of ZnO by passivating oxygen defects but also adjusts the energy level alignment of the buried interface. More importantly, the perovskite quality is optimized and the buried interface defects are passivated due to the formation of coordination and hydrogen bondings. Benefiting from such a robust and efficient charge transfer configuration, a maximum power conversion efficiency of 14.58% is achieved in the optimized device, which represents the highest performance reported among those of low-temperature CsPbI2Br C-IPSCs. In addition, the unencapsulated device demonstrates better long-term and thermal stability.

Targeting the imperfections at the ZnO/CsPbI2Br interface for low-temperature carbon-based perovskite solar cells

“…Therefore, a small amount of dphase has little effect on the E g of CsPbI 2 Br, which is consistent with previous reports. 5,20,[74][75][76][77] In contrast, the perovskite lms on the doped ZnO lms presented a mitigated variation trend in the lm color and absorption spectra under the same conditions, suggesting inhibited moisture-induced phase degradation, as further conrmed by the temporal evolution of XRD patterns (Fig. 6a-d).…”

Modulating Dimensionality of 2D Perovskite Layers for Efficient and Stable 2D/3D Perovskite Photodetectors

“…The crystallinity of the 2D/3D perovskite films was examined through X-ray diffraction (XRD) measurements. As depicted in Figure b, all the films exhibited typical diffraction peaks at 14.4°, 20.7°, and 29.5°, corresponding to the (100), (110), and (200) planes of CsPbI 2 Br, respectively . No significant changes were observed in the XRD patterns after the post-treatment with the BAI/ACN and BAI/IPA solutions, indicating that the 3D to 2D transformation on the surface could hardly affect the crystallinity of 3D perovskite.…”

Environmentally Friendly Perovskite‐Based Photovoltaics and Luminescence: Lead Less or Lead Free

“…With the goal of improving the crystallization process of the perovskite active layer, Huang et al demonstrated the positive role of EACl in regulating this process by introducing it into the Sn-based perovskite layer. [182] Concurrently, Cl À ions from the perovskite crystal lattice primarily distribute on the surface and interfaces of the perovskite, resulting in defect passivation and further resistance to oxidation. A small number of Cl À ions enter the perovskite lattice due to their small size and positive charge, enhancing device performance and achieving a PCE of 12.50%.…”