Additive‐Induced Synergies of Defect Passivation and Energetic Modification toward Highly Efficient Perovskite Solar Cells

Abstract

Defect passivation via additive and energetic modification via interface engineering are two effective strategies for achieving high‐performance perovskite solar cells (PSCs). Here, the synergies of pentafluorophenyl acrylate when used as additive, in which it not only passivates surface defect states but also simultaneously modifies the energetics at the perovskite/Spiro‐OMeTAD interface to promote charge transport, are shown. The additive‐induced synergy effect significantly suppresses both defect‐assisted recombination and interface carrier recombination, resulting in a device efficiency of 22.42% and an open‐circuit voltage of 1.193 V with excellent device stability. The two photovoltaic parameters are among the highest values for polycrystalline CsFormamidinium/Methylammonium (FAMA)/FAMA based n‐i‐p structural PSCs using low‐cost silver electrodes reported to date. The findings provide a promising approach by choosing the dual functional additive to enhance efficiency and stability of PSCs.

Self‐Organized Small Molecules in Robust MOFs for High‐Performance Perovskite Solar Cells with Enhanced Degradation Activation Energy

“…Therefore, the introduction of Zn-TTB could improve the charge carrier transport of perovskite layer more efficiently. [34,35]…”

A multifunctional chemical linker in a buried interface for stable and efficient planar perovskite solar cells

“…[20][21][22] It should be mentioned that the electrostatic potential structure of HMBS is asymmetric both before and after UV irradiation; such an asymmetric electronegative structure will form an electric dipole layer, which is conducive to achieving more effective interface carrier transport. 23,24 The frontier molecular orbitals, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO), of HMBS before and after UV irradiation also show the electron density concentrated on one of the benzene rings and the asymmetrical distribution of the electron cloud will facilitate the charge transfer between HMBS and adjacent materials. 25 Thus, HMBS is an ideal interface material for perovskite solar cells no matter with or without ultraviolet radiation.…”

Screening interface passivation materials intelligently through machine learning for highly efficient perovskite solar cells

“…[13][14][15] The interface material may also modify the energetics at the perovskite/transport layer interface, promoting carrier extraction. 16,17 The performance improvements carried out on more than 200 previously reported highly efficient nip-type PSCs via different passivation strategies are shown in Fig. S1 in the ESI.…”