Multifunctional Perylenediimide-Based Cathode Interfacial Materials for High-Performance Inverted Perovskite Solar Cells
ACS APPLIED ENERGY MATERIALS(2021)
Abstract
Cathode interfacial materials (CIMs) are important to boost the device performance of perovskite solar cells (PVSCs). Herein, we reported two perylenediimide oligomers, PDI-D and PDI-T, which could play the role of an efficient multifunctional cathode interfacial layer (CIL) in the inverted PVSC. With the combinations of good orthogonal solvent solubility, interfacial dipole, self-doping, and interfacial doping in the PDI-T molecule, the contact barrier between the electron-transport layer and the metal cathode is obviously reduced. Adding to the induced good conductivity, the corresponding inverted PVSC with PDI-T as a CIL shows a promising power conversion efficiency (PCE) of 21.06% with simultaneously enhanced open-circuit voltage, current density, and fill factor. Moreover, thickness insensitivity of PDI-T CIL to PCE is also observed. Furthermore, good stability with a PCE loss of only 3.3% after 1032 h is also obtained. As such, it is concluded that the multifunctionalities from a single molecule in the CIM provide a new molecular insight for pursuing high-performance and stable inverted PVSCs.
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Key words
perovskite solar cells,cathode interface materials,perylenediimide oligomer,interfacial doping,interfacial dipole
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