Eu‐Based Porphyrin MOF Enables High‐Performance Carbon‐Based Perovskite Solar Cells

Abstract

The low power conversion efficiency (PCE) of hole transport materials (HTM) – free carbon‐based perovskite solar cells (C‐PSCs) poses a challenge. Here, a novel 2D Eu‐TCPP MOF (TCPP; [tetrakis (4‐carboxyphenyl) porphyrin]) sandwiched between the perovskite layer and the carbon electrode is used to realize an effective and stable HTM‐free C‐PSCs. Relying on the synergistic effect of both the metal‐free TCPP ligand with a unique absorption spectrum and hydrophobicity and the EuO4(OH)2 chain in the Eu‐TCPP MOF, defects are remarkably suppressed and light‐harvesting capability is significantly boosted. Energy band alignment is achieved after Eu‐TCPP MOF treatment, promoting hole collection. Förster resonance energy transfer results in improved light utilization and protects the perovskite from decomposition. As a result, the HTM‐free C‐PSCs with Eu‐TCPP MOF reach a champion PCE of 18.13%. In addition, the unencapsulated device demonstrates outstanding thermal stability and UV resistance and keeps 80.6% of its initial PCE after 5500 h in a high‐humidity environment (65%–85% RH).

In situ generated dimethylamine constructs a robust hydrogen-bonded organic framework for selective fluorescence detection

“…37 Porphyrin, a type of porphin derivative with a large conjugated structure, is an excellent building block for HOF design and synthesis due to its rigid structure, tunable external substituents, and metallized ring center. 38–40 In particular, porphyrin molecules containing carboxyl groups have been extensively explored in the construction of various HOF structures based on tetrakis (4-carboxyphenyl) porphyrin (TCPP), 41 while research on dicarboxylphenyl porphyrin (DBP) remains scarce. Only a few metal–organic framework structures incorporating DBP ligands have been reported, such as alkaline earth metal-DBP-MOFs reported by Jiang et al , 3 DBP-UiO reported by Lin et al , 42–44 and Zn-DBP reported by Ma et al 45 DBP ligands are only supported on graphene, titanium dioxide, and other materials applied to catalysis that do not involve the single crystal structure of DBP.…”

Facile Tailoring of Metal‐Organic Frameworks for Förster Resonance Energy Transfer‐Driven Enhancement in Perovskite Photovoltaics

“…Instead, it involves a non‐resonant excitation energy transfer, implying strong electron–phonon coupling of the carriers constituting the exciton, as opposed to the dipole‐dipole coupling in FRET processes. Chen et al [ 16 ] highlighted the absorption spectrum of perovskites overlaps with the PL spectrum of Eu‐TCPP MOF, suggesting the possibility of FRET between Eu‐TCPP MOF and perovskite layers. Similarly, Tan et al [ 17 ] underscored that MOFs serve as excellent platforms for triggering FRET mechanisms.…”