Polycyclic Arenes Dihydrodinaphthopentacene‐based Hole‐Transporting Materials for Perovskite Solar Cells Application

Abstract

In this paper, two D-π-D type compounds, C1 and C2, containing dihydrodinaphthopentacene (DHDNP) as a πbridge, p-methoxydiphenylamine and p-methoxytriphenylamine groups as the donor groups were synthesized. The four 4-hexylphenyl groups at the sp 3 -carbon bridges of DHDNP were acquainted with control morphology and improving solubility. The light absorption, energy level, thermal properties, and application as hole-transporting materials in perovskite solar cells of these compounds were fully investigated. The HOMO/LUMO levels and energy gaps of these DHDNP-based molecules are suitable for use as hole-transporting materials in PSCs. The best power conversion efficiencies of the PVSCs based on the C1 and C2 are 15.96% and 12.86%, respectively. The performance of C1 is comparable to that of the reference compound spiro-OMeTAD (16.38%). Compared with spiro-OMeTAD, the C1-based PVSC device showed good stability, which was slightly decreased to 98.68% of its initial efficiency after 48 h and retained 81% of its original PCE after 334 h without encapsulation. These results reveal the potential usefulness of the DHDNP building block for further development of economical and highly efficient HTMs for PVSCs.

Enhancing Efficiency and Stability in Perovskite Solar Cells Through Blended Hole Transporting Materials Incorporating Benzo[g]quinoxaline-Conjugated Small Molecules

“…Small molecules with the D–A–D molecular configuration with the electron-deficient fragment as the central core, such as thienopyrazine, benzothiadiazole, dithienophenazine, and thiazolo­[5,4- d ]­thiazole, have been used in PSC devices. The electron-deficient conjugated core possesses a rigid planar structure and features heteroatoms such as N, O, and S. Our recent research work , and various literature reports − have confirmed that rigid planar conjugated structure is beneficial for π–π stacking, thereby enhancing hole mobility. Moreover, construction units containing heteroatoms, such as N, O, and S, contribute to the passivation of the perovskite surface.…”