Wei-Hao ChiuAcademic Profile

International Journal Publication

Fluorinated Pentafulvalene‐Fused Hole‐Transporting Material Enhances the Performance of Perovskite Solar Cells with Efficiency Exceeding 23%

Author affiliations and roles
  1. aCenter for Green Technology Chang Gung University Taoyuan 33302 Taiwan
  2. bDepartment of Chemical and Materials Engineering Chang Gung University Taoyuan 33302 Taiwan
  3. cDivision of Neonatology Department of Pediatrics Chang Gung Memorial Hospital Linkou Taoyuan 33305 Taiwan
  4. dChang Gung University of Science and Technology
  5. eDepartment of Chemistry Soochow University Taipei 11102 Taiwan
  6. fDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 P. R. China
  7. gInstitute of Chemistry Academia Sinica Taipei 115024 Taiwan
  8. hDepartment of Applied Materials Science and Technology Minghsin University of Science and Technology Hsinchu 30401 Taiwan

Advanced Functional Materials, 33, 2306367 (2023).

Research topic: Hole-Transporting Materials

Abstract

Organic small molecular materials with coplanar & pi;-conjugated system as HTMs in perovskite solar cells (PSCs) have attracted considerable attention due to their high charge transport capability and thermal stability. Herein, three novel pentafulvalene-fused derivatives with or without fluorine atoms incorporated (YSH-oF and YSH-mF and YSH-H, respectively) are designed, synthesized, and applied as hole-transporting materials (HTMs) in PSCs fabrication. The fluorinated HTMs, YSH-oF and YSH-mF, exhibited higher hole mobility and better charge extraction at the perovskite/HTM interface than non-fluorinated one do, presumably due to the closer intermolecular & pi;-& pi; packing interactions. As a result, small-area (0.09 cm(2)) PSCs made with YSH-oF and YSH-mF achieved an impressive power conversion efficiency (PCE) of 23.59% and 22.76% respectively, with negligible hysteresis, in contrast with the 20.57% for the YSH-H-based devices. Furthermore, for large-area (1.00 cm(2)) devices, the PSCs employing YSH-oF exhibited a PCE of 21.92%. Moreover, excellent long-term device stability is demonstrated for PSCs with F-substituted HTMs (YSH-oF and YSH-mF), presumably due to the higher hydrophobicity. This study shows the great potential of fluorinated pentafulvalene-fused materials as low-cost HTM for efficient and stable PSCs.

Keywords

fluorine-substituted small moleculeshole-transporting materialslong-term stabilitypentafulvalene-fused derivativesperovskite solar cells
DOI ↗39 Google Scholar citations ↗38 OpenAlex citations ↗FWCI 3.14Top 7.3% normalized citations36 Crossref citations ↗21 Mendeley readers ↗

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