Wei-Hao ChiuAcademic Profile

International Journal Publication

Fluorination of Star-Shaped Cyclopenta[2,1-b;3,4-b′]dithiophene Derivatives and Its Application as Hole-Transporting Materials in Scalable Perovskite Solar Cell Fabrication by Bar Coating

Author affiliations and roles
  1. aDepartment of Chemistry, Soochow University, Taipei 11102, Taiwan
  2. bInstitute of Chemistry, Academia Sinica, Taipei 115024, Taiwan
  3. cDepartment of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan
  4. dDivision of Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Linkou Taoyuan 33305, Taiwan
  5. eCenter for Sustainability and Energy Technologies, Chang Gung University, Taoyuan 33302, Taiwan
  6. fCollege of Environment and Resources, Ming Chi University of Technology, New Taipei City 24301, Taiwan
  7. gDepartment of Applied Materials Science and Technology, Minghsin University of Science and Technology, Hsinchu 30401, Taiwan
  8. hDepartment of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
  9. iNational Synchrotron Radiation Research Center, Hsinchu 300092, Taiwan
  10. jDepartment of Chemistry, National Central University, Taoyuan 32001, Taiwan

Solar RRL, 8, 2300988 (2024).

Research topic: Hole-Transporting Materials

Abstract

In this study, three novel star-shaped small molecules HYC-oF, HYC-mF, and HYC-H are designed and synthesized and are applied in perovskite solar cells (PSCs) as efficient hole-transporting materials (HTMs). Compared with non-fluorinated HYC-H, F-substituted analogs HYC-oF and HYC-mF exhibited enhanced hole mobility, suitable energy level alignment, improved interfacial contact and hole extraction/transport capability, better passivation effect, as well as increased hydrophobicity. PSC fabrication by spin-coating this series of HYC-oF, HYC-mF, and HYC-H molecules on a bar-coated perovskite layer yielded PCEs values of 19.64%, 18.38%, and 16.98%, respectively. In order to realize a fully scalable PSC preparation process, sequential coating of HYC-oF layer on perovskite layer all by thermal-assisted bar-coating (TABC) method was carried out on 10 x 10 cm(2) area. The TABC-based HYC-oF layer had a compact and uniform morphology with full surface coverage on the TABC-based perovskite film. Under optimized condition, the PSCs fabricated from such film exhibited a PCE of 18.49% as compared with a lower power conversion efficiency (PCE) of 17.51% from the reference cell using TABC-based spiro-OMeTAD. This work demonstrates the potential of fluorinated star-shaped cyclopenta[2,1-b;3,4-b ']dithiophene (CPDT)-based molecule as HTM for achieving efficient PSC in both small and large scale.

Keywords

bar coatingcyclopenta[2,1-b3,4-b']dithiophenehole-transporting materialsperovskite solar cell
DOI ↗10 Google Scholar citations ↗11 OpenAlex citations ↗FWCI 1.14Top 26.1% normalized citations11 Crossref citations ↗4 Mendeley readers ↗

OpenAlex citation history

Citations by year

11 assigned citations
  1. 12024
  2. 72025
  3. 32026
Source: OpenAlex · Last updated 2026-10-26. Zero-citation years are included.
View citation counts as a table
YearCitations
20241
20257
20263

OpenAlex citing works

Articles citing this work

11 citing articles with DOI, from 11 records indexed by OpenAlex.

  1. Asymmetric Fluorinated Spiro Hole‐Transport Materials Enabled by a Rapid Core‐Forming Strategy for Blade‐Coated Perovskite Solar Cells ↗

    Advanced Science · pp. e77623, 2026

    DOI: 10.1002/advs.77623

  2. Reducing Interface Energy Loss of Perovskite Solar Cells by Molecular Engineering of Hole‐Transporting Materials ↗

    Angewandte Chemie · vol. 138, no. 13, 2026

    DOI: 10.1002/ange.202523799

  3. Reducing Interface Energy Loss of Perovskite Solar Cells by Molecular Engineering of Hole‐Transporting Materials ↗

    Angewandte Chemie International Edition · vol. 65, no. 13, pp. e23799, 2026

    DOI: 10.1002/anie.202523799

  4. Heteroatom engineering of ortho -fluorinated triarylamine based hole transport materials for enhanced performance in perovskite solar cells ↗

    Journal of Materials Chemistry A · vol. 14, no. 11, pp. 6470-6478, 2025

    DOI: 10.1039/d5ta07841e

  5. Impact of fluorine substitution position on triarylamine-based hole transport materials in perovskite solar cells ↗

    Physical Chemistry Chemical Physics · vol. 28, no. 3, pp. 2072-2080, 2025

    DOI: 10.1039/d5cp04078g

  6. Methoxy‐substituted triphenylamines served as a core to design innovative, cost‐effective hole transport materials essential for the development of efficient perovskite solar cells ↗

    Journal of the Chinese Chemical Society · vol. 73, no. 1, pp. 37-54, 2025

    DOI: 10.1002/jccs.70120

  7. Fused Dithienoheterocycle‐Based Hole‐Transporting Materials for Efficient Perovskite Solar Cells ↗

    Chemistry - An Asian Journal · vol. 21, no. 1, pp. e70245, 2025

    DOI: 10.1002/asia.70245

  8. Noncovalent Conformational Dopant‐Free Hole Transport Materials with Multisite Passivation for Stable n‐i‐p Perovskite Solar Cells ↗

    Small · vol. 21, no. 36, pp. e2505961, 2025

    DOI: 10.1002/smll.202505961

  9. Asymmetric Fluorinated Cyclopenta[2,1‐b:3,4‐b']Dithiophene‐Based Hole‐Transporting Materials for Perovskite Solar Cell ↗

    Chemistry - An Asian Journal · vol. 20, no. 17, pp. e00719, 2025

    DOI: 10.1002/asia.202500719

  10. Effect of ortho -fluorine substituted hole transport materials for perovskite solar cells: influence of rigid vs. flexible linkers ↗

    Journal of Materials Chemistry C · vol. 13, no. 29, pp. 15082-15090, 2025

    DOI: 10.1039/d5tc01565k

  11. Judicious Molecular Design of 5H‑Dithieno[3,2‑b:2′,3′‑d]Pyran‐based Hole‐Transporting Materials for Highly Efficient and Stable Perovskite Solar Cells ↗

    Advanced Science · vol. 12, no. 3, pp. e2410666, 2024

    DOI: 10.1002/advs.202410666

← Return to publications