Tetrathienopyrrole-based hole-transporting materials for highly efficient and robust perovskite solar cells

Zhihui Wang, Suhao Yan, Zongyuan Yang, Yujie Zou, Jin Chen, Chunchen Xu, Ping Mao, Shijie Ding, Jing Chen, Xueping Zong, Tianshi Qin, Mao Liang

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Developing coplanar π-extended backbone is essential for simultaneously achieving high hole transport capability and thermal stability for hole-transporting material (HTMs). In this work, the large coplanar tetrathienopyrrole (TTTP) building block is employed to construct two novel linear organic HTMs (WH01 and WH02). With respect to the dithieno[3,2-b:2′,3′-d]pyrrole core, the extended π-conjugation of the TTTP endows low-lying HOMO energy levels, improved interfacial contact and defect passivation, as well as enhanced hole extraction/transport capacity for TTTP-based HTMs. As a result, the TTTP core shows good compatibility to either planar or twisted donor. Perovskite solar cells (PSCs) based on both WH01 and WH02 realize power conversion efficiencies (PCEs) of around 21%. The optimized PSCs adopting WH01 exhibit a champion PCE of 21.54%, which significantly outperforms the reference M130 (18.85%). Furthermore, the un-encapsulated devices with TTTP-series HTMs demonstrate excellent operational stability under ambient air. This systematic study highlights that TTTP-based molecules are promising potential candidates as HTMs for achieving highly efficient and stable PSCs.

Original languageEnglish
Article number138189
JournalChemical Engineering Journal
Volume450
DOIs
StatePublished - 15 Dec 2022

Keywords

  • Hole-transporting materials
  • Perovskite solar cells
  • Photovoltaic performance
  • Tetrathienopyrrole

Fingerprint

Dive into the research topics of 'Tetrathienopyrrole-based hole-transporting materials for highly efficient and robust perovskite solar cells'. Together they form a unique fingerprint.

Cite this