Stable Perovskite Solar Cells Using Molecularly Engineered Functionalized Oligothiophenes as Low-Cost Hole-Transporting Materials

Vellaichamy Joseph, Albertus Adrian Sutanto, Cansu Igci, Olga A. Syzgantseva, Vygintas Jankauskas, Kasparas Rakstys, Valentin I.E. Queloz, Hiroyuki Kanda, Ping Yu Huang, Jen Shyang Ni, Sachin Kinge, Ming Chou Chen, Mohammad Khaja Nazeeruddin

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Triarylamine-substituted bithiophene (BT-4D), terthiophene (TT-4D), and quarterthiophene (QT-4D) small molecules are synthesized and used as low-cost hole-transporting materials (HTMs) for perovskite solar cells (PSCs). The optoelectronic, electrochemical, and thermal properties of the compounds are investigated systematically. The BT-4D, TT-4D, and QT-4D compounds exhibit thermal decomposition temperature over 400 °C. The n-i-p configured perovskite solar cells (PSCs) fabricated with BT-4D as HTM show the maximum power conversion efficiency (PCE) of 19.34% owing to its better hole-extracting properties and film formation compared to TT-4D and QT-4D, which exhibit PCE of 17% and 16%, respectively. Importantly, PSCs using BT-4D demonstrate exceptional stability by retaining 98% of its initial PCE after 1186 h of continuous 1 sun illumination. The remarkable long-term stability and facile synthetic procedure of BT-4D show a great promise for efficient, stable, and low-cost HTMs for PSCs for commercial applications.

Original languageEnglish
Article number2100783
JournalSmall
Volume17
Issue number26
DOIs
StatePublished - 1 Jul 2021

Keywords

  • functionalized oligothiophenes
  • low-cost hole transporting material
  • n-i-p configuration
  • stable perovskite solar cells

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