Doped but Stable: Spirobisacridine Hole Transporting Materials for Hysteresis-Free and Stable Perovskite Solar Cells

Nikita Drigo, Cristina Roldan-Carmona, Marius Franckevičius, Kun Han Lin, Rokas Gegevičius, Hobeom Kim, Pascal A. Schouwink, Albertus A. Sutanto, Selina Olthof, Muhammad Sohail, Klaus Meerholz, Vidmantas Gulbinas, Clémence Corminboeuf, Sanghyun Paek, Mohammad Khaja Nazeeruddin

Research output: Contribution to journalArticle


Four spirobisacridine (SBA) hole-transporting materials were synthesized and employed in perovskite solar cells (PSCs). The molecules bear electronically inert alkyl chains of different length and bulkiness, attached to in-plane N atoms of nearly orthogonal spiro-connected acridines. Di-p-methoxyphenylamine (DMPA) substituents tailored to the central SBA-platform define electronic properties of the materials mimicking the structure of the benchmark 2,2′,7,7′-tetrakis(N,N-di-4-methoxyphenylamino)-9,9′-spirobifluorene (spiro-MeOTAD), while the alkyl pending groups affect molecular packing in thin films and affect the long-term performance of PSCs. Devices with SBA-based hole transporting layers (HTL) attain efficiencies on par with spiro-MeOTAD. More importantly, solar cells with the new HTMs are hysteresis-free and demonstrate good operational stability, despite being doped as spiro-MeOTAD. The best performing MeSBA-DMPA retained 88% of the initial efficiency after a 1000 h aging test under constant illumination. The results clearly demonstrate that SBA-based compounds are potent candidates for a design of new HTMs for PSCs with improved longevity.

Original languageEnglish
Pages (from-to)1792-1800
Number of pages9
JournalJournal of the American Chemical Society
Issue number4
Publication statusPublished - 29 Jan 2020


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Drigo, N., Roldan-Carmona, C., Franckevičius, M., Lin, K. H., Gegevičius, R., Kim, H., Schouwink, P. A., Sutanto, A. A., Olthof, S., Sohail, M., Meerholz, K., Gulbinas, V., Corminboeuf, C., Paek, S., & Nazeeruddin, M. K. (2020). Doped but Stable: Spirobisacridine Hole Transporting Materials for Hysteresis-Free and Stable Perovskite Solar Cells. Journal of the American Chemical Society, 142(4), 1792-1800.