Planar Perovskite Solar Cells with High Open-Circuit Voltage Containing a Supramolecular Iron Complex as Hole Transport Material Dopant

Saygili Y., Turren-Cruz S., Olthof S., Saes B. W. H., Pehlivan I. B., Saliba M., ...Daha Fazla

CHEMPHYSCHEM, cilt.19, sa.11, ss.1363-1370, 2018 (SCI-Expanded, Scopus) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 19 Sayı: 11
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1002/cphc.201800032
  • Dergi Adı: CHEMPHYSCHEM
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1363-1370
  • Anahtar Kelimeler: perovskite solar cells, p-type HTM doping, iron complex dopant, solar energy production, ORGANOMETAL HALIDE PEROVSKITES, PHENANTHROLINE LIGANDS, ORGANIC SEMICONDUCTORS, PHOTOVOLTAIC CELLS, EFFICIENT, STATE, ELECTRON, PERFORMANCE, DEPOSITION, LAYERS
  • Ankara Üniversitesi Adresli: Hayır

Özet

In perovskite solar cells (PSCs), the most commonly used hole transport material (HTM) is spiro-OMeTAD, which is typically doped by metalorganic complexes, for example, based on Co, to improve charge transport properties and thereby enhance the photovoltaic performance of the device. In this study, we report a new hemicage-structured iron complex, 1,3,5-tris(5-methyl-2,2-bipyridin-5-yl)ethylbenzene Fe(III)-tris(bis(trifluoromethylsulfonyl)imide), as a p-type dopant for spiro-OMeTAD. The formal redox potential of this compound was measured as 1.29V vs. the standard hydrogen electrode, which is slightly (20mV) more positive than that of the commercial cobalt dopant FK209. Photoelectron spectroscopy measurements confirm that the iron complex acts as an efficient p-dopant, as evidenced in an increase of the spiro-OMeTAD work function. When fabricating planar PSCs with the HTM spiro-OMeTAD doped by 5mol% of the iron complex, a power conversion efficiency of 19.5% (AM 1.5G, 100mWcm(-2)) is achieved, compared to 19.3% for reference devices with FK209. Open circuit voltages exceeding 1.2V at 1 sun and reaching 1.27V at 3 suns indicate that recombination at the perovskite/HTM interface is low when employing this iron complex. This work contributes to recent endeavors to reduce recombination losses in perovskite solar cells.