Premium
Fullerene Dimers (C 60 /C 70 ) for Energy Harvesting
Author(s) -
Delgado Juan L.,
Espíldora Eva,
Liedtke Moritz,
Sperlich Andreas,
Rauh Daniel,
Baumann Andreas,
Deibel Carsten,
Dyakonov Vladimir,
Martín Nazario
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200902039
Subject(s) - fullerene , acceptor , polaron , photoluminescence , materials science , photochemistry , quantum yield , absorption (acoustics) , absorption spectroscopy , electron acceptor , electron paramagnetic resonance , heterojunction , spectroscopy , chemistry , electron , fluorescence , optoelectronics , nuclear magnetic resonance , organic chemistry , physics , quantum mechanics , composite material , condensed matter physics
A new family of fullerene‐based compounds, namely, soluble [60]‐ and [70]fullerene homodimers and the [60]/[70]heterodimer linked through 2‐pyrazolino–pyrrolidino bridges, has been synthesised by simple procedures and in high yield. Electrochemical studies confirm their suitability to act as electron acceptors in combination with poly(3‐hexylthiophene‐2,5‐diyl) (P3HT). Their optical properties in solution and in the solid state were studied. A significantly stronger absorption in [70]fullerene‐containing dimers relative to [60]homodimer in solution in the visible range was observed. Furthermore, in all donor–acceptor blends studied an efficient charge transfer was observed by means of photoluminescence (PL), photoinduced absorption and light‐induced electron spin resonance spectroscopy. The [70]homodimer was found to be a distinctive species, being the strongest PL quencher and most efficient acceptor with the longest lifetime of the charge‐separated (polaron) states. As a consequence, bulk‐heterojunction solar cells based on this novel [70]homodimer blended with P3HT demonstrated the highest quantum and power conversion efficiencies of 37 and 1 %, respectively, compared to those of [60]fullerene dimers.