Impact of Fullerene on the Photophysics of Ternary Small Molecule Organic Solar Cells
Type
PresentationsAuthors
Karuthedath, Safakath
Firdaus, Yuliar

Liang, Ru-Ze

Gorenflot, Julien

M. Beaujuge, Pierre
D. Anthopoulos, Thomas
Laquai, Frédéric

KAUST Department
King Abdullah University of Science and Technology (KAUST) - Saudi ArabiaPhysical Science and Engineering (PSE) Division
Material Science and Engineering Program
KAUST Solar Center (KSC)
Date
2019-07-18Permanent link to this record
http://hdl.handle.net/10754/676746
Metadata
Show full item recordAbstract
Ternary organic solar cells (OSC) are among the best-performing organic photovoltaic devices to date, largely due to the recent development of non-fullerene acceptors.[1] However, fullerene molecules still play an important role in ternary OSC systems, since, for reasons not well understood, they often improve the device performance, despite their lack of absorption.[2] In this work, we study the photophysics of a prototypical ternary small molecule OSC blend composed of the donor DR3, the non-fullerene acceptor ICC6, and the fullerene derivative PC71BM by ultrafast spectroscopy. Surprisingly, we find that after excitation of PC71BM, ultrafast singlet energy transfer to ICC6 competes efficiently with charge transfer. Subsequently, singlets on ICC6 undergo hole transfer to DR3, resulting in free charge generation. Interestingly, PC71BM improves indirectly the electron mobility of the ternary blend, while electrons reside predominantly in ICC6 domains as indicated by fast spectroscopy. The improved mobility facilitates charge carrier extraction, in turn leading to higher device efficiencies of the ternary compared to binary solar cells. Using the (photo)physical parameters obtained from (transient) spectroscopy and charge transport measurements, we simulate the device’s current-voltage characteristics and demonstrate that the parameters accurately reproduce the experimentally-measured device performanceCitation
KARUTHEDATH, S., Firdaus, Y., Liang, R.-Z., Gorenflot, J., M. Beaujuge, P., D. Anthopoulos, T., & Laquai, F. (2019). Impact of Fullerene on the Photophysics of Ternary Small Molecule Organic Solar Cells. Proceedings of the nanoGe Fall Meeting19. doi:10.29363/nanoge.nfm.2019.108Sponsors
Supported by funding from King Abdullah University of Science and Technology (KAUST).Publisher
Fundació ScitoConference/Event name
Proceedings of nanoGe Fall Meeting19 (NFM19) #OPV19. Organic Photovoltaics: recent breakthroughs, advanced characterization and modellingAdditional Links
https://www.nanoge.org/proceedings/NFM19/5d0f8486c4eeba5c9e2d0768ae974a485f413a2113503eed53cd6c53
10.29363/nanoge.nfm.2019.108