am6b15707_si_001.pdf (2.51 MB)
Excellent Long-Term Stability of Power Conversion Efficiency in Non-Fullerene-Based Polymer Solar Cells Bearing Tricyanovinylene-Functionalized n‑Type Small Molecules
journal contribution
posted on 2017-02-24, 00:00 authored by Eun Yi Ko, Gi Eun Park, Ji Hyung Lee, Hyung Jong Kim, Dae Hee Lee, Hyungju Ahn, Mohammad Afsar Uddin, Han Young Woo, Min Ju Cho, Dong Hoon ChoiNew
small molecules having modified acceptor strength and π-conjugation
length and containing dicyanovinylene (DCV) and tricyanovinylene (TCV)
as a strongly electron-accepting unit with indacenodithiophene, IDT(DCV)2, IDT(TCV)2, and IDTT(TCV)2, were synthesized
and studied in terms of their applicability to polymer solar cells
with PTB7-Th as an electron-donating polymer. Intriguingly, the blended
films containing IDT(TCV)2 and IDTT(TCV)2 exhibited
superior shelf life stabilities of more than 1000 h without any reduction
in the initial power conversion efficiency. The low-lying lowest unoccupied
molecular orbital energy levels and robust internal morphologies of
small TCV-containing molecules could afford excellent shelf life stability.
