Flexible organic photovoltaics with star‐shaped non‐fullerene acceptors end‐capped with indene malononitrile and barbiturate derivatives
Al-Anesi, B; Revoju, S; Hiltunen, A; Suhonen, Riikka; Kraft, TM; Liu, MN; Zhang, HC; Deng, ZF; Fedele, C; Berdin, A; Lamminen, N; Grandhi, GK; Ylikunnari, M; Vivo, P (2022-08)
Al-Anesi, B
Revoju, S
Hiltunen, A
Suhonen, Riikka
Kraft, TM
Liu, MN
Zhang, HC
Deng, ZF
Fedele, C
Berdin, A
Lamminen, N
Grandhi, GK
Ylikunnari, M
Vivo, P
08 / 2022
2200264
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202208306821
https://urn.fi/URN:NBN:fi:tuni-202208306821
Kuvaus
Peer reviewed
Tiivistelmä
We report the design and synthesis of three star-shaped non-fullerene (NFA) acceptors, TPA-2T-INCN, TPA-2T-BAB, and TPA-T-INCN, based on triphenylamine (TPA) core and linked through π-conjugated thiophene (T) spacers to different terminal units (3-oxo-2,3-dihydro-1H-inden-1-ylidene) malononitrile, INCN, and 1,3-dimethylbarbituric acid, BAB). These materials were blended with the widely used poly(3-hexylthiophene-2,5-diyl) (P3HT) donor polymer and tested in flexible organic photovoltaics (OPVs). The NFAs capped with the strong electron withdrawing INCN unit performed best in OPVs. Both P3HT:TPA-T-INCN, and P3HT:TPA-2T-INCN blends also showed the highest photoluminescence quenching efficiency (95.8% and 92.6%, respectively). Surprisingly, when reducing the number of T spacers from 2 to 1, the solubility of the NFAs in o-dichlorobenzene increased, leading to easier processing during the OPV fabrication and better surface morphology. This explains the best performance of TPA-T-INCN-based blends in OPVs, with a champion power conversion efficiency of 1.13%.
Kokoelmat
- TUNICRIS-julkaisut [16944]