Side-chain modification of non-fullerene acceptors for organic solar cells with efficiency over 18%

Abstract

Three non-fullerene acceptors BTP-OC4, BTP-OC6 and BTP-OC8 with different 4-alkyloxyphenyl side-chains were designed and synthesized through a new synthetic route without organotin reagent. The length of the alkyloxy attached on...

High-efficiency organic solar cells enabled by nonfullerene acceptors with varying alkyloxy substitution positions of the phenyl outer side chains

“…The intermediate TPBT-2Br was synthesized according to the procedure reported by us previously without using organotin reagents. 33 1 H NMR, 13 C NMR and high-resolution mass spectrometry were conducted to confirm the molecular structures (ESI†). Both isomeric NFAs demonstrate favorable solubility in typical organic solvents such as chloroform, toluene, and chlorobenzene under ambient conditions, thereby facilitating the effortless production of organic semiconductor devices.…”

Tackling Efficiency Challenges and Exploring Greenhouse-Integrated Organic Photovoltaics

“…Several strategies have been explored for the improvement of stability, including a molecular design and the choice of active materials, device architecture, and encapsulation [45]. In the molecular design of donor and acceptor materials, the sidechain/end-group engineering of donor and/or acceptor materials is performed, which can optimize the stability of the materials and hence the lifetime of the device as well [46,47]. In the device architecture, the inverted device structure is more stable compared to the conventional architecture of the device.…”

Positional effects of alkyl chains on the photovoltaic performances of quinoxaline-based polymers

“…Furthermore, J SC is influenced by the absorption ability of the active layer, exciton dissociation, and charge-collection properties. 30,31 When comparing the extinction coefficients of the polymer donors, as summarized in Table 1, we expected J SC to increase in the order: PBT-uQxCN 4 PBT-dQxCN. The results align perfectly with this speculation, as PBT-uQxCN:Y6 (23.56 mA cm À2 ) exhibited a higher J SC , with an increase of approximately 23% compared to PBT-dQxCN:Y6 (18.17 mA cm À2 ).…”