Synchronously regulating the alkyl side-chain and regioisomer of polymerized small molecule acceptor enabling highly efficient all-polymer solar cells processed with non-halogenated solvent

Random copolymerization strategy for non-halogenated solvent-processed all-polymer solar cells with a high efficiency of over 17%

“…28 Inversely, non-halogenated solvents are relatively eco-friendly but usually poor solvents for conjugated polymers. [29][30][31][32][33] Limited solubility induces inferior solventpolymer affinity, meaning that polymers are prone to interacting with themselves instead of solvent molecules, leading to the formation of aggregates, [34][35][36] which does not promote a small domain size, thereby resulting in an inferior PCE. Thus, it is crucial and imperative to develop high-performance polymer materials with excellent solubility for non-halogenated solvent processible all-PSCs.…”

Rationally regulating the terminal unit and copolymerization spacer of polymerized small-molecule acceptors for all-polymer solar cells with high open-circuit voltage over 1.10 V

“…54,55 Additionally, there have already been reports showing that the isomerization of the terminal unit of SMAs in PSMAs would greatly affect the resulting morphology and charge transport properties of the corresponding all-PSCs, and PSMAs without isomerization on the terminal unit would enable higher photovoltaic performance. 56,57 All these considerations inspired us to develop PSMAs with wide bandgaps by a facile approach via the introduction of a novel isomerization-free terminal group.…”

Regioisomeric Polymer Semiconductors Based on Cyano-Functionalized Dialkoxybithiophenes: Structure–Property Relationship and Photovoltaic Performance

“…With regard to the symmetric BT HH , two aromatic protons showed a single down-shifted peak at 7.79 ppm because both α-protons are next to the highly electron-withdrawing cyano group. We thus predict that the monomer based on BT HH may yield a polymer with higher molecular weight by facilitating its oxidative addition to the active catalytic sites during the Stille coupling process [54]. All the monomers were purified by recrystallization from a solvent mixture of methanol and dichloromethane.…”