Li, Yuqing; Meng, Huifeng; Huang, Jianhua; Zhan, Chuanlang published the artcile< Analysis of effects of substituent number on device performance through structural cutting of non-fullerene acceptors by chlorination>, Related Products of 118-45-6, the main research area is chlorination organic solar cell crystallinity external quantum efficiency; fullerene-free; halogenation; polymer solar cell; small-molecule acceptor; structural cutting.
Effects of chlorination on photovoltaic performance of organic solar cells are yet largely unclear though it is emerging as a special yet effective strategy to design highly efficient non-fullerene acceptors (NFAs). Herein, a bi-chlorine-substituted NFA with regioregularity, namely, bichlorinated dithienothiophen[3.2-b]- pyrrolobenzothiadiazole (BTP-2Cl-δ), is synthesized and compared to the non-chlorinated BTP and tetra-chlorine-substituted BTP-4Cl to study the effects of Cl number on the photovoltaic performance. From BTP to BTP-2Cl-δ and BTP-4Cl, the three mols. show gradually red-shifted absorption peaks, narrowed band gaps, and lowered highest occupied MOs (HOMOs) and lowest unoccupied MOs (LUMOs). Polymer solar cells are fabricated using PM6 as the donor and the three small mols. as the acceptors. From BTP to BTP-2Cl-δ, efficiencies (8.8 vs 15.4%) are significantly enhanced due to the better film morphol. and strong crystallization of the BTP-2Cl-δ-based device, giving rise to boosted fill factors (FFs) and short-circuit current densities (JSC’s). From BTP-2Cl-δ to BTP-4Cl, although JSC’s (24.3 vs 25.0 mA cm-2) are slightly elevated due to the higher crystallinity of BTP-4Cl, leading to improved exciton dissociation and collection efficiencies, FFs (71.1 vs 68.0%) are obviously decreased owing to the unfavorable film morphol., unbalanced hole-electron mobilities, and higher charge recombination in BTP-4Cl-based devices. As such, the efficiency of the BTP-2Cl-δ-based device (15.4%) is superior to that of the BTP-4Cl-based device (14.5%). This work elucidates a design strategy by cutting the numbers of substituent chlorine to obtain desired energy levels and crystallization with optimal performance.
ACS Applied Materials & Interfaces published new progress about Band gap. 118-45-6 belongs to class chlorides-buliding-blocks, and the molecular formula is C8H3ClO3, Related Products of 118-45-6.
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics