Isomeric acceptors incorporation enables 18.1% efficiency ternary organic solar cells with reduced trap-assisted charge recombination

Regulating the reorganization energy and crystal packing of small-molecule donors enables the high performance of binary all-small-molecule organic solar cells with a slow film growth rate

“…2g, with the optimization of molecules from the terminal group to side chain, the n values become gradually closer to 1 and decline from 1.54 to 1.09 to 1.02, indicating that the T25 -based device suffers the most serious trap-assisted recombination among the three systems, while the blend of T27 : Y6 shows the least amount of recombination, which is in line with the reinforced photovoltaic efficiencies. 50,51 Furthermore, TPV (transient photovoltage) and TPC (transient photocurrent) are determined to gain in-depth insights into the charge recombination and extraction behaviors. TPC measurements primarily reflect the competition between carrier sweep-out and recombination.…”

Trap suppression in ordered organic photovoltaic heterojunctions

“…The PM6:IUIC-mid based OSC exhibited a higher PCE than PM6:IUIC-in and PM6:IUIC-out based ones. Besides, other strategies, such as fluorination, 49 isomerization, 50 etc. were also employed to improve the crystallinity of organic photovoltaic materials and suppress the trap density in devices to boost PCEs.…”

Conjugated polymers and small molecules containing the thiophene–vinylene–thiophene (TVT) unit for organic photovoltaic applications

“…In addition, the ternary strategy has been considered as an efficient method to enhance the device performance through different mechanisms such as charge transfer, energy transfer, parallel linkage, or alloy model. 122–126 Although only one study about TVT -based ternary devices has been reported, the improved PCE indicates that the ternary strategy is applicable to TVT -based devices.…”