2022年成果展示

Adv. Mater. 2022, 34, 2200907

Graphical abstract：By coupling with BTP core unit in Y-series molecule, an asymmetric, volatile 1,3-dibromo-5-chlorobenzene solid can induce the anisotropic dipole direction, elevated dipole moment, and interlaminar inter action spontaneously. Consequently, an impressive fill factor of 80.2% with maximum power conversion efficiency (PCE) of 18.5% in the PAS-treated device is achieved. More strikingly, the PAS treated devices demonstrate a promising thickness-tolerance character, where a record PCE of 17.0% is yielded in PAS devices with a 300 nm thickness photoactive layer, which represents the highest PCE for thick-film organic solar cells.

Adv. Mater. 2022, 34, 2105080

Graphical abstract：In this study, integrated CP-TADF and MR-TADF (CPMR-TADF) are prepared by strategic design and synthesis of asymmetrical peripherally locked enantiomers, which are separated and denoted as (P,P″,P″)-/(M,M″,M″)-BN4 and (P,P″,P″)-/ (M,M″,M″)-BN5 and exhibit TADF and circularly polarized light (CPL) properties. Importantly, unambiguous circularly polarized electroluminescence signals with dissymmetry factors (gEL) of +3.7 × 10−3/−3.1 × 10−3 (BN4) and +1.9 × 10−3/−1.6 × 10−3 (BN5) are obtained.

Adv. Mater. 2022, 34, 2107659

Graphical abstract：In this work, two novel structurally similar oligomers (named 5BDTBDD and 5BDDBDT) with D-A-D-A-D and A-D-A-D-A configuration are synthesized for high-performance ternary OSCs with low energy loss. As third components, these PM6 analogue oligomers effectively suppress the non-radiative recombination in OSCs. The ternary devices based on PM6:5BDTBDD:BTPBO4Cl and PM6:5BDDBDT:BTP-BO4Cl achieve a significantly improved PCEs of 17.54% and 17.32%, representing the state-of-the art OSCs processed by green solvent of o-xylene.

Adv. Funct. Mater. 2022, 32, 2113183

Graphical abstract： In this contribution, three molecules, named TTT-TPA-R (R = H, OMe, tBu), using tris(triazolo)triazine (TTT) as the acceptor and triphenylamine derivatives (TPA-R, R = H, OMe, and tBu) as the donor are prepared and characterized. All these emitters show deep/pure blue emission between 420 and 470 nm in the PMMA film, concomitant with the excellent emission efficiency of 80–100%. The solution processable deep blue organic light-emitting diodes (OLEDs) achieve a maximum external quantum efficiency (EQEmax) of 10.5% which is the recorded value for the solution processable deep blue OLED based on the “hot exciton” mechanism. Using TTT-TPA-H as the host material, solution-processed phosphorescent OLED based on PO-01 presents the EQEmax of 20.2%. 

Chemical Engineering Journal 437 (2022) 135182

Graphical abstract：Two novel D-A copolymer donors, namely PBDTTS-2FQx and PBDTTS-2ClQx, comprising an alkylthiothiophene benzodithiophene (BDTTS) as donor unit, alkyl substituted thiophene as the π-bridges and an identical molecular framework but alkoxy substituted fluorobenzene (or chlorobenzene) side chains on the quinoxaline (Qx) as acceptor units, are first developed and compared in parallel. the OSCs based on PBDTTS-2ClQx:BTP-eC9 deliver an impressive power conversion efficiency (PCE) of 16.1% with simultaneously increased fundamental parameters, while the PBDTTS-2FQx-based OSCs exhibits only a PCE of 12.2%. The impressive PCE of 16.1% is by far one of the highest values for binary OSCs with the Qx-based copolymer as donors.

ChemicalEngineeringJournal444(2022)136509

Graphical abstract：In this work, in order to advance photovoltaic properties, a type of non-fused-ring asymmetrical SMAs with an A-D-D’-A framework, named as IOMe-4Cl and IOEH-4Cl, was primarily designed and synthesized with a multifunctional alkoxy indenothiophene (INT) unit assembled with a classic dithienocyclopentadiene (DTC) unit as an electron-donating D-D’ central build. A compelling PCE of 13.67% with high Jsc of 23.00 mA cm2, Voc of 0.85 V and FF of 70.19% was obtained for the PM6:IOEH-4Cl based binary cells.

Chemical Engineering Journal 445 (2022) 136691

Graphical abstract：A simple-structure small-molecule non-fullerene acceptor IDIC-C4Ph with an indaceno[2,1-b:6,5-b’]dithiophene unit (IDT) core was primarily used as a guest acceptor and incorporated into the PM6:Y6 blend to construct ternary PSCs. And an outstanding PCE of 18.10% with simultaneously increased Jsc of 26.65 mA cm2 and FF of 77.85% was achieved in the PM6:Y6:IDIC-C4Ph based PSCs. Importantly, the ternary PSCs exhibited a broad composition tolerance to Y6:IDIC-C4Ph ratios ranging from 1.2:0.10 to 1.2:0.50 with a PCE higher than the PM6:Y6 based PSCs and an improved device stability, in which the PCE value maintained 90% level after 1080 h (45 days) at room temperature.