Propeller-Shaped Acceptors for High-Performance Non-Fullerene Solar Cells: Importance of the Rigidity of Molecular Geometry

Abstract

This paper describes the synthesis and application of βTPB6 and βTPB6-C as electron acceptors for organic solar cells. Compound βTPB6 contains four covalently bonded PDIs with a BDT-Th core at the β-position. The free rotation of PDIs renders βTPB6 with varying molecular geometries. The cyclization of βTPB6 yields βTPB6-C with high rigidity of the molecular geometry and enlarged conjugated skeleton. The inverted solar cells based on βTPB6-C and PTB7-Th as the donor polymer exhibited the highest efficiency of 7.69% with V oc of 0.92 V, J sc of 14.9 mAcm −2 , and FF of 0.56, which is 31% higher than that for βTPB6 based devices. The larger fraction of βTPB6-C and PTB7-Th than that of βTPB6:PTB7-Th in a blend film takes a face-on orientation packing pattern for π-systems that benefits the charge transport and hence higher PCE value than that for βTPB6:PTB7-Th. It was also found that a proper DIO:DPE additive further enhances this trend, which results in an increase of the PCE value for βTPB6-C:PTB7-Th while decreasing the PCE value for βTPB6:PTB7-Th.

Dithieno[3,2‐b:2′,3′‐d]pyrrol Fused Nonfullerene Acceptors Enabling Over 13% Efficiency for Organic Solar Cells

“…[21][22][23][24][25] Indacenodithiophene (IDT) and indacenodithieno [3,2-b]thiophene (IDTT) are most widely employed as the central electron-donating donor, while 3-(dicyanomethylidene)indan-1-one (IC) and its derivatives as the terminal electron-withdrawing acceptor. [21][22][23][24][25] Indacenodithiophene (IDT) and indacenodithieno [3,2-b]thiophene (IDTT) are most widely employed as the central electron-donating donor, while 3-(dicyanomethylidene)indan-1-one (IC) and its derivatives as the terminal electron-withdrawing acceptor.…”

Synthesis and Application of Rylene Imide Dyes as Organic Semiconducting Materials

“…Furthermore, Yu and co-workersd eveloped ap ropeller-shaped PDI derivative 21 by Suzukic ouplinga nd subsequentc yclization. [23] By comparing the photovoltaic performance of 21 with the uncyclized analogue,t hey demonstrated that careful control of the molecular geometry rigidity was an effective strategy to design high-performance organic semiconducting materials.…”

“…Asian J. 2018,13,[20][21][22][23][24][25][26][27][28][29][30] www.chemasianj.org lated PDI dyes via palladium-catalyzed SiÀCb ond formation. [37] Startingf rom 5a, 37 and 38 were obtained in one-pot reactions in high yield using Pd(OAc) 2 as the catalyst, as well as PCy 3 and KOAc as the ligand and base, respectively.T hese dyes exhibited red-shifted absorption and high fluorescence quantum yields.…”

“…Asian J. 2018,13,[20][21][22][23][24][25][26][27][28][29][30] www.chemasianj.org derivative( 55)b yu sing tetraphenyl methane as the central core. [49] The dihedrala ngle resulting from theoretical calculations was 110.178 between phenylg roup and connected PDI subunit and the PCE was 2.73 %f or devices based on 55.…”

“…The commonbuilding blocksfor PDI-based functional molecules.Chem. Asian J 2018,13,[20][21][22][23][24][26][27][28][29][30] www.chemasianj.org…”