Synthesis of new conjugated small-molecule-dyes based on 2-(2-methyl-4H-chromen-4-ylidene)malononitrile as the electron-withdrawing group and their application in photovoltaic devices

Synthesis, optical and electrochemical properties of a series of push-pull dyes based on the 2-(3-cyano-4,5,5-trimethylfuran-2(5H)-ylidene)malononitrile (TCF) acceptor

“…In recent decades, push-pull dyes have attracted a lot of attention due to their numerous applications ranging from non-linear optics (NLO) [1][2] to organic photovoltaics (OPV), [3][4] organic field effect transistors (OFET), [5] organic light emitting diodes (OLED) [6] and polymerization photoinitiators. [7][8][9][10][11][12] Typically, push-pull dyes are molecules comprising an electron donor and an electron acceptor connected by mean of a π -conjugated and planar system.…”

New push-pull dyes based on 2-(3-oxo-2,3-dihydro-1H-cyclopenta[b]naphthalen-1-ylidene)malononitrile: An amine-directed synthesis

“…During the past decades, a great deal of efforts has been devoted to design push-pull chromophores as these structures can find applications in numerous research fields ranging from Non-Linear Applications (NLO) [1][2][3][4][5][6] to Organic Photovoltaics (OPVs) [7][8][9][10][11][12], Organic Fields Effects Transistors (OFETs) [13], Organic Light-Emitting Diodes (OLEDs) [14] and photoinitiators of polymerization [15][16][17][18][19]. Typically, a push-pull compound is composed of an electron donor connected to an electron acceptor by mean of a conjugated or a non-conjugated spacer but dyes comprising a conjugated spacer are the most popular ones.…”

Molecular Aggregation of Naphthalene Diimide(NDI) Derivatives in Electron Transport Layers of Inverted Perovskite Solar Cells and Their Influence on the Device Performance

“…The selection of NDI moiety as ac ore unit was based on its excellent electron transport performance in the ETL of solar cells reported in recent years. To lift its electron-transport performance, we also introduced 2-(2-methyl-4H-chromen-4-ylidene)malononitrile (CMCN) group.T he choice of CMCN is due to its strong electron-accepting ability throught wo nitrile groups, [54] which is in conjugation with NDI core to increase electron affinity and lower the band gap of the resultant NDI derivatives. These resultant novel NDI derivativesh ave large pconjugation surfacea rea.…”

“…[52,53] Here, we tried to Figure out another simple way,w hich is attaching specific side chains onto the framework of NDI derivatives elaborately to solve this aggregation problem.2 -(2-Methyl-4Hchromen-4-ylidene)malononitrile (CMCN) group was employed as the functional group due to its stronge lectron-accepting property through two nitrile groups. [54] By carefullya djusting the positiona nd the amount of side chains on the framework of NDI derivatives, the extent of molecular interaction anda ggregation in the solid state could be successfully modified in our work. Then, their roles in how to influence the performance of devices have been carefullye xplored.…”