Star-shaped benzotriindole-based donor-acceptor molecules: Synthesis, properties and application in bulk heterojunction and single-material organic solar cells

Luminescence of Agrotextiles Based on Red-Light-Emitting Organic Luminophore and Polypropylene Spunbond Enhances the Growth and Photosynthesis of Vegetable Plants

“…As seen from the UV–VIS absorption and luminescence spectra, the shape of the absorption spectra for LUM and ABS is very close to each other. The both compounds have several bands of different intensity in UV spectral region, which can be ascribed to π-π* transitions and the intensive band in blue-green spectral region usually ascribed in such donor-acceptor molecules to the intermolecular charge transfer ( Balakirev et al, 2020 ; Luponosov et al, 2020 ). In PLA matrix, the LUM shows intensive luminescence in the 600–720 nm range with the maximum at 660 nm and a high PLQY (40 ± 5%).…”

“…In this regard, significant advances may be achieved by the further development of PLs with emission in the red region and excitation in the yellow–green spectral region, which is characterized by a lower photosynthesis intensity compared with the region of red light in the action spectrum of photosynthesis ( McCree, 1972 ). PLs based on organic conjugated donor–acceptor molecules with triphenylamine fragments are one of the most promising classes of luminophores for this purpose ( Balakirev et al, 2020 ; Luponosov et al, 2020 ). In this case, it is important to estimate the influence of changes in the light spectral composition on photosynthesis at both the primary light and secondary dark stages.…”

Pixelated full-colour small molecule semiconductor devices towards artificial retinas

“…A further decrease in the LUMO value was achieved by replacing cyanoacetate electronwithdrawing groups with the stronger dicyanovinyl ones. 44 Replacement of a monothiophene p-spacer with a bithiophene one led to an increase of the HOMO value and an even greater decrease of the band gap value, thus making the absorption spectrum of N(Ph-2T-DCV-Hex) 3 similar to that of the green cones. To match the absorption spectrum of the red cones, the triphenylamine block was linked with a combination of two electron-withdrawing blocks based on 2,1,3-benzothiadiazole and N-ethylrhodanine.…”

Branched Electron-Donor Core Effect in D-π-A Star-Shaped Small Molecules on Their Properties and Performance in Single-Component and Bulk-Heterojunction Organic Solar Cells †

“…This work reports on the comprehensive investigation of six star-shaped D-A molecules having electron-withdrawing terminal hexyldicyanovinyl fragments linked through the 2,2 -bithiophene π-spacer to the different branching cores: triphenylamine (TPA) [56], tris(2-methoxyphenyl)amine (m-TPA), 4,4,8,8,12,12-hexakis(4-methylphenyl)-4H,8H,12Hbenzo [1,9]quinolizino [3,4,5,6,7-defg]acridine (f-TPA), 9-phenyl-9H-carbazole (s-CBZ), 2,7dibromo-9-(4-bromophenyl)-9H-carbazole (t-CBZ) [35] or 5,10,15-triethyl-10,15-dihydro-5H-diindolo[3,2-a:3 ,2 -c]carbazole (BTI) [57] (Figure 1). The comparison of their properties and photovoltaic devices performance allows the impact of the donor branching core type on the solubility, phase behavior, optical, electrochemical properties and photoelectric characteristics of SC and BHJ OSCs to be revealed.…”

“…Figure 8 compares J-V curves and EQE spectra of bulk-heterojunction solar cells based on blends with PC 71 BM, and their photovoltaic properties are summarized in Table6(averaged photovoltaic parameters are presented in SI, TableS2). For a correct comparison we fabricated solar cells based on all blends with donor:acceptor mass ratio of 1:2 (as the optimal mass ratio for TPA:PC 71 BM and BTI:PC 71 BM was found to be 1:2[56]). By using thermal annealing for the blends based on f-TPA, t-CBZ and BTI, which are able to crystallize according to the DSC data, we managed to slightly increase PCE within 10%.…”