A–π–D–π–A based porphyrin for solution processed small molecule bulk heterojunction solar cells

Abstract

In this article, we have designed and synthesized a porphyrin with the following molecular architecture A-π-D-π-A in which ethyl rhodanine end capping groups were linked to the core porphyrin donor via an octyl thiophene-ethynylene π bridge denoted as VC117 and used it as an electron donor along with ([6,6] The higher value of J sc is explained by the increased absorption profile of the blend, the higher incident photon to current efficiency (IPCE) response and the better crystallinity of the active layer when processed with solvent additives and thermal annealing while the enhancement of FF is due to the better charge transport capability and the charge collection efficiency of the latter device.

Conjugated D–A porphyrin dimers for solution-processed bulk-heterojunction organic solar cells

“…Their electrochemical band gaps are 1.60, 1.66, and 1.69 eV, respectively, confirming that conjugated D-A porphyrin dimers lower the band gaps than those of none D-A ones to some extent. 14,29 It is also noted that among all these un-optimized and optimized devices, the (DPP-ZnP-E)2-Ph-based ones show the best PCEs with the highest J SC and FF values, which can be partially ascribed to the best ICT among the three donors drawn from the absorption spectra. The active layers were spin-cast with chlorobenzene (CB) solutions containing the donor and PC 61 BM in the weight ratio of 1 : 1 and 1% pyridine additive, and FNEZnP-OE serves as a cathode interlayer, which we reported previously.…”

Influence of the positions of thiophenes and side chains on diketopyrrolopyrrole based narrow band-gap small molecules for organic solar cells

“…After thermal annealing at 100 C for 10 min, the diffraction peak of DPPTTC6 and DPPTTC8 become stronger while the peak of IDPPTIC8 shows no obvious change. This indicates that the crystallinity of DPPTTC6 and DPPTTC8 are increased by thermal annealing [37]. The increase in the crystallinity leads to an enhancement in the light absorption properties of the active layers and higher hole mobilities in the blend films.…”

Assembly of Covalently Inorganic-Organic Hybrid Molecular Framework Based on Porphyrin and Phthalocyanine Derivatives—Sensitizer for Dye Sensitized Solar Cells

“…Additionally, carboxyls (-COOH) and ester functions (-COOR) connected well with conductive metal oxides on electrode plates for purpose of rapid electron transfer [18]. For enhance electron transfer efficiency, meso-substituted phenylporphyrins were covalently linked in conjugation way to form an A-π-D-π-A (electron acceptor-π bond transfer-porphyrin electron donor -π bond transfer-electron acceptor) system [19]. This photosensitized dye captured light with high performance, and the exited electron can be rapidly transferred by the conjugated system, and therefore it exhibited excellently photovoltaic property.…”

“…Finally, novel dye sensitized solar cells would be designed and assembled with this photo permeable electrodes, and the cells efficiencies would be examined and improved. According to reported method [19], the designed DSSCs' diagram was showed in Figure 3. …”