Achieving efficient and stabilized organic solar cells by precisely controlling the proportion of copolymerized units in electron-rich polymers

Abstract

A series of random polymers based on the donor polymer PM6 were designed from the perspective of regulating the surface electrostatic potential (ESP) distribution of the polymer and applied to...

Intrinsically Stretchable Organic Photovoltaic Thin Films Enabled by Optimized Donor–Acceptor Pairing

“…On the other hand, the inclusion of TOT in POs yields a t index closer to that of PTzBI-Si, as opposed to that of PVs with TVT incorporation. These results demonstrate that the PO/NV combination exhibits a t index similar to that of their parent polymer blend, PTzBI-Si:P­(NDI2OD-T2), implying less adverse effects on electronic structures at various length scales resulting from intrachain modifications. − …”

Stability of organic solar cells: toward commercial applications

“…Notably, the PMZ2:Y6-based device exhibited better thermal stability than the PM6:Y6 system, retaining 79% of its initial PCE after continuous thermal ageing at 85 °C for 66 h. The Chen group reported a series of terpolymers based on BDT and 1,3-bis(thiophen-2-yl)-5,7-bis(2-ethylhexyl)benzo[1,2 -c :4,5 -c ′]dithiophene-4,8-dione (BDD) that achieved variations in the composition ratios of the electron-donating and electron-withdrawing units in the polymer structure. 59 After the introduction of 5% BDT units, the PM6-5%BDT:Y6-based device displayed the best charge transport efficiency and lower charge recombination, resulting in a high PCE of 16.7%. In contrast, the PCE of the devices based on terpolymers was significantly lower at around 13% after the introduction of the BDD unit.…”