Details

Autor(en) / Beteiligte

• Luo, Xuanang
• Freychet, Guillaume
• Gan, Ziqi
• An, Kang
• Du, Huijun
• Wang, Cheng
• Li, Ning
• Zhong, Wenkai
• Ying, Lei

Titel

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

Ist Teil von

• Macromolecules, 2023-11, Vol.56 (21), p.8928-8938

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The development of efficient stretchable organic photovoltaics (OPVs) poses a challenge that requires addressing the coupling of morphology and electronic structure in donor/acceptor blended thin films, which represents the interplay between mechanical deformation and photophysical performance. In this study, intrachain modification is employed to enhance the stretchability of conjugated polymers PTzBI-Si and P­(NDI2OD-T2), which is a well-studied donor/acceptor combination in all-polymer solar cells. By introducing segments 1,2-di­(thiophen-2-yl)­ethene and 1,8-di­(thiophen-2-yl)­octane, the crack-onset strains of the polymer are significantly increased. This effect is achieved by randomizing the local intrachain conformation and tuning the crystalline packing and chain aggregation. The donor/acceptor pairing of the modified polymers is evaluated with their OPV performance, where the combination of PO-5:NV-10 shows well-balanced stretchability and performance. With the morphological optimization by the addition of the solvent additive dibenzyl ether, the PO-5:NV-10 thin film exhibits 1 order of magnitude increase in the crack-onset strain, surpassing 20%, along with a device efficiency of 8.45%, comparable to that of the reference blend. These findings highlight the importance of the optimal selection of donor/acceptor pairs in achieving intrinsically stretchable OPVs without compromising efficiency.