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Improving Miscibility of Polymer Donor and Polymer Acceptor by Reducing Chain Entanglement for Realizing 18.64 % Efficiency All Polymer Solar Cells.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Aug 26; Vol. 63 (35), pp. e202405243. Date of Electronic Publication: 2024 Jul 25. - Publication Year :
- 2024
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Abstract
- All-polymer solar cells have experienced rapid development in recent years by the emergence of polymerized small molecular acceptors (PSMAs). However, the strong chain entanglements of polymer donors (P <subscript>D</subscript> s) and polymer acceptors (P <subscript>A</subscript> s) decrease the miscibility of the resulting polymer mixtures, making it challenging to optimize the blend morphology. Herein, we designed three P <subscript>A</subscript> s, namely PBTPICm-BDD, PBTPICγ-BDD and PBTPICF-BDD, by smartly using a BDD unit as the polymerized unit to copolymerize with different Y-typed non-fullerene small molecular acceptors (NF-SMAs), thus achieving a certain degree of distortion and giving the polymer system enough internal space to reduce the entanglements of the polymer chains. Such effects increase the chances of the P <subscript>D</subscript> being interspersed into the acceptor material, which improve the solubility between the P <subscript>D</subscript> and P <subscript>A</subscript> . The PBTPICγ-BDD and PBTPICF-BDD displayed better miscibility with PBQx-TCl, leading to a well optimized morphology. As a result, high power conversion efficiencies (PCEs) of 17.50 % and 17.17 % were achieved for PBQx-TCl : PBTPICγ-BDD and PBQx-TCl : PBTPICF-BDD devices, respectively. With the addition of PYFT-o as the third component into PBQx-TCl : PBTPICγ-BDD blend to further extend the absorption spectral coverage and finely tune microstructures of the blend morphology, a remarkable PCE of 18.64 % was realized finally.<br /> (© 2024 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 63
- Issue :
- 35
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 38861524
- Full Text :
- https://doi.org/10.1002/anie.202405243