In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 17 ( 2022), p. 9408-9418
Abstract:
For the realization of highly efficient and thermally stable polymer solar cells (PSCs), we develop a new series of polymer donors (P D s) containing carbazole (Cz)-based units, N -dodecyl-carbazole[3,4- c :5,6- c ]bis[1,2,5] -thiadiazole (CBT). The coplanar penta-fused-ring structures of the CBT units coupled with π-conjugated bridges (thiophene (T) or thienothiophene (TT)) exhibit highly planar P D conformations that are non-covalently locked by secondary interactions. As a result, the series of P D s ( i.e. , P1, P2, and P3) exhibit superior electrical and photovoltaic properties. In particular, the TT–π-bridged P D s, P2 and P3, achieve high power conversion efficiencies (PCEs) of 13.17 and 14.58% when paired with Y6 acceptor, respectively, which outperform the T–π-bridged P D , P1 (10.78%). This result is attributed to the compact intermolecular packing, enhanced crystallinity, and extended conjugation of the P D s featuring TT. Furthermore, an even higher PCE of 15.54% is achieved by a P3-based ternary (P3:Y6:PC 71 BM) blend system. This PCE represents the highest among the PCEs of previously reported PSCs featuring Cz-based P D s. In addition, the P3:Y6 blend shows excellent thermal stability by maintaining 90% of its initial PCE after 144 h at 120 °C. Therefore, this study provides important molecular design rules for developing Cz-based P D s and realizing high-performance and thermally stable PSCs.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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