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a??Double-Acceptor-Typea?? Random Conjugated Terpolymer Donors for Additive-Free Non-Fullerene Organic Solar Cells
摘要： Random conjugated terpolymers (RCTs) not only promote great comprehension and realization for state-of-the-art high effective non-fullerene polymer solar cells (OSCs) but also offer a simple and practical synthetic strategy. However, the photovoltaic properties of RCTs yet lagged behind that of the donor-acceptor alternating copolymer, especially in the additive-free devices. Hence, we developed two feasible “double acceptor type” random conjugated terpolymers, PBDB-TAZ20 and PBDB-TAZ40. The additive-free OSCs based on PBDB-TAZ20:ITIC and PBDB-TAZ40:ITIC exhibit decent efficiencies of 12.34% and 11.27%, respectively, which both surpass the PBDB-T:ITIC-based device. For the RCTs, the reasonably weakened crystallinity and reduced phase separation degree are demonstrated to help improve charge transport, reduce bimolecular recombination and thus enhance the photovoltaic performance of the additive-free OSCs. The results imply that adding a third moiety into the D-A polymer donors provides a simple but efficient synthetic approach for high-performance OSCs.
关键词： polymer solar cells,crystallinity,non-fullerenes,morphology,random terpolymers
更新于2025-09-23 15:19:57
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Highly Efficient Large Area Organic Photovoltaic Module with 350 nm Thick Active Layer using Random Terpolymer Donor
摘要： Random terpolymers are developed by incorporating small portions of benzodithiophene into a highly crystalline copolymer of terthiophene and difluorobenzothiadiazole, BDT-Th0. The bulk-heterojunction (BHJ) of the copolymer BDT-Th0 is formed by process of rapid solid-liquid phase demixing of polymer crystallites, which results in irregular and unclear phase separation with large polymer aggregation. By contrast, the random terpolymer BDT-Th10 which was prepared using 10% feed molar ratio of a benzodithiophene moiety shows slower and gradual formation of the polymer packing structures without substantial agglomeration from loosely packed pseudo-crystallites in precursor solution. This results in optimal BHJ morphology with appropriate phase separation and improved domain purity. BDT-Th10 achieves high solar cell efficiency of 7.74% by successfully reproducing the optimized BHJ morphology of small cells into 58.5 cm2 sized modules with 350 nm film thickness, whereas the copolymer shows irreproducible property with much decreased efficiency of 4.37%. This result is among the highest efficiency of high-performance large area PSC modules with such a thick active film.
关键词： Random terpolymers,benzodithiophene,bulk-heterojunction,large area modules,polymer solar cells
更新于2025-09-19 17:13:59