期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202001203
关键词
charge extraction; charge generation; charge recombination; non-fullerene acceptors; resonant soft X-ray scattering; solid-state NMR; voltage losses
类别
资金
- Department of the Navy, Office of Naval Research Award [N00014-14-1-0580]
- Schlumberger foundation
- Alexandervon-Humboldt Stiftung
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- MRSEC Program of the NSF - NSF [DMR-170256]
- U.S. Office of Naval Research (ONR) [N000141712204]
- VEGA [2/0081/18]
- Center for Advanced Material Application, SAS
- Simons Foundation [601946]
- EPSRC [EP/M005143/1] Funding Source: UKRI
Even though significant breakthroughs with over 18% power conversion efficiencies (PCEs) in polymer:non-fullerene acceptor (NFA) bulk heterojunction organic solar cells (OSCs) have been achieved, not many studies have focused on acquiring a comprehensive understanding of the underlying mechanisms governing these systems. This is because it can be challenging to delineate device photophysics in polymer:NFA blends comprehensively, and even more complicated to trace the origins of the differences in device photophysics to the subtle differences in energetics and morphology. Here, a systematic study of a series of polymer:NFA blends is conducted to unify and correlate the cumulative effects of i) voltage losses, ii) charge generation efficiencies, iii) non-geminate recombination and extraction dynamics, and iv) nuanced morphological differences with device performances. Most importantly, a deconvolution of the major loss processes in polymer:NFA blends and their connections to the complex BHJ morphology and energetics are established. An extension to advanced morphological techniques, such as solid-state NMR (for atomic level insights on the local ordering and donor:acceptor pi-pi interactions) and resonant soft X-ray scattering (for donor and acceptor interfacial area and domain spacings), provide detailed insights on how efficient charge generation, transport, and extraction processes can outweigh increased voltage losses to yield high PCEs.
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