2020
DOI: 10.1002/aenm.202002678
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Crystal Engineering in Organic Photovoltaic Acceptors: A 3D Network Approach

Abstract: The power conversion efficiency of organic solar cell (OSC) devices has surpassed 18% rapidly. In order to further promote OSC development, it is necessary to understand the packing information at the atomic level to help develop acceptor systems with superior performance. The packing arrangements and intermolecular interactions of these acceptors in the solid state, observed by single crystal X‐ray crystallography, are often used to design materials with expected physicochemical properties. In this review, th… Show more

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Cited by 105 publications
(105 citation statements)
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“…It has been evidenced that the synergistic effects of H‐ and J‐aggregations allow Y‐series NFAs to construct the elliptical 3D network packing structure, which contributes to facilitating charge transfer and transport in the actual devices. [ 67 ] The blue‐shifted PL peak demonstrates that the cooperative H‐type and J‐type aggregates have gradually transformed into the H‐aggregation polycrystalline structure with the slightly higher energy states in binary PM6:BTP‐4Cl system (Figure 5e). [ 67,68 ] More importantly, the emission bands independent on aging time solidly prove that the coordinated H/J aggregates have been well maintained after incorporating two types of the alloy states, sequentially explaining why the corresponding blend morphologies are more stable without the over‐sized crystals appearing in ternary photoactive layers.…”
Section: Resultsmentioning
confidence: 99%
“…It has been evidenced that the synergistic effects of H‐ and J‐aggregations allow Y‐series NFAs to construct the elliptical 3D network packing structure, which contributes to facilitating charge transfer and transport in the actual devices. [ 67 ] The blue‐shifted PL peak demonstrates that the cooperative H‐type and J‐type aggregates have gradually transformed into the H‐aggregation polycrystalline structure with the slightly higher energy states in binary PM6:BTP‐4Cl system (Figure 5e). [ 67,68 ] More importantly, the emission bands independent on aging time solidly prove that the coordinated H/J aggregates have been well maintained after incorporating two types of the alloy states, sequentially explaining why the corresponding blend morphologies are more stable without the over‐sized crystals appearing in ternary photoactive layers.…”
Section: Resultsmentioning
confidence: 99%
“…(5) Is it possible to form cocrystal [21][22][23][24] of Y6-based acceptors in ternary BHJ films for higher PCEs? With the above considerations in mind, we noted recent papers discussing these interesting topics, but only few reviews [25][26] summarizing research efforts on Y6 and its derivatives. Thus, assembling a critical discussion should provide better molecular design guidance and mechanism insights for future research in this field.…”
Section: Introductionmentioning
confidence: 99%
“…However, the fundamental rationale behind this observation is difficult to probe in thin films due to the complex nature of the local and global morphologies. Thus, one approach is to investigate the differences in molecular packing via single-crystal X-ray diffraction [24]. Although thin films of these non-fullerene acceptors are not entirely crystalline, such an approach can be useful as some degree of crystallinity is retained after processing [25].…”
Section: Introductionmentioning
confidence: 99%