Reduced Intramolecular Twisting Improves the Performance of 3D Molecular Acceptors in Non‐Fullerene Organic Solar Cells

Lin, Haoran; Chen, Shangshang; Hu, Huawei; Zhang, Lu; Ma, Tingxuan; Lai, Joshua Yuk Lin; Li, Zhengke; Qin, Anjun; Huang, Xuhui; Tang, Benzhong; Yan, He

doi:10.1002/adma.201600997

Cited by 167 publications

(135 citation statements)

References 46 publications

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“…[70,71] used the low-band gap polymer PffBT4T-2DT with ffBT and quaterthiophene to pair with as eries of PDI-based non-fullerene acceptors.I no ne study,t hey combined PffBT4T-2DT with the non-fullerene acceptor SF-PDI 2 and obtained the best non-fullerene device with aP CE of 6.3 %. [68] developed ap olymer called PffBT-T3(1,2)-2 based on ffBT and terthiophene moieties and achieved a1 0.7 %P CE with PC 71 BM as the acceptor.E ven though PffBT-T3(1,2)-2 did well when blended with non-fullerene acceptors,t he resulting PCE (7.1 %) [73] was still much lower than the 10.7 %o ff ullerene system, suggesting that PffBT-T3(1,2)-2 could not work best with non-fullerene acceptors.I nt his case,t he same group designed the donor P3TEA [74] with decreased crystallinity and HOMO level by modifying the side chains of PffBT-T3(1,2)-2. In 2015, Yane tal.…”

Section: Copolymers Based On Btmentioning

confidence: 95%

“…In 2015, Yane tal. [68] developed ap olymer called PffBT-T3(1,2)-2 based on ffBT and terthiophene moieties and achieved a1 0.7 %P CE with PC 71 BM as the acceptor.E ven though PffBT-T3(1,2)-2 did well when blended with non-fullerene acceptors,t he resulting PCE (7.1 %) [73] was still much lower than the 10.7 %o ff ullerene system, suggesting that PffBT-T3(1,2)-2 could not work best with non-fullerene acceptors.I nt his case,t he same group designed the donor P3TEA [74] with decreased crystallinity and HOMO level by modifying the side chains of PffBT-T3(1,2)-2. We notice that P3TEA matches particularly well with PDIbased non-fullerene acceptors.O ne of the most impressive examples of this is the combination with SF-PDI 2 ;u pon employing P3TEA as the donor instead of PffBT4T-2DT,the PCE was boosted up to 9.5 %.…”

Section: Copolymers Based On Btmentioning

confidence: 95%

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Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

2019

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Over the past three years, non-fullerene (NF) organic solar cells (OSCs) have been a focus of research and their power conversion efficiencies have been improved dramatically from ~6% to over 14%. In addition to innovations in NF acceptors, the ongoing development of polymer donors has contributed significantly to the rapid progress of NF OSC performance. This review highlights the polymer donors that enable high-performance NF OSCs. We first review the impressive photovoltaic devices results achieved by some of important classes of conjugated polymer systems in NF OSCs. Then, we discuss molecular design strategies as far as developing matching polymer donors for NF acceptors. Finally, we conclude with a brief summary and outlook for advances in donor polymers to fulfill future commercialization.

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Section: Copolymers Based On Btmentioning

confidence: 95%

Section: Copolymers Based On Btmentioning

confidence: 95%

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

2019

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“…Thus, after adding the solvent additives, the two acceptors of D28 and D29 obtained the PCE performance of 3.50% and 2.20%, respectively. Recently, a novel nonfullerene small molecule acceptor D30 was designed and synthesized by Yan group, which was based on the tetraphenylpyrazine central core and four PDI units surrounding around the periphery. This molecule could obviously decrease the intermolecular twisting of this acceptor.…”

Section: Nonfullerene Small Molecule Acceptorsmentioning

confidence: 99%

Recent Advances in Nonfullerene Acceptors for Organic Solar Cells

Liu

Hou

et al. 2017

Macromol. Rapid Commun.

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Recently, research on nonfullerene acceptors in organic solar cells has gradually become a hot topic due to such superior characteristics of light absorption and energy-level-convenient manipulation, multiformity of the photoactive material structures, as well as the extensive area in production compared to the fullerene derivatives. However, the nonfullerene acceptors evolved slowly before 2012 and, as a matter of fact, the power conversion efficiency values could only bear 2.0%. Strikingly, nonfullerene acceptors have developed at a fast pace since 2013, with the best device performance of 13.1% now. In this review, recent research progress on nonfullerene acceptors, including small molecules and polymers, are sorted and summarized on the basis of the different characteristics.

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“…[14][15][16] Recently, nonfullerene PSCs, particularly those based on nonfullerene small molecular acceptors (SMAs) have been extensively explored as a potential replacement for fullerenes in the field of PSCs. [22][23][24][25][26][27][28][29][30][31][32] Amongst them, high PCEs have been reported using SMA materials based on electrondeficient group-fused units. [17][18][19][20][21] These progresses were driven by extensive efforts in the development of hundreds of novel SMAs during the past two years.…”

mentioning

confidence: 99%

Influence of Donor Polymer on the Molecular Ordering of Small Molecular Acceptors in Nonfullerene Polymer Solar Cells

Jiang

Chow

et al. 2017

Advanced Energy Materials

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Nonfullerene polymer solar cells (PSCs) based on polymer donors and nonfullerene small molecular acceptors (SMAs) have recently attracted considerable attention. Although much of the progress is driven by the development of novel SMAs, the donor polymer also plays an important role in achieving efficient nonfullerene PSCs. However, it is far from clear how the polymer donor choice influences the morphology and performance of the SMAs and the nonfullerene blends. In addition, it is challenging to carry out quantitative analysis of the morphology of polymer:SMA blends, due to the low material contrast and overlapping scattering features of the π–π stacking between the two organic components. Here, a series of nonfullerene blends is studied based on ITIC‐Th blended with five different donor polymers. Through quantitative morphology analysis, the (010) coherence length of the SMA is characterized and a positive correlation between the coherence length of the SMA and the device fill factor (FF) is established. The study reveals that the donor polymer can significantly change the molecular ordering of the SMA and thus improve the electron mobility and domain purity of the blend, which has an overall positive effect that leads to the enhanced device FF for nonfullerene PSCs.

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Reduced Intramolecular Twisting Improves the Performance of 3D Molecular Acceptors in Non‐Fullerene Organic Solar Cells

Cited by 167 publications

References 46 publications

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

Recent Advances in Nonfullerene Acceptors for Organic Solar Cells

Influence of Donor Polymer on the Molecular Ordering of Small Molecular Acceptors in Nonfullerene Polymer Solar Cells

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