Isomery‐Dependent Miscibility Enables High‐Performance All‐Small‐Molecule Solar Cells

Wu, Hao; Fan, Haijun; Xu, Shengjie; Ye, Long; Guo, Yuan; Yi, Yuanping; Ade, Harald; Zhu, Xiaozhang

doi:10.1002/smll.201804271

Cited by 57 publications

(54 citation statements)

References 57 publications

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“…The similar phenomenon on phase separation degree variation can also be observed from TEM images of the binary and the ternary blend films, as exhibited in Figure c. The dark and bright regions in TEM image are normally assigned as acceptor‐rich and donor‐rich domain, respectively . No obvious characteristics can be observed from the TEM image of PM6:T6Me blend films.…”

Section: Resultssupporting

confidence: 74%

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

Wang

Ming

et al. 2019

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Organic photovoltaics (OPVs) are fabricated with PM6 as donor and T6Me, IT‐2F, or their mixture as acceptor. A 13.36% power conversion efficiency (PCE) is achieved from the optimized ternary OPVs with 50 wt% IT‐2F in acceptors, which is attributed to the enhanced photon harvesting of ternary active layers and improved exciton utilization efficiency through energy transfer from IT‐2F to T6Me. The efficient energy transfer from IT‐2F to T6Me can be confirmed from the photoluminescence spectra of neat and blend films, which may provide additional channels to enhance exciton utilization efficiency for achieving short‐circuit current density (JSC) improvement of ternary OPVs. It should be highlighted that the fill factor (FF) of ternary OPVs can be monotonously increased along with the incorporation of IT‐2F, indicating the gradually optimized phase separation degree of ternary active layers. The third component IT‐2F plays a key role in optimizing phase separation as a morphology regulator. Over 8% PCE improvement is achieved in the optimized ternary OPVs compared with the over 12% PCEs of the corresponding binary OPVs, respectively. This work indicates that the performance of ternary OPVs can be well optimized by carefully picking materials with good compatibility and complementary absorption spectra, as well as the appropriate energy levels.

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Section: Resultssupporting

confidence: 74%

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

Wang

Ming

et al. 2019

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“…However, these acceptors have non‐negligible shortcomings: the E loss is relatively large that is commonly between 0.6 and 0.8 eV and their absorption edges are at around 765–800 nm that cannot take full advantage of the light in near‐infrared (NIR) region, largely limiting the increase in J sc . NBDTP‐F out ( E g opt : 1.41 eV) reported by Zhu and co‐workers and 6TIC ( E g opt : 1.37 eV) by Jen and co‐workers that have redshifted absorption spectra achieved PCEs of 11.2% and 12.08% with high J sc s, 21.87 and 20.44 mA cm −2 in SMSCs based on BDT3TR‐SF:NBDTP‐F out and ZnP‐TBO:6TIC blends, respectively. Therefore, excellent and matched photoelectric properties are the primary conditions in obtaining high‐performance SMSCs.…”

Section: Photovoltaic Parameters Of Bsftr:y6‐based Smscs Under the Ilmentioning

confidence: 79%

13.7% Efficiency Small‐Molecule Solar Cells Enabled by a Combination of Material and Morphology Optimization

et al. 2019

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Compared with the quick development of polymer solar cells, achieving high‐efficiency small‐molecule solar cells (SMSCs) remains highly challenging, as they are limited by the lack of matched materials and morphology control to a great extent. Herein, two small molecules, BSFTR and Y6, which possess broad as well as matched absorption and energy levels, are applied in SMSCs. Morphology optimization with sequential solvent vapor and thermal annealing makes their blend films show proper crystallinity, balanced and high mobilities, and favorable phase separation, which is conducive for exciton dissociation, charge transport, and extraction. These contribute to a remarkable power conversion efficiency up to 13.69% with an open‐circuit voltage of 0.85 V, a high short‐circuit current of 23.16 mA cm−2 and a fill factor of 69.66%, which is the highest value among binary SMSCs ever reported. This result indicates that a combination of materials with matched photoelectric properties and subtle morphology control is the inevitable route to high‐performance SMSCs.

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“…Compared with polymer-based OSC, NFSM-OSC is more suitable as a research model device, which can more easily establish clear relationships between the structure and performance [4][5][6][7][8]. However, the power conversion efficiencies (PCEs) of current state-of-the-art NFSM-OSCs are still much lower than that of polymer-based OSCs because small molecules cannot form pre-aggregation in solution like most high-performance polymers [9-11], and have similar acceptor-donor-acceptor (A-D-A) skeleton structures with high efficiency non-fullerene acceptors, making it difficult to regulate their morphology [12][13][14][15][16][17][18][19][20][21]. To date, though considerable efforts have been made in the research of NF acceptors and a number of high-performing materials have been reported, the study on small molecule donors for efficient NFSM-OSCs is relatively lagging [1, [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

15.3% efficiency all-small-molecule organic solar cells enabled by symmetric phenyl substitution

et al. 2020

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Synergistic optimization of donor-acceptor blend morphologyis a hurdle in the path of realizing efficient non-fullerene small-molecule organic solar cells (NFSM-OSCs) due to the anisotropic conjugated backbones of both donor and acceptor. Therefore, developing a facile molecular design strategy to effectively regulate the crystalline properties of photoactive materials, and thus, enable the optimization of blend morphology is of vital importance. In this study, a new donor molecule B1, comprising phenyl-substituted benzodithiophene (BDT) central unit, exhibits strong interaction with the non-fullerene acceptor BO-4Cl in comparison with its corresponding thiophene-substituted BDT-based material, BTR. As a result, the B1 is affected and induced from an edgeon to a face-on orientation by the acceptor, while the BTR and the acceptor behave individually for the similar molecular orientation in pristine and blend films according to grazing incidence wide angle X-ray scattering results. It means the donor-acceptor blend morphology is synergistically optimized in the B1 system, and the B1:BO-4Cl-based devices achieve an outstanding power conversion efficiency (PCE) of 15.3%, further certified to be 15.1% by the National Institute of Metrology, China. Our results demonstrate a simple and effective strategy to improve the crystalline properties of the donor molecule as well as synergistically optimize the morphology of the all-small-molecule system, leading to the high-performance NFSM-OSCs.

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Isomery‐Dependent Miscibility Enables High‐Performance All‐Small‐Molecule Solar Cells

Cited by 57 publications

References 57 publications

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

Two Well‐Compatible Acceptors with Efficient Energy Transfer Enable Ternary Organic Photovoltaics Exhibiting a 13.36% Efficiency

13.7% Efficiency Small‐Molecule Solar Cells Enabled by a Combination of Material and Morphology Optimization

15.3% efficiency all-small-molecule organic solar cells enabled by symmetric phenyl substitution

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