Ternary nonfullerene polymer solar cells with efficiency &gt;13.7% by integrating the advantages of the materials and two binary cells

Gao, Wei; Yu, Jiangsheng; An, Qiaoshi; Zhang, Miao; Hu, Zhenghao; Wang, Jianxiao; Tang, Weihua; Yang, Chuluo; Zhang, Fujun

doi:10.1039/c8ee01107a

Cited by 227 publications

(130 citation statements)

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“…[57] Generally, the α value is approximately equal to 1, indicating the fewest bimolecular recombination of active layer. [6,34] The n values were 1.15 (10 wt% DRCN5T), 1.28 (20 wt% DRCN5T), 1.30 (30 wt% DRCN5T), and 1.45 (40 wt% DRCN5T) for the ternary OSCs, which is smaller than the n value of 1.46 for the binary PTB7-Th:PC 70 BM system. For the optimized ternary OSCs, the highest α value of 0.998 was calculated, which was very close to 1, suggesting the weakest bimolecular recombination.…”

Section: Resultsmentioning

confidence: 85%

“…[13] What is more, another novel device, tandem OSC, [24] consisting of two or more sub-cells has achieved a record-breaking efficiency of 17.3%. [6,[32][33][34] Unfortunately, most of the research work about how to select appropriate third additive is based on the trial and error strategy, which is a process of labor and time consumption. [31] And the ternary OSCs literatures have been widely published in recent years including fullerene and non-fullerene systems.…”

Section: Introductionmentioning

confidence: 99%

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Miscibility Tuning for Optimizing Phase Separation and Vertical Distribution toward Highly Efficient Organic Solar Cells

et al. 2019

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Blending multidonor or multiacceptor organic materials as ternary devices has been recognized as an efficient and potential method to improve the power conversion efficiency of bulk heterojunction devices or single‐junction components in tandem design. In this work, a highly crystalline molecule, DRCN5T, is involved into a PTB7‐Th:PC 70 BM system to fabricate large‐area organic solar cells (OSCs) whose blend film thickness is up to 270 nm, achieving an impressive performance of 11.1%. The significant improvement of OSCs after adding DRCN5T is due to the formation of an interconnected fibrous network with decreased π–π stacking and enhanced domain purity, in addition to the optimized vertical distribution of PTB7‐Th and PC 70 BM, producing more effective charge separation, transport, and collection. The optimized morphology and performance are actually determined by the miscibility in different components, which can be quantitatively described by the Flory–Huggins interaction parameter of −0.80 and 2.94 in DRCN5T:PTB7‐Th and DRCN5T:PC 70 BM blends, respectively. The findings in this work can potentially guide the selection of an appropriate third additive for high‐performance OSCs for the sake of large‐area printing and roll‐to‐roll fabrication from the view of miscibility.

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Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Miscibility Tuning for Optimizing Phase Separation and Vertical Distribution toward Highly Efficient Organic Solar Cells

et al. 2019

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“…The η d and η c of IT‐2F‐based binary OPVs are larger than those of the optimized ternary OPVs and T6Me‐based binary OPVs, which can well support the relatively high FF of IT‐2F‐based binary OPVs. Meanwhile, the 94.8% η d and 82.4% η c of the optimized ternary OPVs are markedly improved in comparison with T6Me‐based binary OPVs, which can well explain the enhanced FFs …”

Section: Resultsmentioning

confidence: 76%

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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“…[1][2][3][4][5][6][7][8] Evolution of nonfullerene acceptor particularly plays a vital role for achieving highperformance OPVs. [17][18][19][20][21][22][23][24][25][26] SVA is an efficient postprocessing technique to control the morphology of active layers, which provides molecular mobility for local rearrangement by penetrating solvent vapor into the active layer. [9][10][11][12][13][14][15][16] For device optimization, various methods have been developed to control the morphology and enhance the photon harvesting of active layer for further improving the performance of OPVs, including solvent vapor annealing (SVA), solvent additives, thermal annealing, and ternary strategy.…”

Section: Introductionmentioning

confidence: 99%

Nonfullerene organic photovoltaic cells exhibiting 13.76% efficiency by employing upside‐down solvent vapor annealing

Jiao

Pang

2019

Int J Energy Res

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Summary Organic photovoltaic cells (OPVs) are fabricated with a polymer donor PM7 and a nonfullerene acceptor IT‐4Cl; the morphology of active layers is optimized by employing upside‐down solvent vapor annealing (UD‐SVA) method with different annealing solvents. The OPVs with CS2 as annealing solvent exhibit optimized power conversion efficiency (PCE) of 13.76%, with simultaneously increased short‐circuit current density (JSC) of 20.53 mA cm−2 and fill factor (FF) of 77.05%. More than 15% PCE improvement can be achieved by employing CS2 UD‐SVA treatment, which should be attributed to slightly enhanced photon harvesting, efficient exciton separation, charge transport, and collection, resulting from the well‐developed morphology of active layer. Moreover, the PM7:IT‐4Cl–based OPVs with CS2 as annealing solvent still can maintain PCE more than 13% in a wide treatment time range from 20 to 90 seconds. This work demonstrated that UD‐SVA has great potential in improving the performance of nonfullerene OPVs.

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Ternary nonfullerene polymer solar cells with efficiency >13.7% by integrating the advantages of the materials and two binary cells

Abstract: By integrating the advantages of the materials and two binary PSCs into one cell, a PCE of 13.73% is achieved in ternary PSCs.

Cited by 227 publications

References 51 publications

Miscibility Tuning for Optimizing Phase Separation and Vertical Distribution toward Highly Efficient Organic Solar Cells

Miscibility Tuning for Optimizing Phase Separation and Vertical Distribution toward Highly Efficient Organic Solar Cells

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

Nonfullerene organic photovoltaic cells exhibiting 13.76% efficiency by employing upside‐down solvent vapor annealing

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