A universal layer-by-layer solution-processing approach for efficient non-fullerene organic solar cells

Sun, Rui; Guo, Jing; Sun, Chenkai; Wang, Tao; Luo, Zhenghui; Zhang, Zhuohan; Jiao, Xuechen; Tang, Weihua; Yang, Chuluo; Li, Yongfang; Min, Jie

doi:10.1039/c8ee02560f

Cited by 203 publications

(212 citation statements)

References 55 publications

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“…Moreover, the doctor blading ternary devices (0.1 cm 2 active layer area) were also fabricated (Figure S12, Supporting Information). An outstanding PCE of 12.6% with J SC of 21.3 mA cm −2 , V OC of 857 mV, and FF of 68.8% was achieved, which is one of the highest value of doctor‐blading devices . The excellent tolerance of m ‐INPOIC as‐cast OSCs to active layer thickness and high efficient devices with analog industrial treatment make it attractive for mass production of large‐area devices with industrial solution‐processing techniques.…”

Section: Resultsmentioning

confidence: 98%

Molecular Orientation Unified Nonfullerene Acceptor Enabling 14% Efficiency As‐Cast Organic Solar Cells

Feng

Song

Zhang

et al. 2019

Adv Funct Materials

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Molecular orientation and π-π stacking of nonfullerene acceptors (NFAs) determine its domain size and purity in bulk-heterojunction blends with a polymer donor. Two novel NFAs featuring an indacenobis(dithieno[3,2-b:2′,3′-d] pyrrol) core with meta-or para-alkoxyphenyl sidechains are designed and denoted as m-INPOIC or p-INPOIC, respectively. The impact of the alkoxyl group positioning on molecular orientation and photovoltaic performance of NFAs is revealed through a comparison study with the counterpart (INPIC-4F) bearing para-alkylphenyl sidechains. With inward constriction toward the conjugated backbone, m-INPOIC presents predominant face-on orientation to promote charge transport. The as-cast organic solar cells (OSCs) by blending m-INPOIC and PBDB-T as active layers exhibit a power conversion efficiency (PCE) of 12.1%. By introducing PC 71 BM as the solid processing-aid, the ternary OSCs are further optimized to deliver an impressive PCE of 14.0%, which is among the highest PCEs for as-cast single-junction OSCs reported in literature to date. More attractively, PBDB-T:m-INPOIC:PC 71 BM based OSCs exhibit over 11% PCEs even with an active layer thickness over 300 nm. And the devices can retain over 95% of PCE after storage for 20 days. The outstanding tolerance to film thickness and outstanding stability of the as-cast devices make m-INPOIC a promising candidate NFA for large-scale solutionprocessable OSCs.

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Section: Resultsmentioning

confidence: 98%

Molecular Orientation Unified Nonfullerene Acceptor Enabling 14% Efficiency As‐Cast Organic Solar Cells

Feng

Song

Zhang

et al. 2019

Adv Funct Materials

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confidence: 99%

Rational Strategy to Stabilize an Unstable High‐Efficiency Binary Nonfullerene Organic Solar Cells with a Third Component

Zhu

Gadisa

Peng

et al. 2019

Advanced Energy Materials

139

143

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decades, heuristic approaches have been successfully used to enhance the performance of OSCs, including synthesis of new donor and acceptor molecules, [5][6][7][8][9][10] optimization of the interface and morphology, [11][12][13][14][15] ternary blending, [16][17][18][19] and device engineering. [20][21][22][23] As a result, power conversion efficiency (PCE) of OSCs has surpassed 15% for single-layer bulkheterojunction systems. [24,25] As the PCE of OSCs is getting closer to the requirements for commercial applications and competing technology, the most efficient OSCs also need to perform consistently or maintain low efficiency loss throughout their lifetimes. [26][27][28] To make organic photovoltaics commercially viable and competitive, researchers have been making efforts on characterizing, understanding, and rationally engineering the long-term stability of OSC devices. [26,[29][30][31][32][33][34][35][36][37][38] Generally, the performance degradation of OSCs comes from the oxidation of electrodes, degradation of the interface layers, and changes in the morphology of the active layer. Among these factors, the oxidation of electrodes and the degradation of the interface layers are attributed to exposure to oxygen and moisture, [39,40] and these drawbacks can be largely prevented by encapsulation. [41,42] However, the intrinsic instability of active layer morphology driven by light, temperature, and thermodynamics cannot be prevented by encapsulation. In-depth studies were carried out to understand the stability of the active layers under multiple stresses. [43] For instance, McGehee and co-workers [29] reported that solar cells based on amorphous materials would suffer from open-circuit voltage (V OC ) burnin degradation resulted from the impact of light-induced traps, and this degradation can be reduced by using materials with high degree of crystallinity. Brabec group [33] demonstrated that the light-induced [6,6]-phenyl-C 61 -butyric acid methyl ester (PCBM) dimerization would lead to the short-circuit current density (J SC ) loss after aging, while this dimerization can be inhibited by a high degree of polymer-fullerene mixing and it can also be reduced via increasing the crystallization of the fullerene domains. Brabec and co-workers [34] found that burnin degradation driven by low miscibility is the major short-time Long device lifetime is still a missing key requirement in the commercialization of nonfullerene acceptor (NFA) organic solar cell technology. Understanding thermodynamic factors driving morphology degradation or stabilization is correspondingly lacking. In this report, thermodynamics is combined with morphology to elucidate the instability of highly efficient PTB7-Th:IEICO-4F binary solar cells and to rationally use PC 71 BM in ternary solar cells to reduce the loss in the power conversion efficiency from ≈35% to <10% after storage for 90 days and at the same time improve performance. The hypomiscibility observed for IEICO-4F in PTB7-Th (below the percolation threshold) leads to overpurific...

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“…Min applied the LbL processing approach for the IDIC ( 3.1 ) : PTQ10 ( 2.21 ) system and a PCE of 13.32 % was attained, which was higher than its corresponding BHJ structure‐based OSC (11.75 %). Additionally, they fabricated relatively large area (1 cm 2 ) LbL OSCs through blade coating, leading to a PCE of 10.42 %, which is the highest performance for large area LbL OSCs till now . Later, the same group probed the difference between blading coated LbL and BHJ OSCs based on the ITC6‐IC : J71 system in‐depth.…”

Section: Nfsmas For Additive‐free Oscsmentioning

confidence: 99%

Additive‐Free Non‐Fullerene Organic Solar Cells

et al. 2019

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With the extensive research efforts paid over the past 30 years, the power conversion efficiency of organic solar cells (OSCs) has been steadily improved from below 1 % to greater than 16 %. While fullerene derivatives have traditionally played a dominant role as acceptor materials in the first two decades, the distinctive advantages of non‐fullerene acceptors, such as tunable energy levels, broad absorption, and improved device stability, have rendered them as the mainstream acceptors in OSCs, recently. However, in most cases, processing additives are required for morphology optimization of the photoactive layer, and these additives usually possess high boiling point, which makes it difficult to remove them completely. The residual additives would accelerate performance deterioration, leading to poor device stability. Furthermore, the tedious optimization of additives complicates device fabrication and decreases performance reproducibility. In this review, we summarize the recent works based on non‐fullerene OSCs without using additives, affording insights into materials design and device fabrication for enabling highly efficient additive‐free non‐fullerene OSCs, which should be critical for the practical applications of OSCs.

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A universal layer-by-layer solution-processing approach for efficient non-fullerene organic solar cells

Abstract: A universal layer-by-layer solution-processing approach is proven to be effective for the fabrication of high-performance non-fullerene organic solar cells.

Cited by 203 publications

References 55 publications

Molecular Orientation Unified Nonfullerene Acceptor Enabling 14% Efficiency As‐Cast Organic Solar Cells

Molecular Orientation Unified Nonfullerene Acceptor Enabling 14% Efficiency As‐Cast Organic Solar Cells

Rational Strategy to Stabilize an Unstable High‐Efficiency Binary Nonfullerene Organic Solar Cells with a Third Component

Additive‐Free Non‐Fullerene Organic Solar Cells

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