Printable and Large‐Area Organic Solar Cells Enabled by a Ternary Pseudo‐Planar Heterojunction Strategy

Liu, Siqi; Chen, Dong; Hu, Xiaotian; Xing, Zhi; Wan, Ji; Zhang, Lin; Tan, Licheng; Zhou, Weihua; Chen, Yiwang

doi:10.1002/adfm.202003223

Cited by 65 publications

(54 citation statements)

References 47 publications

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“…As a result, the layer-by-layer (LbL, PHJ, and P-i-N) and pseudo-planar heterojunction structures show different stability, compared to the BHJ structure. [184][185][186] In the J71:ITC6-IC blend film, for instance, the LbL film shows a dramatically different vertical phase separation compared with the BHJ blend, leading to improved device stability (Figure 11). From the results of time-of-light secondary ion mass spectrometry (TOF-SIMS), it was found that the BHJ blend has a donor-rich surface.…”

Section: Morphologymentioning

confidence: 99%

Emerging Approaches in Enhancing the Efficiency and Stability in Non‐Fullerene Organic Solar Cells

Zhao

Zhang

et al. 2020

Advanced Energy Materials

140

117

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the center, side-chains hanging out from the molecular plane, and two strong compact electron-withdrawing end groups. Independent modifications of these three parts provide diverse NFA molecular structures, thus enabling strong absorption in the visible and/or near infrared (NIR) regions, easily tunable energy levels, and finely tunable crystallinity. [28-32] In addition, low voltage losses are a significant feature of NFA OSCs compared to their fullerene counterparts, contributing to the rapidly increasing PCE. [33-36] At the same time, the operational stability of NFA OSCs has also been demonstrated to be promising, [37-41] although further improvement is required to meet the standard for practical applications. Along with the rapid development of materials and devices, the fundamental understanding of OSCs is also moving forward, though at a slower pace compared with that of material development and device engineering. One of the greatest impediments to developing a fundamental understanding of OSCs lies in the bulk heterojunction (BHJ) structure. The invention of BHJ, which is a milestone in OSC research, increases the interfacial area between the electron donor and electron acceptor materials, overcoming the issues of short exciton diffusion length, limited exciton lifetime, and charge separation that limits bilayer junctions. [42] Together with these advantages, the BHJ structure also presents challenges. The multiple phases and complex interfaces bring about sophisticated hierarchical morphologies and complicated charge dynamics, which are difficult for experimental observation and control. In NFA-based systems, some of these challenges have even been manifested. The similarity in the element constitution makes it difficult to spatially distinguish the electron donor and electron acceptor materials. Additionally, the resemblance of energy makes the spectra indistinguishable for charge-transfer (CT) states and singlet excitons. [33] Furthermore, OSC materials are updated so fast that the new materials can be distinct from previous ones, and the characteristics may be entirely different. This review covers emerging approaches for enhancing the efficiency and stability of non-fullerene OSCs. We highlight that recent advances on non-fullerene OSCs result from the coordinated development of donors and acceptors; those who are interested in a comprehensive understanding of donor materials are referred to recent review articles on this topic. [43-49] In this review, we mainly focus on the development of acceptors. We summarize new strategies for high short-circuit current (J SC) and fill factor (FF). A variety of methods, for example, extended absorption and effective morphology control, are discussed. We also introduce design rules for low energy losses, especially by The past three years have witnessed rapid growth in the field of organic solar cells (OSCs) based on non-fullerene acceptors (NFAs), with intensive efforts being devoted to material development, device engineering, and understanding of device physi...

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Section: Morphologymentioning

confidence: 99%

Emerging Approaches in Enhancing the Efficiency and Stability in Non‐Fullerene Organic Solar Cells

Zhao

Zhang

et al. 2020

Advanced Energy Materials

140

117

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“…Notably, the PCE of 13.70% is the highest values reported for ITIC derivatives based binary OSCs, as shown in Scheme 1 . [ 6,15,37,39,40,44,47–59 ] Moreover, the relationship between the energy loss and the BHJ and PPHJ morphology was also systematically explored.…”

Section: Introductionmentioning

confidence: 99%

Revealing Morphology Evolution in Highly Efficient Bulk Heterojunction and Pseudo‐Planar Heterojunction Solar Cells by Additives Treatment

Sheng

Zhang

et al. 2021

Advanced Energy Materials

Self Cite

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108

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Additives treatment is as a very effective strategy to optimize bulk heterojunction (BHJ) morphology. However, the inherent working mechanism of this strategy still lacks systematical investigations in non‐fullerene‐acceptors‐based organic solar cells (OSCs). Herein, a series of BHJ and pseudo‐planar heterojunction (PPHJ) OSCs using PM6 and IT‐4F as the electron donor/acceptor pair, are developed to unveil the promoting effect of solvent additive 1, 8‐diiodooctane (DIO) on active layer morphologies and device performance. The study clearly demonstrates that DIO can increase the crystallinity of IT‐4F significantly, while it has less impact on PM6. It is notable that a new efficiency‐determining crystalline balanced factor (CCLpolymer/CCLacceptor) is put forward, indicating that the more balanced CCLpolymer/CCLacceptor results in more balanced charge mobility and much better short‐circuit current densities (Jsc) and fill factors (FF) of OSCs. The PPHJ blend film of PM6/IT‐4F(DIO) exhibits enhanced crystallinity with more balanced CCL and favorable hierarchical distribution morphology, contributing to a champion efficiency of 13.70% with a record Jsc of 20.98 mA cm−2 and a remarkable FF of 75.9%. This work not only reveals the underlying mechanism of DIO caused morphology evolution, but also achieves highly efficient PPHJ OSCs with superior thermal stability by elaborately controlling the morphology of PPHJ film.

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“…In addition, the ternary bilayer blade method provides an effective way for large‐area manufacturing and future applications of OSCs. [ 10 ] Ren et al demonstrated the universality of the ternary strategy for LbL OSCs. They doped small‐molecule FBR into different systems to prepare PffBT4T‐2OD/IEICO‐4F: FBR, PBDB‐T‐SF/IT‐4F: FBR, and PM6/Y6: FBR bilayer devices.…”

Section: Methods To Improve the Performance Of Lbl Solution‐processedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[8,9] Moreover, if the third component is introduced to improve the performance of devices, or OSCs are fabricated on a large scale, the problem of the uncontrollable morphology of BHJ will be aggravated. [10][11][12] Compared with BHJ, the LbL solution processing method with many advantages is a cost-effective alternative way. [13][14][15][16] Firstly, good contact between the material and the corresponding electrodes can be ensured by sequentially spin coating materials.…”

Section: Introductionmentioning

confidence: 99%

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Layer‐by‐Layer Solution Processing Method for Organic Solar Cells

Zhao

et al. 2020

Solar RRL

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Organic solar cells (OSCs) have attracted wide attention due to their economy, environmental protection, and potential for large-scale commercial production. The layer-by-layer (LbL) solution processing method, where donor solution and acceptor solution are coated sequentially, is a simple and effective way to fabricate OSCs, achieving a high power conversion efficiency (PCE) of up to 17%. Compared with bulk-heterojunction (BHJ) OSCs, LbL solution-processed OSCs separately adjust different layers, making the components distribute ideally in the vertical direction that is beneficial for exciton dissociation, charge transport, and charge collection. Moreover, the LbL approach has better potential in the preparation of large-area devices, which is a key link in the commercialization of OSCs. Herein, the basic principles and the latest research progress of LbL solution-processed OSCs are summarized, and the existing challenges and prospects of the LbL solution processing method in industrial production are discussed.

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Printable and Large‐Area Organic Solar Cells Enabled by a Ternary Pseudo‐Planar Heterojunction Strategy

Cited by 65 publications

References 47 publications

Emerging Approaches in Enhancing the Efficiency and Stability in Non‐Fullerene Organic Solar Cells

Emerging Approaches in Enhancing the Efficiency and Stability in Non‐Fullerene Organic Solar Cells

Revealing Morphology Evolution in Highly Efficient Bulk Heterojunction and Pseudo‐Planar Heterojunction Solar Cells by Additives Treatment

Layer‐by‐Layer Solution Processing Method for Organic Solar Cells

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