18.4% efficiency achieved by the cathode interface engineering in non-fullerene polymer solar cells

Qin, Yang; Chang, Yilin; Zhu, Xiangwei; Gu, Xianrong; Guo, Lidan; Zhang, Yixiao; Wang, Qi; Zhang, Jianqi; Zhang, Xiaoli; Liu, Xinfeng; Lü, Kun; Zhou, Erjun; Wei, Zhixiang; Sun, Xiangnan

doi:10.1016/j.nantod.2021.101289

Cited by 51 publications

(44 citation statements)

References 54 publications

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“…[9] Furthermore, because of the large E b and short exciton lifetime, it is necessary to employ a BHJ structure with bicontinuous interpenetrating networks with nanoscale phase separation to facilitate exciton dissociation with the energy level difference, leading to morphology control issues. Thus, reducing E b is one of the key issues to achieve highly efficient OSCs.The past 3 years have witnessed the power conversion efficiency (PCE) of OSCs exceeding 18% [11,12] due to outstanding advantages of non-fullerene acceptors (NFAs) as follows: 1) strong absorption in the visible and near-infrared (NIR) area, benefiting for high short-circuit current density ( J SC ); 2) adjustable energy levels to achieve reduced energy loss and high open-circuit voltage (V OC ); and 3) various and simple chemical modifications. These advantages are believed to be closely related to its unique structure, which consists of a fused ring donor unit with side chains attached to a bridged atom (C or N), and two strongly electron-withdrawing units at both ends.…”

mentioning

confidence: 99%

“…The past 3 years have witnessed the power conversion efficiency (PCE) of OSCs exceeding 18% [11,12] due to outstanding advantages of non-fullerene acceptors (NFAs) as follows: 1) strong absorption in the visible and near-infrared (NIR) area, benefiting for high short-circuit current density ( J SC ); 2) adjustable energy levels to achieve reduced energy loss and high open-circuit voltage (V OC ); and 3) various and simple chemical modifications. These advantages are believed to be closely related to its unique structure, which consists of a fused ring donor unit with side chains attached to a bridged atom (C or N), and two strongly electron-withdrawing units at both ends.…”

mentioning

confidence: 99%

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Exciton Binding Energy of Non‐Fullerene Electron Acceptors

Zhu

Zhao

Wang

et al. 2022

Adv Energy and Sustain Res

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The past three years have witnessed the power conversion efficiency (PCE) of organic solar cells (OSCs) rocketing to over 18%, due to outstanding advantages of non‐fullerene acceptors (NFAs). However, large exciton binding energy (E b) caused by strong Coulombic force is still one of the main limiting factors for high‐performance OSCs. Thus, it is critical to reduce the E b for further enhancement of device performance. Many strategies have been developed to reduce the E b of organic materials previously. In this perspective, the calculation methods for E b and the relationship between E b and voltage loss (V loss) are discussed. Then, the effects of the properties of small‐molecule acceptors on E b from the perspectives of fused‐ring donor cores, end groups, side chains, and molecular packing are discussed. Finally, the potential directions for reducing E b and pointing out the trade‐off between E b and bandgaps/miscibility are put forward. It is hoped that this perspective could provide a new thinking of a molecular design for the breakthrough of OSCs.

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confidence: 99%

mentioning

confidence: 99%

Exciton Binding Energy of Non‐Fullerene Electron Acceptors

Zhu

Zhao

Wang

et al. 2022

Adv Energy and Sustain Res

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“…Since OSCs are fabricated by assembling each functional layer through a solution process, compatibility between each layer is an important issue for device performance 35 . In inverted devices, the presence of bottom CIMs can directly affect the deposition of the active layer above.…”

Section: Work Mechanism Of the Cathode Interlayersmentioning

confidence: 99%

“…27 However, the p-type nature of polyfluorene of PFN main chains and insulating properties of the nonconjugated organic molecules are undesirable for electron transport through the cathode interlayer. Therefore, n-type conjugated molecules with high electron affinity and high electron mobility, such as functional fullerenes, 28,29 n-doped carbon nanotubes and graphene, 20,30,31 naphthalene diimides (NDIs), [32][33][34][35] and perylene diimides (PDIs), [36][37][38] are more suitable and efficient as CIMs for modifying the cathode.…”

Section: Introductionmentioning

confidence: 99%

Perylene‐diimide‐based cathode interlayer materials for high performance organic solar cells

Jia

Chen

Zhang

et al. 2022

SusMat

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Organic solar cells (OSCs), benefiting from their significant advantages, such as light weight, flexibility, low cost, and large area manufacturing adaptability, are considered promising clean energy technologies. Currently, the power conversion efficiency (PCE) of state-of-the-art OSCs has reached over 18% through materials and device engineering. Specifically, cathode engineering with cathode interlayer materials (CIMs) is an important strategy to improve the PCEs and stability of OSCs. Among various CIMs reported in the literature, perylene diimides (PDIs) are more appropriate for working as cathode interlayers in OSCs owing to their distinct advantages of suitable energy levels, high electron affinity, high electron mobility, and facile modification. In this review, the mechanism of cathode engineering is concisely summarized, and recent research progress on PDI derivatives working as CIMs in OSCs is systematically reviewed. Finally, prospects and suggestions are provided for the development of PDI-based CIMs for practical applications.

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“…Solution-processed organic photovoltaic (OPV) cells are a clean energy technology with great commercial application prospects because of their unique features, such as high softness, light weight, colorful appearance and excellent ability to be translucent and wearable. 1–5 The past decade has witnessed dramatic advances in the performance of OPV cells and the reported power conversion efficiency (PCE) has surpassed 18%, 6–9 benefitting from the rapid development and innovation of new materials. However, the synthetic complexity and poor scalability of these new and high-efficiency materials result in considerably high production costs, 10–12 which put great constraints on the commercial development of OPVs.…”

Section: Introductionmentioning

confidence: 99%