A 19% efficient and stable organic photovoltaic device enabled by a guest nonfullerene acceptor with fibril-like morphology

Lin, Yuanbao; Chen, Hu; Jeong, Sang Young; Tian, Junfu; Naphade, Dipti R; Zhang, Yadong; Alsufyani, Maryam; Zhang, Weimin; Griggs, Sophie; Hu, Hanlin; Barlow, Stephen; Woo, Han Young; Marder, Seth R.; Anthopoulos, Thomas D.; McCulloch, Iain

doi:10.1039/d2ee03483b

Cited by 85 publications

(71 citation statements)

References 52 publications

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“…[1][2][3][4] In recent years, thanks to the innovation of the photovoltaic materials, interface engineering and the morphology modulation of active layer, the power conversion efficiencies (PCEs) of single-junction OSCs based on polymer donors: small molecule acceptors (SMAs) have exceeded 19%. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Among various systems of OSCs, all-polymer solar cells (all-PSCs), which contain both polymer donors (P D s) and polymer acceptors (P A s) in the active layer, possess great potential for practical applications due to the remarkable merits such as superior stability, mechanical flexibility, and stress robustness. [22][23][24][25][26][27][28] However, quite few all-PSCs can afford impressive PCEs of over 17%, which lag far behind those of SMAsbased OSCs.…”

Section: Introductionmentioning

confidence: 99%

Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Zhang

Chen

et al. 2023

Advanced Energy Materials

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(2 of 10)that of SMAs limits the short-circult current densities (J SC s), and the unfavorable morphology caused by large conjugated lengths ang high molecular weights of P A and P D materials tends to suppress the fill factors (FFs). [38][39][40][41][42] To solve these issues, "polymerized small molecule acceptor" (PSMA) strategy, [43,44] ternary strategy, [45] and device engineering [30,31,33,46] are considered as efficient approaches to be developed continually. Among various device optimization methods, fabricating the ternary blends has been proved as an advantageous and simple strategy to uplift device performance. It is worth noting that the third component plays an important role in enhancing light absorption, facilitating charge transfer, and optimizing nanoscale morphology in the ternary systems. [34,47] In previous work on all-PSCs, the third components could be P D s, P A s, or small molecule acceptors. [26,29,34,48,49] For example, the strategy of choosing a similar P A to the host one in chemical structure as the third component was reported by Min et al., which improved PCE and stability simultaneously. [24] Recently, Hou and co-workers introduced PM6 with a high molecular weight into the all-PSCs system to afford efficient pathways for charge transport and mechanical stress dissipation, so that the ternary device demonstrated the PCE of 18.2% with outstanding mechanical properties. [26] However, because of the difficulty to alter morphology in all-PSCs devices, it is rather challenging to find proper third components, especially a universal one. Recently, Wei et al. reported a "N-π-N" type oligomeric acceptor, which falls in between SMA and P A and inherited the advantages of both them. Compared to its corresponding SMA, it performed higher tolerance for additive contents, as well as superior stability. While compared to its polymeric counterparts, it could obtain definite molecular structure, increased extinction coefficient, and absence of chains entanglements. [42] However, the oligomeric acceptors have not been considered to introduce in all-PSCs systems so far. [40,[50][51][52][53] Based on this point, it is urgent and significative to study the influence of an oligomeric acceptor as the third component on the performance and mechanical robustness in all-PSCs systems.With these in mind, we designed and synthesized a polymer acceptor (named PZC24) through linking CH-series SMA [54][55][56] by the fluoro-substituted thiophene π bridge. By blending PZC24 with the polymer donor PM6, a decent PCE of 16.82% is achieved. Furthermore, an "N-π-N" type oligomeric acceptor (CH-D1), which has the same core blocks (N type) and linking units (π bridge) as PZC24, was designed and added in PM6:PZC24 system as the third component. Based on the same structure, CH-D1 can be referred as "twins" molecule with PZC24. Therefore, this ternary strategy avoids the complicated selection and additional synthesis for the third component. More importantly, the introduction of CH-D1 leads to stronger crystallinity and more...

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Section: Introductionmentioning

confidence: 99%

Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Zhang

Chen

et al. 2023

Advanced Energy Materials

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“…[1][2][3] Owing to recent advancements in high-performance p-type conjugated polymers and n-type nonfullerene acceptor molecules (NFA), [4][5][6] the power conversion efficiency (PCE) of OPVs has signicantly increased to nearly 20%. [7][8][9][10][11] High performance is achieved through efficient photoenergy conversion processes comprising photoabsorption, exciton diffusion, charge separation and charge transport with minimal loss. [12][13][14][15] One of the essential factors in facilitating these multi-physical phenomena is optimising the bulk heterojunction (BHJ) structure of a p/n-blended lm, which is fabricated through a solution process, including a p/n blend ratio, solvent, additive and annealing.…”

Section: Introductionmentioning

confidence: 99%

Machine learning of atomic force microscopy images of organic solar cells

et al. 2023

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“…[1][2][3][4][5][6][7][8][9] Benefiting from the most advanced non-fullerene acceptors, precise morphology manipulation, and interface engineering, the power conversion efficiency (PCE) of OSCs has exceeded 19% with the best fill factors (FF) over 80%, showing their promising application prospects. [10][11][12][13] The ternary blend strategy has been widely used as a practical and straightforward approach to improve the efficiency of OSCs. [14][15][16] By incorporating a third component, the lightharvesting of blend films could be improved, effectively promoting the short-circuit current density (J SC ).…”

Section: Introductionmentioning

confidence: 99%

Improving the efficiency of ternary organic solar cells by reducing energy loss

Wang¹,

Shi²,

Zhang³

et al. 2023

Nanoscale Horiz.

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A 19% efficient and stable organic photovoltaic device enabled by a guest nonfullerene acceptor with fibril-like morphology

Abstract: A nonfullerene acceptor, isoIDITC, capable of exhibiting fibril-like morphology, is utilized as a third component in organic photovoltaics (OPVs). A power conversion efficiency (PCE) of 19% is achieved in ternary...

Cited by 85 publications

References 52 publications

Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Machine learning of atomic force microscopy images of organic solar cells

Improving the efficiency of ternary organic solar cells by reducing energy loss

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