Regulating the reorganization energy and crystal packing of small-molecule donors enables the high performance of binary all-small-molecule organic solar cells with a slow film growth rate

Xu, Tongle; Lv, Jie; Zheng, Daming; Luo, Zhenghui; Jee, Min Hun; Ran, Guangliu; Chen, Zhanxiang; Huang, Zhongyan; Ren, Jiaqi; Li, Yuxiang; Zhang, Cai’e; Hu, Hanlin; Pauporté, Thierry; Zhang, Wenkai; Woo, Han Young; Yang, Chuluo

doi:10.1039/d3ee02129g

Cited by 8 publications

(1 citation statement)

References 66 publications

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“…Uncontrollable nucleation and crystal growth kinetics is one of the important reasons for poor quality of PVK films. It has been widely reported that specific organic salts and additives are very effective in modulating the nucleation and crystal growth rate of PVK films. − In addition, when preparing large-area PVK films, the researchers used phosphonic acid or sulfonic acid molecular additives to regulate the crystal growth rate of PVK and the uniformity of the film. − In the two-step process of a small-area PVK film, the addition of MDPPO to lead iodide changed the morphology of lead iodide, and the organic cation fully reacted with lead iodide (Figure S3). In the large-area PVK film with a one-step method, interaction between MDPPO and PVK promoted the crystallization of PVK (Figures S1 and S2).…”

Section: Resultsmentioning

confidence: 99%

Large-Area Perovskite Solar Modules Based on Uniformity Engineering of Perovskite Films: The Critical Role of Methyldiphenylphosphine Oxide Additive

Han,

Liu,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Perovskite solar cells (PSCs) have led to distinguished achievements and become one of the state-of-the-art photovoltaic technologies. Undoubtedly, reliable preparation of large area high-quality perovskite (PVK) films with uniform optoelectronic properties has become a critical and challenging task to transition PSCs from lab to market. Here, methyldiphenylphosphine oxide (MDPPO) is employed as an additive in a PVK precursor solution to promote uniform conductivity and carrier transport of PVK films. More important, to check its compatibility with the upscaling process, the MDPPO additive strategy was further applied to doctor-blade large-area PVK films. As a result, benefit from the favorable role of MDPPO additive, the power conversion efficiencies (PCEs) of small-area PSCs reach 23.85% with superb open circuit voltage (V oc ) of 1.15 V and fill factor of 81.21%, while an impressive PCE of 19.22% was achieved for the largearea PSC minimodules with active area of 61.48 cm 2 . Remarkably, the MDPPO modified device exhibits significantly improved operational stability, maintaining an initial efficiency of 68% even after 750 h under continuous 1-sun illumination. Our achievements will provide profound insight and further guidance for the scale-up process of PSCs from lab to large-scale modules.

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Section: Resultsmentioning

confidence: 99%

Large-Area Perovskite Solar Modules Based on Uniformity Engineering of Perovskite Films: The Critical Role of Methyldiphenylphosphine Oxide Additive

Han,

Liu,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Achieving 19.5% Efficiency via Modulating Electronic Properties of Peripheral Aryl‐Substituted Small‐Molecule Acceptors

Xu,

Ran,

Luo

et al. 2024

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The advancement of acceptors plays a pivotal role in determining photovoltaic performance. While previous efforts have focused on optimizing acceptor–donor–acceptor1–donor–acceptor (A–DA1–D–A)‐typed acceptors by adjusting side chains, end groups, and conjugated extension of the electron‐deficient central A1 unit, the systematic exploration of the impact of peripheral aryl substitutions, particularly with different electron groups, on the A1 unit and its influence on device performance is still lacking. In this study, three novel acceptors – QxTh, QxPh, and QxPy – with distinct substitutions on the quinoxaline (Qx) are designed and synthesized. Density functional theory (DFT) analyses reveal that QxPh, featuring a phenyl‐substituted Qx, exhibits the smallest molecular binding energies and a tightest π···π stacking distance. Consequently, the PM6:QxPh device demonstrates a better power conversion efficiency (PCE) of 17.1% compared to the blends incorporating QxTh (16.4%) and QxPy (15.7%). This enhancement is primarily attributed to suppressed charge recombination, improved charge extraction, and more favorable molecular stacking and morphology. Importantly, introducing QxPh as a guest acceptor into the PM6:BTP‐eC9 binary system yields an outstanding PCE of 19.5%, indicating the substantial potential of QxPh in advancing ternary device performance. The work provides deep insights into the expansion of high‐performance organic photovoltaic materials through peripheral aryl substitution strategy.

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Development of cross-linked donor polymers for polymer solar cells with improved efficiency and thermal stability

Wang,

et al. 2024

Chemical Engineering Journal

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Regulating the reorganization energy and crystal packing of small-molecule donors enables the high performance of binary all-small-molecule organic solar cells with a slow film growth rate

Abstract: Difficulty in tuning the ideal phase morphology of interpenetrating network structures is the main reason for the relative inefficiency of all-small-molecule organic solar cells (ASM-OSCs). Achieving a desirable phase morphology...

Cited by 8 publications

References 66 publications

Large-Area Perovskite Solar Modules Based on Uniformity Engineering of Perovskite Films: The Critical Role of Methyldiphenylphosphine Oxide Additive

Large-Area Perovskite Solar Modules Based on Uniformity Engineering of Perovskite Films: The Critical Role of Methyldiphenylphosphine Oxide Additive

Achieving 19.5% Efficiency via Modulating Electronic Properties of Peripheral Aryl‐Substituted Small‐Molecule Acceptors

Development of cross-linked donor polymers for polymer solar cells with improved efficiency and thermal stability

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