Introduction of Fluorine Into spiro[fluorene‐9,9′‐xanthene]‐Based Hole Transport Material to Obtain Sensitive‐Dopant‐Free, High Efficient and Stable Perovskite Solar Cells

Guo, Kunpeng; Wu, Min; Yang, Song; Wang, Zongtao; Li, Jie; Liang, Xiaozhong; Zhang, Fang; Liu, Zhike; Wang, Zhongqiang

doi:10.1002/solr.201800352

Cited by 43 publications

(28 citation statements)

References 44 publications

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“…Both τ 1 and τ 2 of the perovskite (DFPDA)/Spiro‐OMeTAD sample are faster than those of the bare perovskite/Spiro‐OMeTAD, suggesting a faster photo‐induced hole transfer from the perovskite to the Spiro‐OMeTAD with DFPDA treatment. [ 37 ] The improved carrier dynamics at the interface originate from the effective surface doping effect of the DFPDA, which will be discussed later.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Enhancement for Highly Stable and Efficient Perovskite Solar Cells

Cai

Cui

Chen

et al. 2020

Adv Funct Materials

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298

273

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With a certified efficiency as high as 25.2%, perovskite has taken the crown as the highest efficiency thin film solar cell material. Unfortunately, serious instability issues must be resolved before perovskite solar cells (PSCs) are commercialized. Aided by theoretical calculation, an appropriate multifunctional molecule, 2,2‐difluoropropanediamide (DFPDA), is selected to ameliorate all the instability issues. Specifically, the carbonyl groups in DFPDA form chemical bonds with Pb2+ and passivate under‐coordinated Pb2+ defects. Consequently, the perovskite crystallization rate is reduced and high‐quality films are produced with fewer defects. The amino groups not only bind with iodide to suppress ion migration but also increase the electron density on the carbonyl groups to further enhance their passivation effect. Furthermore, the fluorine groups in DFPDA form both an effective barrier on the perovskite to improve its moisture stability and a bridge between the perovskite and HTL for effective charge transport. In addition, they show an effective doping effect in the HTL to improve its carrier mobility. With the help of the combined effects of these groups in DFPDA, the PSCs with DFPDA additive achieve a champion efficiency of 22.21% and a substantially improved stability against moisture, heat, and light.

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Section: Resultsmentioning

confidence: 99%

Multifunctional Enhancement for Highly Stable and Efficient Perovskite Solar Cells

Cai

Cui

Chen

et al. 2020

Adv Funct Materials

Self Cite

298

273

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“…Abdellah 等 [71] [72] 由于分子几何形状的空间位阻效应, 吡啶氮原子很容易钝化钙钛矿薄膜表面的 Pb 2+ 形成强化学键, Xu 等 [73] [73] Figure 11 DFT calculation of the chemically bonded binding energy level between XOP, XMP, XPP and the exposed Pb atoms in perovskite crystal [73] HOMO 能级、促进电荷输运等性能的一种分子设计策略 [75] . Guo 等 [76] 设计并低成本合成了 2mF-X59, 与 spiro-OMeTAD (HOMO: -5.13 eV)相比, 2mF-X59 具有略低的 HOMO 能级(-5.14 eV), 同时具有良好的空穴迁移率和疏水性(如图 12).…”

Section: 螺[芴-99′-氧杂蒽]的合成unclassified

Research Progress of Hole Transport Materials Based on Spiro Aromatic-Skeleton in Perovskite Solar Cells

Liu¹,

Ren²,

Sun³

et al. 2021

Acta Chimica Sinica

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The third-generation energy electro-optical technology, perovskite solar cells (PSCs), have risen fast over the past decade. In view of the characteristic of intrinsic-semiconductor of organic-inorganic hybrid perovskite materials, as well as the multilayer planar architecture of PSC devices, the hole transport materials (HTMs) based on organic small molecules were introduced PSCs to make up of p-type layer, by which not only full-solid state PSCs were established, but also the highly efficient and stable PSC devices were attained. Currently, spiro-OMeTAD (2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene) is still used as an universal benchmark material in the hole-transporting layer of PSCs, meanwhile the researches have make great effort to analyze and to improve the spiro-OMeTAD. For the prevailing molecule, the three-dimensional core of spirofluorene (SBF) offers a platform to integrate more hole-transporting units with less occupied space, and arylamine groups act as high electroactivity units due to their excellent p-type property. However, the classical SBF core has two major drawbacks: expensive preparation cost and monotonous modification positions, therefore the improvement orientation of spiro-OMeTAD is focused on the arylamine moieties. Along with the developments of molecular design of HTMs and corresponding synthetic methodology, a series of SBF-like aromatic-skeletons have been springing up and stepping into the field of HTMs in recent five years, e.g. spiro[fluorene-9,9′-xanthene], spiroacridine, spirothioxanthene and so on. These advancements expand the design space of HTM molecules, and enhance the efficiency and stability of PSCs. In consequence, we put eyes on the HTMs containing spiro aromatic-skeleton, and seek the structure elements of highly efficient materials. In this review, the high performance HTMs have been classified and summarized according to the type of spiro structure, further, their design solution and structure-performance relationship have also been refined. It is expected that the summarization and condensation would provide valuable strategies for HTMs design and promote the devel-

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“…Thus, the preparation of new organic HTMs with low cost, easy‐to‐synthesis, and high mobility is still an essential task to promote the development of PSCs. [ 14–18 ]…”

Section: Introductionmentioning

confidence: 99%

Hole‐Transporting Molecules with Tetrabenzo[a,c,g,i]carbazole Core for Highly Efficient Perovskite Solar Cells

Liu

Ling

et al. 2021

Solar RRL

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Hole‐transporting materials (HTMs) are the key component of perovskite solar cells (PSCs) for the role of extracting photogenerated holes, as well as the charge transporting between perovskite layer and metal electrode. Herein, with the aim to enhance the hole mobility by compact molecular packing, the modification of HTMs focuses on the extension of conjugated cores from the commonly used carbazole (Cz) to tetrabenzo[a,c,g,i]carbazole (TBC). Because of the closely cofacial stacking mode of the TBC core with an X‐type symmetric structure, the resultant TBC‐2,7,11,16‐tetra‐diphenylamine (TD) can achieve a hole mobility of 6.6 × 10−4 cm2 V−1 s−1 and the corresponding conversion efficiency of 20.52%, higher than that of the analogue Cz‐TD (18.34%).

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Introduction of Fluorine Into spiro[fluorene‐9,9′‐xanthene]‐Based Hole Transport Material to Obtain Sensitive‐Dopant‐Free, High Efficient and Stable Perovskite Solar Cells

Cited by 43 publications

References 44 publications

Multifunctional Enhancement for Highly Stable and Efficient Perovskite Solar Cells

Multifunctional Enhancement for Highly Stable and Efficient Perovskite Solar Cells

Research Progress of Hole Transport Materials Based on Spiro Aromatic-Skeleton in Perovskite Solar Cells

Hole‐Transporting Molecules with Tetrabenzo[a,c,g,i]carbazole Core for Highly Efficient Perovskite Solar Cells

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