A <i>N</i>‐Ethylcarbazole‐Terminated Spiro‐Type Hole‐Transporting Material for Efficient and Stable Perovskite Solar Cells

Han, Mingyuan; Liang, Yongpeng; Chen, Jianin; Zhang, Xianfu; Ghadari, Rahim; Liu, Xuepeng; Wu, Nan; Zhou, Ying; Ding, Yong; Chen, Haibin; Dai, Songyuan

doi:10.1002/cssc.202201485

Cited by 9 publications

(4 citation statements)

References 56 publications

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“…21 While efforts have been made to develop new HTMs that incorporate SBF and other electron-donors, their overall quality factors including filmforming properties, energy levels, hole conduction, and glass transition are not entirely satisfactory. [22][23][24][25][26][27][28] For instance, Jeon et al 29 introduced a novel SBF based HTM with the electrondonor methoxyphenylfluorenamine for 60 1C thermostable perovskite solar cells, denoted as DM and is illustrated in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Spirobifluorene with an asymmetric fluorenylcarbazolamine electron-donor as the hole transport material increases thermostability and efficiency of perovskite solar cells

Ren

Wei

et al. 2023

Energy Environ. Sci.

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Section: Introductionmentioning

confidence: 99%

Spirobifluorene with an asymmetric fluorenylcarbazolamine electron-donor as the hole transport material increases thermostability and efficiency of perovskite solar cells

Ren

Wei

et al. 2023

Energy Environ. Sci.

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“…Simultaneously, the LUMO energy levels possessed by ThPCyAc molecules and spiro-OMeTAD rise above the conduction band in the perovskite, imposing restrictions against electrons while promoting favorable charge-transfer modes . Differential scanning calorimetric (DSC) analysis on ThPCyAc material reveals glass transition temperature ( T g ) situated at 121 °C (Figure d), nearly equivalent to that of reference spiro-OMeTAD. − More impressively, ThPCyAc demonstrates melting point ( T m ) approaching 288 °C, indicating superior thermal properties, rendering unfavorable molecular deformation or decomposition events unlikely.…”

Section: Results and Discussionmentioning

confidence: 97%

A Multifunctional Dye Molecule as the Interfacial Layer for Perovskite Solar Cells

Chen,

Zhang,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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In perovskite solar cells (PSCs), defects in the interface and mismatched energy levels can damage the device performance. Improving the interface quality is an effective way to achieve efficient and stable PSCs. In this work, a multifunctional dye molecule, named ThPCyAc, was designed and synthesized to be introduced in the perovskite/HTM interface. On one hand, various functional groups on the acceptor unit can act as Lewis base to reduce defect density and suppress nonradiative combinations. On the other hand, the stepwise energy-level alignment caused by ThPCyAc decreases the accumulation of interface carriers for facilitating charge extraction and transmission. Therefore, based on the ThPCyAc molecule, the devices exhibit elevated open-circuit voltage and fill factor, resulting in the best power conversion efficiency (PCE) of 23.16%, outperforming the control sample lacking the interface layer (PCE = 21.49%). Excitingly, when attempting to apply it as a self-assembled layer in inverted devices, ThPCyAc still exhibits attractive behavior. It is worth noting that these results indicate that dye molecules have great potential in developing multifunctional interface materials to obtain higher-performance PSCs.

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“…The substitution of the four methoxyphenyl terminal groups with N ‐ethylcarbazole has been reported also from another research group, but attached in another position compared to V1267 . [ 26 ] Indeed, the spiro‐carbazole displays the N ‐ethylcarbazole attached in position 2 to the core, whereas in V1267 the same substituent is linked in position 3 to the spirobifluorene. The HTM exhibits an improvement of the PCE of PSCs with n–i–p (conventional) architecture up to 22.01% compared to the reference spiro‐OMeTAD (21.12%), thus slightly better than the aforementioned regioisomer.…”

Section: Beyond Spiro‐ometad's Limitationsmentioning

confidence: 99%

The Future of Spirobifluorene‐Based Molecules as Hole‐Transporting Materials for Solar Cells

Vaghi

Rizzo

2023

Solar RRL

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Renewable energy appears as one of the fundamental points to establish a sustainable society in the next future throughout the production of eco-friendly electricity. Among the renewable resources of energy, solar energy appears as the most abundant, well worldwide distributed and unlimited source of energy. Solar cells, that is, devices, able to convert solar energy into electricity have been developed since longtime. Crystalline Si-based solar cells are the most commercially diffused technologies, showing with the highest power conversion efficiency (PCE) of 26.6%. [1] The cost of the production of Si-based solar cells is significantly reduced in recent years, however, new technologies are necessary to produce solar cells at even lower costs with lower environmental impact. Next-generation technologies, such as dye-sensitized solar cells, quantum dot solar cells, and organic solar cells (OSCs), have emerged in the last decades to replace cost-effective Si-based solar cells. However, their PCEs and long-term stability are still lower than Si-based solar cells, even if the hybrid perovskite solar cells (PSCs) exhibit a continuous improvement in the recent years. [2] The emerging photovoltaic devices are generally made by multilayers structure, so their efficiency can be improved by acting on every material used on the different layers. In addition to the active layer, which incorporates the material collecting the solar radiation, the charge transport layers are pivotal on the photovoltaic performance. Indeed, hole-and electron-transporting layers (HTL and ETL) transfer the separated charge carriers at the electrodes by avoiding the recombination inside the device. In OSCs, hole-transport materials (HTMs) have usually polymeric nature, such as the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), but the use of small molecules is increasing due to their chemical versatility and easiest synthesis. Noteworthy, the most used polymeric HTM PEDOT:PSS suffers of instability and induces corrosion on electrodes due to its acidity.Among the small-molecule HTMs, 2,2 0 ,7,7 0 -tetrakis-(N,N-di-4-methoxyphenylamino)-9,9 0 -spirobifluorene (spiro-OMeTAD) (Figure 1) emerged as the most widely used small molecule in organic photovoltaic devices, first as solid electrolyte in dyesensitized solar cells [3] and later in PSCs. [4] The pivotal role of spiro-OMeTAD in PSCs is underlined by the impressive certified

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A N‐Ethylcarbazole‐Terminated Spiro‐Type Hole‐Transporting Material for Efficient and Stable Perovskite Solar Cells

Cited by 9 publications

References 56 publications

Spirobifluorene with an asymmetric fluorenylcarbazolamine electron-donor as the hole transport material increases thermostability and efficiency of perovskite solar cells

Spirobifluorene with an asymmetric fluorenylcarbazolamine electron-donor as the hole transport material increases thermostability and efficiency of perovskite solar cells

A Multifunctional Dye Molecule as the Interfacial Layer for Perovskite Solar Cells

The Future of Spirobifluorene‐Based Molecules as Hole‐Transporting Materials for Solar Cells

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