Bis[di(4-methoxyphenyl)amino]carbazole-capped indacenodithiophenes as hole transport materials for highly efficient perovskite solar cells: the pronounced positioning effect of a donor group on the cell performance

Hua, Yong; Chen, Song; Zhang, Dongyang; Xu, Peng; Sun, Anxin; Ou, Yangmei; Wu, Tai; Han-wen, Sun; Cui, Bo; Zhu, Xunjin

doi:10.1039/c9ta01731c

Cited by 32 publications

(21 citation statements)

References 56 publications

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“…However, the complicated synthesis procedures and low yield of Spiro‐OMeTAD make its price very expensive, triggering the researchers over the world to search for/develop efficient and low‐cost alternative HTMs. To date, many alternative HTMs constructed with different conjugated core units, such as phenothiazine, thiophene, phenoxazine, silolothiophene, triazines, and tetraphenylethene, have been reported . Benzotriazole (BTA) is a cheap and commercially available material, which has been widely used in designing sensitizers for dye‐sensitized solar cells by reason of the outstanding electron‐accepting property.…”

Section: Summary Of Optical and Electrochemical Properties Of 2fbta‐1mentioning

confidence: 99%

Fluorine‐Substituted Benzotriazole Core Building Block‐Based Highly Efficient Hole‐Transporting Materials for Mesoporous Perovskite Solar Cells

Chen

et al. 2020

Solar RRL

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Two novel donor–accepter–donor structured hole‐transporting materials based on fluorine‐substituted benzotriazole (BTA) core building blocks (2FBTA‐1 and 2FBTA‐2) are designed and synthesized through molecular regulation. Applying these materials into perovskite solar cells, power conversion efficiencies of 7.55% and 17.94% are obtained for 2FBTA‐1 and 2FBTA‐2, respectively. The better photovoltaic performance of 2FBTA‐2 is attributed to its more suitable energy level, more planar molecular configurations, and higher hole mobility. Moreover, the devices with 2FBTA‐2 as hole transport material (HTM) show good stability in air. The results indicate that BTA is a promising building block for future HTM design.

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Section: Summary Of Optical and Electrochemical Properties Of 2fbta‐1mentioning

confidence: 99%

Fluorine‐Substituted Benzotriazole Core Building Block‐Based Highly Efficient Hole‐Transporting Materials for Mesoporous Perovskite Solar Cells

Chen

et al. 2020

Solar RRL

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“…In contrast, M129 exhibited a much higher hole mobility than that of M128 (4.60×10 −5 cm 2 V −1 s −1 ) and M127 (1.11×10 −4 cm 2 V −1 s −1 ), which means the combination of carbazole and fluorene favors the intermolecular stacking and therefore improves hole‐transporting properties. This observation can be attributed to the strong π stacking as evidenced by absorption spectra measurements (see Figure S18) . The M129 film displays a more bathochromic shift of 20 nm in comparison with its corresponding spectra in solution because of the bulky planar structure, while there is no shift for M130 because of its nonplanar structure (see Figure S19).…”

Section: Figurementioning

confidence: 92%

Indeno[1,2‐b]carbazole as Methoxy‐Free Donor Group: Constructing Efficient and Stable Hole‐Transporting Materials for Perovskite Solar Cells

Wang

Zhang

et al. 2019

Angew Chem Int Ed

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With perovskite‐based solar cells (PSCs) now reaching efficiencies of greater than 20 %, the stability of PSC devices has become a critical challenge for commercialization. However, most efficient hole‐transporting materials (HTMs) thus far still rely on the state‐of‐the‐art methoxy triphenylamine (MOTPA) donor unit in which methoxy groups usually reduce the device stability. Herein, a carbazole‐fluorene hybrid has been employed as a methoxy‐free donor to construct organic HTMs. The indeno[1,2‐b]carbazole group not only inherits the characteristics of carbazole and fluorene, but also exhibits additional advantages arising from the bulky planar structure. Consequently, M129, endowed with indeno[1,2‐b]carbazole simultaneously exhibits a promising efficiency of over 20 % and superior long‐term stability. The hybrid strategy toward the methoxy‐free donor opens a new avenue for developing efficient and stable HTMs.

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“…Spiro‐OMeTAD is famous for high efficiency, but it suffers from high cost and low hole conductivity. Alternative HTMs toward PSCs with an n‐i‐p device structure, small organic compounds, conjugated polymers, porphyrins, and phthalocyanines have been developed.…”

Section: Figurementioning

confidence: 99%

Indeno[1,2‐b]carbazole as Methoxy‐Free Donor Group: Constructing Efficient and Stable Hole‐Transporting Materials for Perovskite Solar Cells

Wang

Zhang

et al. 2019

Angewandte Chemie

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With perovskite-based solar cells (PSCs) now reaching efficiencies of greater than 20 %, the stability of PSC devices has become ac ritical challenge for commercialization. However,m ost efficient hole-transporting materials (HTMs) thus far still rely on the state-of-the-art methoxy triphenylamine (MOTPA) donor unit in whichm ethoxy groups usually reduce the device stability.H erein, ac arbazole-fluorene hybrid has been employed as am ethoxy-free donor to construct organic HTMs.The indeno[1,2-b]carbazole group not only inherits the characteristics of carbazole and fluorene,b ut also exhibits additional advantages arising from the bulky planar structure.Consequently,M129, endowed with indeno[1,2-b]carbazole simultaneously exhibits ap romising efficiency of over 20 %a nd superior long-term stability.T he hybrid strategy toward the methoxy-free donor opens an ew avenue for developing efficient and stable HTMs. Figure 1. Schematic illustration of the molecular design of M127-M129.

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Bis[di(4-methoxyphenyl)amino]carbazole-capped indacenodithiophenes as hole transport materials for highly efficient perovskite solar cells: the pronounced positioning effect of a donor group on the cell performance

Abstract: Two indacenodithiophene-based HTMs have been designed and applied in PSCs. The PSC device based on YK1 displays a very impressive PCE of 20.13%.

Cited by 32 publications

References 56 publications

Fluorine‐Substituted Benzotriazole Core Building Block‐Based Highly Efficient Hole‐Transporting Materials for Mesoporous Perovskite Solar Cells

Fluorine‐Substituted Benzotriazole Core Building Block‐Based Highly Efficient Hole‐Transporting Materials for Mesoporous Perovskite Solar Cells

Indeno[1,2‐b]carbazole as Methoxy‐Free Donor Group: Constructing Efficient and Stable Hole‐Transporting Materials for Perovskite Solar Cells

Indeno[1,2‐b]carbazole as Methoxy‐Free Donor Group: Constructing Efficient and Stable Hole‐Transporting Materials for Perovskite Solar Cells

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