Two methoxyaniline-substituted dibenzofuran derivatives as hole-transport materials for perovskite solar cells

Shi, Yantao; Hou, Kaili; Wang, Yanxiang; Wang, Kai; Ren, Huicai; Pang, MaoYin; Chen, Fan; Zhang, Sen

doi:10.1039/c6ta00976j

Cited by 58 publications

(34 citation statements)

References 33 publications

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“…Slow kinetic processes,s uch as charge transport or interfacials eparation, are reported to lead to pronounced hysteresis. [35] The hysteresis of the devicec ontaining IDTT-TPA was less pronounced, which could be ascribed to its higherh ole mobility that facilities hole transport. To determine the devices reliability,t he stabilized efficiency was measured at ac onstant bias near the Figures 5c,d).…”

Section: Resultsmentioning

confidence: 98%

“…The differences in the PCEs between the forward and reverse scans were 14 % and 23 % for the devices containing IDTT–TPA and IDT–TPA , respectively (Table ). Slow kinetic processes, such as charge transport or interfacial separation, are reported to lead to pronounced hysteresis . The hysteresis of the device containing IDTT–TPA was less pronounced, which could be ascribed to its higher hole mobility that facilities hole transport.…”

Section: Resultsmentioning

confidence: 99%

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Dopant‐Free Hole‐Transport Materials Based on Methoxytriphenylamine‐Substituted Indacenodithienothiophene for Solution‐Processed Perovskite Solar Cells

et al. 2017

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Solution-processed hole transporting materials (HTMs) that are dopant-free show promise for use in low-cost, high-performance perovskite solar cells (PSCs). The highest-efficiency PSCs use organic HTMs, many of which have low mobilities and therefore require doping, which lowers the device stability. Additionally, these materials are not easily scaled because they often require complicated synthesis. Two new HTMs (IDT-TPA and IDTT-TPA) were synthesized, which contained either an extended fused-ring indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) core and strong electron-donating methoxytriphenylamine (TPA) groups as the end-capping units. The extended conjugation in the backbone of IDTT-TPA resulted in stronger π-π interactions (3.321 Å) and a higher hole mobility of 6.46×10 cm V s when compared with that of IDT-TPA (9.53×10 cm V s ). A dopant-free, planar PSC that contained IDTT-TPA was fabricated and exhibited a high power conversion efficiency (PCE) of 15.7 %. This cell exhibited a higher PCE and less hysteresis than devices that contained IDT-TPA.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Dopant‐Free Hole‐Transport Materials Based on Methoxytriphenylamine‐Substituted Indacenodithienothiophene for Solution‐Processed Perovskite Solar Cells

et al. 2017

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“…The carbazole derivatives modified with 4,4′‐dimethoxydiphenylamine were synthesized according to our previously reported methods . F22 and F33 were synthesized through a palladium‐catalyzed Buchwald–Hartwig crosscoupling reaction . X51 was synthesized according to a literature report .…”

Section: Resultsmentioning

confidence: 99%

Replacement of Biphenyl by Bipyridine Enabling Powerful Hole Transport Materials for Efficient Perovskite Solar Cells

Shan

Qiao

et al. 2017

ChemSusChem

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Here, 2,2′‐ and 3,3′‐bipyridine are introduced for the first time as the core structure to get two new hole transport materials (HTMs), namely F22 and F33. The electron‐withdrawing nature of bipyridine lowers the HOMO level of the new compounds and enhances the open‐circuit voltage of perovskite solar cells. Especially for F33, the better planarity leads to better conjugation in the whole molecule and the molecular interaction is enhanced. Hole‐mobility tests, steady‐state photoluminescence (PL) spectra as well as time‐resolved PL decay results demonstrate that the new HTMs exhibit good hole extraction and hole‐transporting property. Impressive power conversion efficiencies of 17.71 and 18.48 % are achieved in conventional planar perovskite (CH3NH3PbI3−xClx) solar cells containing F22 and F33 as HTMs, respectively. As far as we know, this is the first report on bypiridine‐based HTMs with leading efficiencies, and the design motif in this work opens a new way for devising HTMs in the future.

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“…Evidently, the conventional TiO 2 compact film of ca. 60 nm in thickness [30] has an inferior conductivity as indicated by the curve slope. In contrast, a better conductive feature of SnO 2 is well reflected by the sample of SnO 2 -0.500 mol L -1 since it outputs larger current under the same bias voltage.…”

Section: Resultsmentioning

confidence: 99%

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

et al. 2017

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Here, the interfacial synergism of discontinuous spot shaped SnO 2 and TiO 2 mesoporous nanocomposite as electron transfer layer (ETL) underlayer is presented in highly efficient mesoscopic perovskite solar cells (M-PSCs). Based on this new strategy, strong charge recombination observed in previous SnO 2 -based ETLs is suppressed to a great extent as the pathways of charge recombination and energy loss are blocked effectively. Meanwhile, the internal series resistance of entire M-PSC is decreased remarkably. The new ETL is more kinetically favorable to electron transfer and thus results in significant photovoltaic improvement and alleviated hysteresis effect of M-PSCs.

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Two methoxyaniline-substituted dibenzofuran derivatives as hole-transport materials for perovskite solar cells

Abstract: Two low-cost methoxyaniline-substituted dibenzofuran derivatives were synthesized and used as hole-transport materials for efficient perovskite solar cells.

Cited by 58 publications

References 33 publications

Dopant‐Free Hole‐Transport Materials Based on Methoxytriphenylamine‐Substituted Indacenodithienothiophene for Solution‐Processed Perovskite Solar Cells

Dopant‐Free Hole‐Transport Materials Based on Methoxytriphenylamine‐Substituted Indacenodithienothiophene for Solution‐Processed Perovskite Solar Cells

Replacement of Biphenyl by Bipyridine Enabling Powerful Hole Transport Materials for Efficient Perovskite Solar Cells

Rational design of SnO2-based electron transport layer in mesoscopic perovskite solar cells: more kinetically favorable than traditional double-layer architecture

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