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

Liu, Xiaoyuan; Wang, Yulong; Chen, Zhiliang; Yao, Fang; Zhang, Qi; Fang, Guojia; Chen, Zhi-Kuan; Huang, Wei; Xu, Zong‐Xiang

doi:10.1002/cssc.201700197

Cited by 44 publications

(26 citation statements)

References 35 publications

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“…Herein, the central cores based on fluorene‐bridge‐benzene unit (FB) and fluorene‐bridge‐thiophene unit (FT) were coupled with triarylamine groups (TPA), a kind of popular functional group for efficient hole transport in PVSCs . Our HTMs, namely, FB‐OMeTPA and FT‐OMeTPA, require only two step synthesis; therefore, the design synthesis is facile and low cost compared with most of the HTM molecules.…”

Section: Methodsmentioning

confidence: 99%

Dopant‐Free Hole Transporting Molecules for Highly Efficient Perovskite Photovoltaic with Strong Interfacial Interaction

Meng

Wang

et al. 2019

Solar RRL

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One of the attractive ways to develop efficient and cost-effective inverted perovskite solar cells (PVSCs) is through the use of dopant-free hole transporting materials (HTMs) with facile synthesis and a lower price tag. Herein, two organic small molecules with a fluorene core are presented as dopant-free HTMs in inverted PVSCs, namely, FB-OMeTPA and FT-OMeTPA. The two molecules are designed in such a way they differ by replacing one of the benzene rings (FB-OMeTPA) with thiophene (FT-OMeTPA), which leads to a significantly improved coplanarity as manifested in the redshift of the absorbance and a smaller bandgap energy. Density functional theory calculations show that FT-OMeTPA has a strong Pb 2þ -S interaction at the FT-OMeTPA/perovskite interface, allowing surface passivation and facilitating charge transfer across interfaces. As a result, the PVSCs based on FT-OMeTPA exhibit a much higher hole mobility, power conversion efficiency, operational stability, and less hysteresis as compared with devices based on FB-OMeTPA.It is exciting that the power conversion efficiency (PCE) of hybrid organic-inorganic halide perovskite solar cells (PVSCs) has grown from 3.8% [1] to 25.2% [2] in the last decade. In contrast to the inorganic silicon solar cells, hybrid PVSCs are lightweighted, processible at low temperature, and have tunable electronic and optical properties. [3,4] Worth noting that high PCE over 20% can usually be achieved by the normal (n-i-p) configuration via inserting a hole transporting layer (HTL) between perovskite and metal electrode. [2,[5][6][7][8][9] The most popular HTL in this configuration is 2,2 0 ,7,7 0 -tetrakis (N,N-di-methoxyphenyl-amine) 9,9-spirobifluorene (Spiro-OMeTAD); however, Spiro-OMeTAD requires additional chemical doping and oxidation process to achieve better conductivity and energy level match, leading to a complicate fabrication process. [10][11][12] Besides, the hydrophilic dopants can bring in the degradation issues, which have negative impacts on the stability of PVSCs. [13][14][15] Therefore, much effort has been devoted to develop dopant-free hole transporting materials (HTMs) applied in either normal or inverted (p-i-n) PVSCs (e.g., transparent conductive substrate/HTL/perovskite/electron

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Section: Methodsmentioning

confidence: 99%

Dopant‐Free Hole Transporting Molecules for Highly Efficient Perovskite Photovoltaic with Strong Interfacial Interaction

Meng

Wang

et al. 2019

Solar RRL

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“…To avoid this trade‐off between photovoltaic properties and long‐term stability and to circumvent the tight control of doping level and oxidation duration in the fabrication procedure, numerous dopant‐free HTMs including small molecules and conjugated polymers have been vigorously explored, and the exploration mainly focused on the following three characteristics of HTMs: 1) long‐term stability when exposed to air, 2) suitable frontier energy levels matching that of perovskite layer, and 3) a high intrinsic hole mobility to deliver the photogenerated holes to the electrode. Generally, an HTM without any dopants could easily meet the former two requirements with proper frontier energy levels via engineering the side‐chain, finely tuning the position of functional groups and/or substituting atoms in the aromatic rings .…”

Section: Photovoltaic Properties Of the Optimized Pscs Based On Dtb Amentioning

confidence: 99%

Intensive Exposure of Functional Rings of a Polymeric Hole‐Transporting Material Enables Efficient Perovskite Solar Cells

et al. 2018

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A variety of dopant-free hole-transporting materials (HTMs) is effectively applied in perovskite solar cells (PSCs); however, HTMs with the additional function of HTM/perovskite interfacial optimization that is crucial to their photovoltaic performance are really limited. In this work, the design of an HTM bearing an intensive exposure of its functional aromatic rings to perovskite layer via side-chain engineering is attempted. With an edge-on orientation and a short distance to perovskite, this HTM was expected to display an excellent ability to extract holes from and passivate defects in the perovskite layer. To demonstrate this strategy, an alternating copolymer was constructed with a 2,5-di-2-ethylhexyloxy-1,4-phenylene unit and a bithiophene unit, and the PSC based on this polymer showed an ultrahigh short-circuit current density of 25.50 mA cm , which was the highest so far presented by dopant-free organic HTMs. A comparable power conversion efficiency of 19.68% (certified: 19.5%) to that of a control 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) device (19.81%) was thus obtained, which is the highest value ever reported for mesoporous PSCs based on dopant-free polymeric HTMs.

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“…In 2017, Liu et al designed new dopant‐free, solution processed triphenylamine based HTMs for use in low cost, high performance PSCs . A PCE of as high as 15.7% was achieved for a PSC based on IDTT‐TPA ( 61 ) as HTM without adding any dopants.…”

Section: Dopant‐free Hole Transporting Materials For Pscsmentioning

confidence: 99%

Dopant‐Free Hole Transporting Materials for Perovskite Solar Cells

Rezaee

Liu

et al. 2018

Solar RRL

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This article reviews various dopant-free hole transporting materials (HTMs) used in perovskite solar cells (PSCs) in three main categories including inorganic, polymeric, and small molecule HTMs. PSCs have undergone rapid progress, achieving power conversion efficiencies (PCEs) above 22%. With their low production cost and high efficiencies, PSCs are considered promising next-generation solar cell technology. In all developed architectures for PSCs, including planar and mesoscopic with conventional and inverted structures, HTMs play a significant role in determining the photovoltaic performance of PSCs. Using p-type dopants, however, is considered a common strategy to increase the hole conductivity of HTM, which is usually compensated by a more complicated fabrication procedure, higher production costs, and lower stability of PSC. Although several reviews on HTMs have been published, progress on dopant free HTMs needs to be reviewed and analyzed. Here, a review covering most of the published reports on dopantfree HTMs is presented, and the device structure and fabrication method, HTM layer deposition techniques, and the efficiency and the stability of PSCs are addressed during discussions in each main category. Finally, an outlook on stability and PCE growth in PSCs based on dopant-free HTMs is presented.

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

Cited by 44 publications

References 35 publications

Dopant‐Free Hole Transporting Molecules for Highly Efficient Perovskite Photovoltaic with Strong Interfacial Interaction

Dopant‐Free Hole Transporting Molecules for Highly Efficient Perovskite Photovoltaic with Strong Interfacial Interaction

Intensive Exposure of Functional Rings of a Polymeric Hole‐Transporting Material Enables Efficient Perovskite Solar Cells

Dopant‐Free Hole Transporting Materials for Perovskite Solar Cells

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