A triple helicene based molecular semiconductor characteristic of a fully fused conjugated backbone for perovskite solar cells

Fang, Lingyi; Zhang, Yuyan; Ren, Ming; Xie, Xinrui; Li, Tianyu; Yuan, Yi; Zhang, Jing; Wang, Peng

doi:10.1039/d1ee02843j

Cited by 33 publications

(37 citation statements)

References 64 publications

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“…Perovskite solar cells (PSCs) have emerged as a promising candidate for the next-generation commercialized photovoltaic (PV) technology due to their excellent photoelectric performance. − In the past decade, organic − and polymeric − hole transport materials (HTMs) have been extensively studied because they play an important role in efficient charge transport. So far, spiro-type HTMs such as Spiro-OMeTAD are the most widely used organic HTMs for n-i-p PSCs .…”

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confidence: 99%

Conjugation Engineering of Spiro-Based Hole Transport Materials for Efficient and Stable Perovskite Solar Cells

Sun

et al. 2022

ACS Energy Lett.

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The spiro-type hole transport materials (HTMs) highly depend on the dopants, which increase the hygroscopicity and damage the stability of perovskite solar cells (PSCs). Herein we propose an effective linearization strategy and conjugate engineering modulation to improve the hole mobility and hydrophobicity of spiro-type HTMs. It is found that the spiro-type HTMs with a larger conjugation unit outperforms the short ones with respect to the power conversion efficiency (PCE) and long-term stability, regardless of whether or not the dopants are used. Due to good hole transport and film formation properties, the doped M6-F exhibits high efficiency in both large-area (1.01 cm2, 20.31%) and small-area (0.1 cm2, 22.17%) devices. Moreover, a PSC based on dopant-free M6-F yields an efficiency of 21.21% (stabilized PCE is 20.59%). This work provides a rational and effective way to break the bottleneck of developing spiro-type HTMs.

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confidence: 99%

Conjugation Engineering of Spiro-Based Hole Transport Materials for Efficient and Stable Perovskite Solar Cells

Sun

et al. 2022

ACS Energy Lett.

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“…A large rigid p-conjugated system can enhance intermolecular p-p interaction, leading to high charge transport capability. 115,116 In 2021, Yang's group synthesized an efficient carbazole-based dopant-free HTM via a facile FeCl 3 catalysis ring-closing reaction for the first time. 117 Compared with C301, the hole mobility of C302 increased from 5.7 Â 10 À5 to 5.7 Â 10 À4 cm 2 V À1 s À1 owing to an improved p-conjugated degree.…”

Section: Conventional (N-i-p) Pscsmentioning

confidence: 99%

Recent advances in dopant-free organic hole-transporting materials for efficient, stable and low-cost perovskite solar cells

Yan

Yang

Wang

et al. 2022

Energy Environ. Sci.

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“…18,19 By further rigidifying the helicene rings with a pyrrole bridge, two molecular semiconductors (DOP-OMeDPA and TBPC-611) based on the bis(oxa [5]helicene) and triple aza [5]helicene are synthesized, and solution-processed film shows a better morphology stability due to its unique helical conformation. 22,23 The PSCs fabricated with the two HTMs deliver high efficiencies of over 22% and long-term device stability at 85 °C. 22,23 To sum up, the helical core configuration has a great potential for developing the highly efficient HTMs.…”

Section: Introductionmentioning

confidence: 99%

Structural Engineering of FDT toward Promising Spiro-Typed Hole-Transporting Materials: Promoting the Hole Transport and Stabilizing the HOMO Levels

et al. 2022

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Design of a new spiro-typed core structure is one of the most important approaches for developing highly efficient hole-transporting materials (HTMs). In this work, the strategies of modifying with O/S heteroatoms and introducing a helical π-linker are evaluated based on the typical FDT molecule. Theoretical calculations show that all the highest occupied molecular orbitals (HOMOs) and the lowest unoccupied molecular orbitals (LUMOs) of the studied HTMs are matched well with the energy band structure of perovskite, and the HOMO levels display a gradually negative-shifted trend from the FDT to SM30, which means that the favorable hole extraction and the easy interfacial energy regulation can be anticipated. Compared to the light absorption of the FDT, the absorption spectra of new tailored HTMs are slightly red-shifted. More importantly, our results indicate that introducing a helical π-linker and modification with heteroatoms in the spiro-typed core can be the effective methods to promote the hole transport ability of HTMs. Both the methods can effectually heighten the crystal stacking and intermolecular electronic couplings and further facilitate the hole transport of HTMs. Furthermore, the large Stokes shifts and the better solubility are also displayed for the newly tailored HTMs. In sum, this work provides useful insights for the design of highly efficient HTMs, and three new spiro-typed HTMs are proposed.

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A triple helicene based molecular semiconductor characteristic of a fully fused conjugated backbone for perovskite solar cells

Abstract: Ionic organic-inorganic hybrid lead halide perovskites are prone to degrade at elevated temperatures, especially in the presence of water moisture. This grand challenge heavily impedes the outdoor application of high-efficiency...

Cited by 33 publications

References 64 publications

Conjugation Engineering of Spiro-Based Hole Transport Materials for Efficient and Stable Perovskite Solar Cells

Conjugation Engineering of Spiro-Based Hole Transport Materials for Efficient and Stable Perovskite Solar Cells

Recent advances in dopant-free organic hole-transporting materials for efficient, stable and low-cost perovskite solar cells

Structural Engineering of FDT toward Promising Spiro-Typed Hole-Transporting Materials: Promoting the Hole Transport and Stabilizing the HOMO Levels

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