Decorating hole transport material with −CF3 groups for highly efficient and stable perovskite solar cells

Li, Bin; Cai, Yuan; Xia, Tian; Liang, Xiaozhong; Li, Da; Zhang, Zheng; Wang, Sijing; Guo, Kunpeng; Liu, Zhike

doi:10.1016/j.jechem.2021.04.017

Cited by 18 publications

(20 citation statements)

References 52 publications

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“…After calibrating oxidized potentials with ferrocene, the HOMO level of Spiro‐4TFETAD was −5.25 eV, which is lower than that of Spiro‐OMeTAD (−5.19 eV) because of the electron‐withdrawing capability of trifluoroethoxy groups. [ 26,30,32 ] The deeper HOMO level of Spiro‐4TFETAD was closer with the valence band (VB) of (FAPbI 3 ) 0.97 (MAPbBr 3 ) 0.03 perovskite (−5.80 eV), indicating that less energy loss occurred during hole transfer, and therefore would lead to a higher V OC in the corresponding PSC. [ 27 ] The LUMO levels of Spiro‐4TFETAD and Spiro‐OMeTAD were −2.35 and −2.32 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…[12,26,28] In addition, fluorination of materials is beneficial for the improvement of hydrophobicity, tuning of energy levels, and facilitation of charge transport. [18,[29][30][31][32][33][34] It has also demonstrated that fluorine substitution on interfacial materials is beneficial for improving phase stability and decreasing structural defects of perovskite. [35] Based on these data, the modification of DOI: 10.1002/solr.202100944…”

Section: Introductionmentioning

confidence: 99%

“…[ 12,26,28 ] In addition, fluorination of materials is beneficial for the improvement of hydrophobicity, tuning of energy levels, and facilitation of charge transport. [ 18,29–34 ] It has also demonstrated that fluorine substitution on interfacial materials is beneficial for improving phase stability and decreasing structural defects of perovskite. [ 35 ] Based on these data, the modification of Spiro‐OMeTAD with a reasonable substituent, which is composed of alkoxyl and fluorine‐containing groups, is hypothesized to achieve new HTMs with desired properties to realize high PCE and stability in PSCs.…”

Section: Introductionmentioning

confidence: 99%

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A Trifluoroethoxyl Functionalized Spiro‐Based Hole‐Transporting Material for Highly Efficient and Stable Perovskite Solar Cells

Zhang

Yuan

et al. 2021

Solar RRL

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It is crucial to finely optimize the properties of hole transport materials (HTMs) to improve the performance and stability of perovskite solar cells (PSCs). Herein, a new spiro‐based HTM (Spiro‐4TFETAD) is developed by replacement of partial methoxy groups in Spiro‐OMeTAD with trifluoroethoxy substituents. Spiro‐4TFETAD has lower highest occupied molecular orbital level, higher thermal stability (Tg = 140 °C), hole mobility (2.04 × 10−4 cm2 V−1 s−1), and better hydrophobicity with respect to Spiro‐OMeTAD. The PSCs using Spiro‐4TFETAD achieve a power conversion efficiency of 21.11% and excellent humidity resistance. It maintains an average 83% of their initial power conversion efficiency values even in high relative humidity of 60% without encapsulation and 82% of its initial performance after 100 h continuous illumination at the maximum power point. The superior performance underscores the promising potential of the trifluoroethoxyl molecular design in preparing new HTMs toward highly efficient and stable PSCs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[ 12,26,28 ] In addition, fluorination of materials is beneficial for the improvement of hydrophobicity, tuning of energy levels, and facilitation of charge transport. [ 18,29–34 ] It has also demonstrated that fluorine substitution on interfacial materials is beneficial for improving phase stability and decreasing structural defects of perovskite. [ 35 ] Based on these data, the modification of Spiro‐OMeTAD with a reasonable substituent, which is composed of alkoxyl and fluorine‐containing groups, is hypothesized to achieve new HTMs with desired properties to realize high PCE and stability in PSCs.…”

Section: Introductionmentioning

confidence: 99%

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A Trifluoroethoxyl Functionalized Spiro‐Based Hole‐Transporting Material for Highly Efficient and Stable Perovskite Solar Cells

Zhang

Yuan

et al. 2021

Solar RRL

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“…[ 15–19 ] In particular, use of the modern synthetic methods opens a way for a huge variety of the organic hole‐transporting materials (HTMs), while systematic study of variations could lead to the innovations in the field of molecular electronics. [ 20–24 ]…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18][19] In particular, use of the modern synthetic methods opens a way for a huge variety of the organic hole-transporting materials (HTMs), while systematic study of variations could lead to the innovations in the field of molecular electronics. [20][21][22][23][24] Carbazole and fluorene chromophores are among the most popular structural building blocks, used for the construction of the organic HTMs. [25][26][27][28][29][30] In a recent work, it was shown that the replacement of the methoxyphenyl fragment of the popular HTM Spiro-OMeTAD with the 9,9-dimethylfluorenyl chromophore led to the superior performance.…”

Section: Introductionmentioning

confidence: 99%

Molecular Engineering of Fluorene‐Based Hole‐Transporting Materials for Efficient Perovskite Solar Cells

et al. 2022

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New Spiro‐OMeTAD analogues and the simpler “half” structures with the terminated methoxyphenyl and/or carbazolyl chromophores are successfully synthesized under Hartwig–Buchwald amination conditions using commercially available starting materials. New fluorene‐based hole‐transporting materials combined with suitable ionization energies properly align with the valence band of the perovskite absorber. Additionally, these compounds are amorphous, which is an advantage for the formation of homogenous films, as well as eliminate the possibility for films to crystallize during operation of the devices. The most efficient perovskite solar cells devices contain carbazolyl‐terminated Spiro‐OMeTAD analogue V1267 and reach a power conversion efficiency of 18.3%, along with a short‐circuit current density, open‐circuit voltage, and fill factor of 23.41 mA cm−2, 1.06 V, and 74.0%, respectively. Moreover, “half” structures with methoxyphenyl/carbazolyl fragments show excellent long‐term stability and outperform Spiro‐OMeTAD and, therefore, hold a great prospect for practical wide‐scale applications in optoelectronic devices.

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Significant Efficiency and Stability Enhancement of Flexible Perovskite Solar Cells Combining with Multifunctional Effects of a Natural Spice

Yi,

Zhang,

Xiong

et al. 2023

Adv Funct Materials

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The numerous defect‐induced non‐radiative recombination losses and residual stress in the preparation of perovskite film greatly hinder the further improvement of the efficiency and stability of flexible perovskite solar cells (PSCs). Here, a natural spice 7‐amino‐4‐(trifluoromethyl)‐2‐benzopyrone (ATB) containing amino (─NH2), carbonyl (─C═O), and trifluoromethyl (─CF3) functional groups is introduced into the perovskite precursor solution, thereby preparing high‐quality perovskite film with low defect density. It is revealed that the utilization of ATB is beneficial to comprehensively passivate the defects and release the residual stress of perovskite film through the synergistic effect of functional groups, thereby improving the crystallinity and enhancing the carrier lifetime of perovskite film. Moreover, the introduction of ATB contributes to an improved energy levels alignment between the perovskite and adjacent layers, which facilitates fast carrier transport and suppresses the recombination loss in the flexible PSCs. Combined with the multifunctional effects of ATB, the target flexible and rigid PSCs with ATB modification yield remarkable photoelectric conversion efficiency (PCE) of 21.08% and 23.79%, respectively. More importantly, the ATB‐modified flexible device exhibits outstanding stability and retains 87.3% and 91.6% of the original efficiency after aging for 3000 h at 50 ± 5 relative humidity and 5000 bending cycles, respectively.

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Decorating hole transport material with −CF3 groups for highly efficient and stable perovskite solar cells

Cited by 18 publications

References 52 publications

A Trifluoroethoxyl Functionalized Spiro‐Based Hole‐Transporting Material for Highly Efficient and Stable Perovskite Solar Cells

A Trifluoroethoxyl Functionalized Spiro‐Based Hole‐Transporting Material for Highly Efficient and Stable Perovskite Solar Cells

Molecular Engineering of Fluorene‐Based Hole‐Transporting Materials for Efficient Perovskite Solar Cells

Significant Efficiency and Stability Enhancement of Flexible Perovskite Solar Cells Combining with Multifunctional Effects of a Natural Spice

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