Fluorination of Carbazole-Based Polymeric Hole-Transporting Material Improves Device Performance of Perovskite Solar Cells with Fill Factor up to 82%

Jia, Xiao’e; Yang, Yongchao; Xue, Qifan; Xie, Yue‐Min; Wang, Zhenfeng; Yin, Qingwu; Li, Zhenchao; Wang, Fuzeng; Lin, Kaiwen; Yip, Hin‐Lap

doi:10.1021/acsaem.2c01415

Cited by 9 publications

(4 citation statements)

References 64 publications

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“…In 2022, Jia et al designed two conjugated polymer compounds with indacenodithieno[3,2- b ]thiophene (IDTT) and carbazole termed as P1 (nonfluorinated polymer) and P2 (fluorinated polymer) in which fluorine is attached at the 3 and 6 positions of carbazole (Figure ). Also, 3,5-bis(trifluoromethyl)benzene was attached to the nitrogen atom of the carbazole to increase the solubility. The conjugated polymers were selected instead of the small molecules as HTM due to high thermal stability, high hole mobility as the conjugation increases, and excellent film-forming property.…”

Section: Carbazole-based Htmsmentioning

confidence: 99%

Review on Carbazole-Based Hole Transporting Materials for Perovskite Solar Cell

Radhakrishna

Manjunath

Devadiga

et al. 2023

ACS Appl. Energy Mater.

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Solar cells constructed with organic−inorganic metal halide perovskite is a hot topic as they can replace the existing traditional silicon-based solar cells. The major hurdle in the commercialization of perovskite solar cells is the efficiency of the device. In this context, the use of a suitable organic hole transporting material would improve the efficiency of the perovskite solar cells. Until now, spiro-OMeTAD (2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene) is the standard hole transporting material (HTM) used in the fabrication of perovskite solar cells, and the major issue associated with spiro-OMeTAD is the complex multistep synthesis and the observed difficulty in the purification steps which make this HTM as cost-ineffective. Nowadays, certain hole transporting materials made up of organic small molecules carrying motifs like thiophene, triphenylamine, triazatruxane, pyrene, and carbazole exhibited better photovoltaic properties and less costs are involved for their synthesis, which motivate the researchers to work further on the design and development of non-spiro-OMeTAD. Among the various organic small molecule based HTMs, carbazole unit based HTMs exhibited better photovoltaic properties, chemical stability, easy functionalization, and device performance. Thus, the present review mainly focused on the diverse carbazole-based hole transporting molecular designs and their synthetic strategies which have been reported during the past eight years. Also, the review tries to correlate the molecular structure of different carbazole-based HTMs and their observed energy band gap, HOMO−LUMO levels, hole mobilities, and power conversion efficiencies for the fabricated perovskite solar cells.

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Section: Carbazole-based Htmsmentioning

confidence: 99%

Review on Carbazole-Based Hole Transporting Materials for Perovskite Solar Cell

Radhakrishna

Manjunath

Devadiga

et al. 2023

ACS Appl. Energy Mater.

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“…50 The fluorinated redox center favors a deep HOMO level in functionalized conjugated polymers, which is convenient on the surface of perovskite for higher hole mobility. 51 Sulfonated poly(thiophene-3-[2-(2methoxyethoxy)ethoxy]-2,5-diyl) (S−P3MEET) was reported to yield impressive efficiency (17.25%) over PEDOT:PSS (14.97). 52 The solar efficiency of P5NH (donor−acceptor)based PSSC was reported as 18.1%, comparatively higher than P3HT (15.50%) and P25NH.…”

Section: Introduction and Backgroundsmentioning

confidence: 99%

“…The single ion conducting polymers (polyelectrolytes) have been developed through grafting with sulfonamide, γ-propane sultone, and bis(sulfonyl)imide groups to the polymer backbone . The fluorinated redox center favors a deep HOMO level in functionalized conjugated polymers, which is convenient on the surface of perovskite for higher hole mobility . Sulfonated poly(thiophene-3-[2-(2-methoxyethoxy)ethoxy]-2,5-diyl) (S–P3MEET) was reported to yield impressive efficiency (17.25%) over PEDOT:PSS (14.97) .…”

Section: Introduction and Backgroundsmentioning

confidence: 99%

Review on Functional Electrolyte, Redox Polymers, and Solar Conversions in 3G Emerging Photovoltaic Technologies: Progress and Outlook

Kumar,

Maiti

2023

Energy Fuels

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Abundant solar energy has transformed the present solar photovoltaics owing to its rapid conversion into electrical energy without deteriorating ecosystem. Third generation (3G) energy conversion devices reveal utilization of photosensitizer, i.e., organic dye, quantum dots, and perovskite as functional absorbing materials to transform solar energy. Functional polymers are key ingredients (fuels) for the development of suitable redox potential and high temperature or humidity resistive charge transport medium. Electrolyte accelerates the photovoltaic reversible reaction (hole conduction) through exposure of a minimum energy barrier between the photoanode and cathode. Redox-active polymer enhances electrolyte uptake efficiency, ionic conductivity, and dimensional stability of solar device. Various electrolytes exhibit different functional activities due to their different redox energy. The functionalized polymer bears appropriate HOMO–LUMO energetics and low activation energy, which could adjust different photosensitizer with better compatibility. Therefore, the redox polymer percolates a redox couple at a photoexcited sensitizer through control of undesired reactions. It plays the important role of ion and electron transport mediator via expanding suitable interfacial energetics and band structure for photovoltaic reaction. The polymeric pendant groups (chemical environments) preserve electrolyte couples through reducing wettability and thus immobilize the active density of electrolyte anions for photovoltaic reactions. Thus, the polymer improves reversibility due to interfacial compatibility, electrolyte filtration effect, and synergistic stabilization. The present review focuses on polymer-derived functional electrolytes, photosensitizer–polymer interface, thermodynamic interactions, and power conversion efficiencies of 3G photovoltaic devices. Functional polymers open an avenue for the development of stable and efficient photovoltaic reactions at low cost based dyes, quantum dots, and perovskite-sensitized solar conversion systems.

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“…Jia et al reported two carbazole based HTMs: P2 with two fluoro-substituents exhibits a PCE of 19.4% with FF of 82% and retaining 90% of its original PCE after 600 h of storage, while P1 without fluoro-substituents shows a lower PCE of 16.5%. 25 Wan et al reported a bithiophene based HTM PFDT-COOH; the corresponding PVSCs showed the maximum PCE of 20.64%, and adding two fluoro-substituents, the resulting PFDT-2F-COOH endows the PVSCs with a peak PCE of 21.68%. 26 Moreover, the attractive noncovalent interactions and conformation locking between S and F can reduce the torsion angles and steric hindrance between the BTz unit and adjacent thiophene units, thus improving the planarity of the polymer backbone.…”

Section: Introductionmentioning

confidence: 99%