Multiple-cation wide-bandgap perovskite solar cells grown using cesium formate as the Cs precursor with high efficiency under sunlight and indoor illumination

Guo, Qiang; Ding, Yuanjia; Dai, Zheng; Chen, Zongwei; Du, Miao; Wang, Zongtao; Gao, Lei; Duan, Chen; Guo, Qing; Zhou, Erjun

doi:10.1039/d2cp02358j

Cited by 10 publications

(6 citation statements)

References 44 publications

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“…The fast time component (τ 1 ) implies the charge carrier was captured at the perovskite grain boundary and perovskite/HTMs interface, and the second component (τ 2 ) represents the injection of holes from the perovskite to the HTMs. 37,38 The results of TAS were consistent with the results of TRPL. All the photophysical properties and charge transport properties of CsPbI 2 Br, HTMs, and CsPbI 2 Br/ HTMs are summarized in Table S4.…”

Section: Resultssupporting

confidence: 83%

Fluorine substitutions engineering of benzotriazole‐based hole transport polymers toward high‐performance CsPbI₂Br perovskite solar cells

Dai,

Duan,

Guo

et al. 2024

Battery Energy

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Developing suitable hole transport materials is of utmost importance in the quest to enhance the performance of CsPbI2Br perovskite solar cells (PSCs). Among the various undoped hole transport materials (HTMs), D‐π‐A type polymers incorporating benzodithiophene (BDT) as the D unit and benzotriazole (BTA) as the A unit have shown promising potential. To further optimize the energy level and enhance the hole transport ability of these HTMs, we employed a fluorine substitution strategy to synthesize P‐BTA‐2F and P‐BTA‐4F based on the polymer P‐BTA‐0F. Subsequently, we investigated the impact of varying degrees of fluorine substitution on the properties of the polymer materials and the performance of the devices. As the number of F substitutions increases, the polymer energy level of the HTM gradually shifts downward, the face‐on stacking of the HTM strengthens, the hole mobility of the HTM increases, and the rate of hole extraction and transport becomes faster. Ultimately, the CsPbI2Br PSCs based on the P‐BTA‐4F HTM achieve the highest power conversion efficiency (PCE) of 17.68%. Those findings demonstrate that selecting an appropriate amount of fluorine substitution is crucial for regulating the performance of polymer HTMs and improving device efficiency.

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Section: Resultssupporting

confidence: 83%

Fluorine substitutions engineering of benzotriazole‐based hole transport polymers toward high‐performance CsPbI₂Br perovskite solar cells

Dai,

Duan,

Guo

et al. 2024

Battery Energy

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“…As shown in Figure f, the data were fitted based on the biexponential function, y 0 = A 1 exp(− x /τ 1 ) + A 2 exp(− x /τ 2 ), and the detailed parameters are summarized in Table S3. The fast time component (τ 1 ) can be explained as the charge carrier capture at the CsPbI 2 Br grain boundaries and CsPbI 2 Br/HTM interfaces. , The τ 1 of CsPbI 2 Br/PE61 is faster than that of CsPbI 2 Br/PBDB-T and CsPbI 2 Br/J52 samples, demonstrating the quickest traps filling in the CsPbI 2 Br/PE61 device. The second component (τ 2 ) can be interpreted as the hole injections from the CsPbI 2 Br into the HTMs .…”

Section: Resultsmentioning

confidence: 99%

Constructing D-π-A Type Polymers as Dopant-Free Hole Transport Materials for High-Performance CsPbI₂Br Perovskite Solar Cells

Dai

Guo

Ding

et al. 2023

ACS Appl. Mater. Interfaces

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Hole-transporting materials (HTMs) play a major role in efficient and stable perovskite solar cells (PSCs), especially for CsPbI2Br inorganic PSC. Among them, dopant-free conjugated polymers attract more attention because of the advantages of high hole mobility and high stability. However, the relationship between the polymer structure and the photovoltaic performance is rarely investigated. In this work, we choose three similar D-π-A-type polymers, where the D unit and π-bridge are fixed into benzodithiophene and thiophene, respectively. By changing the A units from classic benzodithiophene-4,8-dione and benzotriazole to quinoxaline, three polymers PBDB-T, J52, and PE61 are utilized as dopant-free HTMs for CsPbI2Br PSCs. The energy levels, hole mobility, and molecular stacking of the three HTMs, as well as charge transfer between CsPbI2Br/HTMs, are fully investigated. Finally, the device based on PE61 HTM obtains the champion power conversion efficiency of 16.72%, obviously higher than PBDB-T (15.13%) and J52 (15.52%). In addition, the device based on PE61 HTM displays the best long-term stability. Those results demonstrate that quinoxaline is also an effective A unit to construct D-π-A-type polymers as HTMs and improve the photovoltaic performance of PSCs.

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“…36 In the control film, there was an obvious broadening of GSB, which could be divided into two peaks at 797 and 828 nm, and in the longer wavelengths of 850−950 nm, the negative signals indicated rich interband states that mainly derived from trap states or impurity phases. 37,38 We recorded TA decays of two split GSB peaks and the standard GSB peak at 797 nm of the target film, in Figure 5c. Regardless of 797 or 828 nm, their peaks decayed faster than the target GSB peak, which could be attributed to serious trap-assisted recombination in the control film.…”

Section: Resultsmentioning

confidence: 99%

Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

Ji,

Zhong,

et al. 2024

ACS Nano

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Perovskite light-emitting diodes (PeLEDs) are the next promising display technologies because of their high color purity and wide color gamut, while two classical emitter forms, i.e., polycrystalline domains and quantum dots, are encountering bottlenecks. Weak carrier confinement of large polycrystalline domains leads to inadequate radiative recombination, and surface ligands on quantum dots are the main annihilation sites for injected carriers. Here, pinpointing these issues, we screened out an amphoteric agent, namely, 2-(2aminobenzoyl)benzoic acid (2-BA), to precisely control the in situ growth of FAPbI 3 (FA: formamidine) nanodomains with enhanced space confinement, preferred crystal orientation, and passivated trap states on the transport-layer substrate. The amphoteric 2-BA performs bidentate chelating functions on the formation of ultrasmall perovskite colloids (<1 nm) in the precursor, resulting in a smoother FAPbI 3 emitting layer. Based on monodispersed and homogeneous nanodomain films, a near-infrared PeLED device with a champion efficiency of >22% plus enhanced T 80 operational stability was achieved. The proposed perovskite nanodomain film tends to be a mainstream emitter toward the performance breakthrough of PeLED devices covering visible wavelengths beyond infrared.

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Multiple-cation wide-bandgap perovskite solar cells grown using cesium formate as the Cs precursor with high efficiency under sunlight and indoor illumination

Abstract: Owing to the advantages of bandgap adjustable, low-cost fabrication and superior photovoltaic performance, wide-bandgap (WBG) perovskite solar cells (PSCs) are considered as promising top-cell for multi-junction solar cells. At the...

Cited by 10 publications

References 44 publications

Fluorine substitutions engineering of benzotriazole‐based hole transport polymers toward high‐performance CsPbI₂Br perovskite solar cells

Fluorine substitutions engineering of benzotriazole‐based hole transport polymers toward high‐performance CsPbI₂Br perovskite solar cells

Constructing D-π-A Type Polymers as Dopant-Free Hole Transport Materials for High-Performance CsPbI₂Br Perovskite Solar Cells

Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

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Multiple-cation wide-bandgap perovskite solar cells grown using cesium formate as the Cs precursor with high efficiency under sunlight and indoor illumination

Abstract: Owing to the advantages of bandgap adjustable, low-cost fabrication and superior photovoltaic performance, wide-bandgap (WBG) perovskite solar cells (PSCs) are considered as promising top-cell for multi-junction solar cells. At the...

Cited by 10 publications

References 44 publications

Fluorine substitutions engineering of benzotriazole‐based hole transport polymers toward high‐performance CsPbI2Br perovskite solar cells

Fluorine substitutions engineering of benzotriazole‐based hole transport polymers toward high‐performance CsPbI2Br perovskite solar cells

Constructing D-π-A Type Polymers as Dopant-Free Hole Transport Materials for High-Performance CsPbI2Br Perovskite Solar Cells

Amphoteric Chelating Ultrasmall Colloids for FAPbI3 Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes

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Fluorine substitutions engineering of benzotriazole‐based hole transport polymers toward high‐performance CsPbI₂Br perovskite solar cells

Fluorine substitutions engineering of benzotriazole‐based hole transport polymers toward high‐performance CsPbI₂Br perovskite solar cells

Constructing D-π-A Type Polymers as Dopant-Free Hole Transport Materials for High-Performance CsPbI₂Br Perovskite Solar Cells

Amphoteric Chelating Ultrasmall Colloids for FAPbI₃ Nanodomains Enable Efficient Near-Infrared Light-Emitting Diodes