Development of formamidinium lead iodide-based perovskite solar cells: efficiency and stability

Zheng, Zi-Wei; Wang, Shiyu; Hu, Yue; Rong, Yaoguang; Mei, Anyi; Han, Hongwei

doi:10.1039/d1sc04769h

Cited by 54 publications

(40 citation statements)

References 123 publications

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“…The undoped Mes‐TABT polymer showed a good hole‐carrier mobility as PTAA , reduced bimolecular recombination, and small charge transfer resistance. As a result, a PVSC device showed a power conversion efficiency (PCE) of 21.3 % with an open‐circuit voltage ( V oc ) of 1.15 V (Figure 1f), data compared favorably with the recently reported high performance of MAPbI 3 ‐PVSCs [8] . Unencapsulated devices using Mes‐TABT were more stable than those using the reference standard, PTAA .…”

Section: Introductionsupporting

confidence: 61%

“…As a result, a PVSC device showed a power conversion efficiency (PCE) of 21.3 % with an open-circuit voltage (V oc ) of 1.15 V (Figure 1f), data compared favorably with the recently reported high performance of MAPbI 3 -PVSCs. [8] Unencapsulated devices using Mes-TABT were more stable than those using the reference standard, PTAA. Overall, the Mes-TABT devices showed a better performance in MAPbI 3 SC devices than the current reference standard such as PTAA and Spiro-OMeTAD in terms of PCE, V oc , and stability.…”

Section: Introductionmentioning

confidence: 93%

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Triarylamine/Bithiophene Copolymer with Enhanced Quinoidal Character as Hole‐Transporting Material for Perovskite Solar Cells

et al. 2022

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Polytriarylamine is a popular hole‐transporting materials (HTMs) despite its suboptimal conductivity and significant recombination at the interface in a solar cell setup. Having noted insufficient conjugation among the triarylamine units along the polymer backbone, we inserted a bithiophene unit between two triarylamine units through iron‐catalyzed C−H/C−H coupling of a triarylamine/thiophene monomer so that two units conjugate effectively via four quinoidal rings when the molecule functions as HTM. The obtained triarylamine/bithiophene copolymer (TABT) used as HTM showed a high‐performance in methylammonium lead iodide perovskite (MAPbI3) solar cells. Mesityl substituted TABT forms a uniform film, shows high hole‐carrier mobility, and has an ionization potential (IP=5.40 eV) matching that of MAPbI3. We fabricated a solar cell device with a power conversion efficiency of 21.3 % and an open‐circuit voltage of 1.15 V, which exceeds the performance of devices using reference standard such as poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine (PTAA) and Spiro‐OMeTAD.

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Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 93%

Triarylamine/Bithiophene Copolymer with Enhanced Quinoidal Character as Hole‐Transporting Material for Perovskite Solar Cells

et al. 2022

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“…PSCs that employ perovskite single crystals or crystalline powders as precursors have a lower trap-state density, higher PCE, and better long-term stability than those based on powder mixtures. [15][16][17][18][19][20][21][22][23][24] Nevertheless, perovskite single crystals have a slow crystallisation rate and low production yield. In contrast, crystallised perovskite powders can be synthesised easier and in a low-cost manner using wet chemistry or mechanical processing.…”

Section: Introductionmentioning

confidence: 99%

“…A retrograde recrystallisation method was developed to obtain an α-phase perovskite powder for highly efficient PSCs. [17] A high-purity δ-phase perovskite powder prepared using cheap and low-grade raw materials can also lead to satisfactory and reproducible photovoltaic performance when used as a precursor. [17] Recently, Zhu et al successfully synthesised a high-purity δ-phase perovskite powder using mechanochemistry, and boosted the PCE of PSCs by over 24 %.…”

Section: Introductionmentioning

confidence: 99%

“…[17] A high-purity δ-phase perovskite powder prepared using cheap and low-grade raw materials can also lead to satisfactory and reproducible photovoltaic performance when used as a precursor. [17] Recently, Zhu et al successfully synthesised a high-purity δ-phase perovskite powder using mechanochemistry, and boosted the PCE of PSCs by over 24 %. [25] Despite the achieved progress, the currently available protocols for synthesising crystallised perovskite powders, including wet chemistry techniques and mechanochemistry, require an inert atmosphere or an organic solvent as the reaction medium, which is far from satisfactory in terms of mass production and environmental compatibility.…”

Section: Introductionmentioning

confidence: 99%

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Moisture‐Accelerated Precursor Crystallisation in Ambient Air for High‐Performance Perovskite Solar Cells toward Mass Production

et al. 2022

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Phase-pure crystallised perovskite is considered an excellent precursor for fabricating high-stability perovskite films with minimal defects. However, currently available protocols for synthesising crystallised perovskites must be conducted in an inert atmosphere or in the presence of an organic solvent as the reaction medium, which hinders mass production. Here, we report the fast synthesis of α-phase-crystallised perovskite powder assisted by moisture in ambient air. Moisture can promote the reaction between PbI 2 and organic salts and facilitate complete phase transition, as demonstrated in a joint experimental and theoretical study. Perovskite solar cells with a power conversion efficiency of 24.07 % were achieved using phase-pure crystallised perovskite powder as the precursor. This ambient-air-compatible method opens new vistas to reproducible high-quality precursors for large-scale photovoltaic applications.

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Anethole Regulated Crystallization for High Efficiency Carbon‐Based Perovskite Solar Cells

Hong,

Kang,

Huang

et al. 2024

Adv Funct Materials

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Two‐step sequential deposition is a widespread technique for the fabrication of perovskite films, renowned for its better control of the crystallization process. However, achieving a well‐controlled and complete reaction of PbI2 by organic ammonium salts remains a key challenge. Previous studies have predominantly focused on regulating the properties of the PbI2 layer while paying less attention to the high reactivity of organic ammonium salts. In this study, the natural molecule anethole is first explored to control perovskite crystallization during two‐step sequential deposition, focusing on the reactivity modulation of organic formamidine ion (FA+). It is demonstrated that FA+ exhibits strong hydrogen bond interactions with anethole, inhibiting the high reactivity of FA+ and effectively delaying the rapid reaction between FAI and PbI2. This decelerates the crystallization kinetics of perovskite films, facilitating the orderly and complete reaction of PbI2 by FAI while suppressing detrimental δ‐phase formation. Consequently, FA‐based perovskite films with high crystallinity, preferred orientation, and low defect state density are obtained. The fabricated planar hole transport layer‐free carbon electrode perovskite solar cells deliver an efficiency of 20.41% (certified efficiency of 20.0%), which is a new record for this kind of solar cell.

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Development of formamidinium lead iodide-based perovskite solar cells: efficiency and stability

Abstract: Perovskite materials have been particularly eye-catching by virtue of its excellent properties, such as high light absorption coefficient, long carrier lifetime, low exciton binding energy and bipolarity transmission, etc. Limited...

Cited by 54 publications

References 123 publications

Triarylamine/Bithiophene Copolymer with Enhanced Quinoidal Character as Hole‐Transporting Material for Perovskite Solar Cells

Triarylamine/Bithiophene Copolymer with Enhanced Quinoidal Character as Hole‐Transporting Material for Perovskite Solar Cells

Moisture‐Accelerated Precursor Crystallisation in Ambient Air for High‐Performance Perovskite Solar Cells toward Mass Production

Anethole Regulated Crystallization for High Efficiency Carbon‐Based Perovskite Solar Cells

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