Fabrication of efficient formamidinium perovskite solar cells under ambient air via intermediate-modulated crystallization

Wang, Gaoxiang; Wang, Lipeng; Qiu, Jianhang; Zheng, Yan; Tai, Kaiping; Yu, Wei; Jiang, Xin

doi:10.1016/j.solener.2019.05.033

Cited by 35 publications

(42 citation statements)

References 47 publications

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“…[ 33 ] However, the interaction between FA + and DMSO is weaker than the affinity toward PbI 2 , leading to the instability of the adduct FAI·PbI 2 ·DMSO adduct. [ 72 ] Lee et al introduced thiourea and DMSO mixed solvent in the FAPbI 3 precursor. The fabricated FAPbI 3 perovskite film showed more uniformed morphology and better photovoltaic performance.…”

Section: The Strategy To Achieve and Maintain α‐Fapbi3 Phase In Pscsmentioning

confidence: 99%

Advances to High‐Performance Black‐Phase FAPbI₃ Perovskite for Efficient and Stable Photovoltaics

Chen

Zhang

et al. 2021

Small Structures

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Formamidinium lead iodide (FAPbI3)‐based perovskites have become one of the most promising candidate materials for high efficiency and thermally stable perovskite solar cells due to their outstanding optoelectrical properties and high thermal stability. However, the phase degradation of black FAPbI3 perovskite phase to yellow nonperovskite phase at ambient conditions restricts the long‐term stability of FAPbI3 perovskite solar cells. Such phase transition can be affected by various conditions especially under humidity and thermal stress. To address the phase instability issue, tremendous research efforts have been devoted to crystallizing high‐quality black phase and refraining the photoinactive δ‐phase formation. Herein, first, these research efforts are summarized for the deposition of FAPbI3 perovskite film and the stabilization of pure α‐FAPbI3 perovskite, then the FAPbI3 structural features and phase transformation behavior are discussed. The corresponding strategies for maintaining black phase and enhancing optical properties of FAPbI3 perovskite is also concluded. Second, the latest progress and achievement of stabilizing black‐phase FAPbI3 are discussed through various methods including additives, doping, and alloying, interfacial engineering, etc. Finally, the future research directions and strategies to achieve high efficiency and stable FAPbI3‐based perovskite solar cells are described.

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Section: The Strategy To Achieve and Maintain α‐Fapbi3 Phase In Pscsmentioning

confidence: 99%

Advances to High‐Performance Black‐Phase FAPbI₃ Perovskite for Efficient and Stable Photovoltaics

Chen

Zhang

et al. 2021

Small Structures

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“…Nevertheless, the lower bandgap of 1.48 eV of formamidinium lead iodide (FAPI) than MAPI, closer to the ideal one determined by the Schockley-Queisser limit, 24 has identified it as a superior candidate for single-junction solar cells. 25 − 27 Important milestones have been achieved in terms of the stability of the formamidinium PSCs prepared under controlled conditions in the glovebox, 28 − 30 but their fabrication in air has received less attention 31 and mostly at low-moisture conditions not under real ambient conditions. Indeed, to switch on an ambient fabrication, a method strongly preferred for industrial production, the whole fabrication process and the growth dynamics of perovskite cubic phase must be well regulated allowing for better crystallinity and morphology.…”

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confidence: 99%

“… 43 , 44 The most common Lewis acid–base approach in the case of FAPI, is based on the use of N -methyl pyrrolidone (NMP). 26 The intermediate FAI·PbI 2 ·NMP adduct 31 , 45 assists the formation of smooth and pinhole-free perovskite thin films at ambient atmosphere, and the pure FAPI reaches a stabilized PCE of 16.69% stable for about 1 month at low RH < 20%. Another additive with several advantages is embedded PbS quantum dots (QDs) into the perovskite thin films.…”

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Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication

et al. 2021

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Due to the high industrial interest for perovskite-based photovoltaic devices, there is an urgent need to fabricate them under ambient atmosphere, not limited to low relative humidity (RH) conditions. The formamidinium lead iodide (FAPI) perovskite α-black phase is not stable at room temperature and is challenging to stabilize in an ambient environment. In this work, we show that pure FAPI perovskite solar cells (PSCs) have a dramatic increase of device long-term stability when prepared under ambient air compared to FAPI PSCs made under nitrogen, both fabricated with N -methylpyrrolidone (NMP). The T 80 parameter, the time in which the efficiency drops to 80% of the initial value, increases from 21 (in N 2 ) to 112 days (in ambient) to 145 days if PbS quantum dots (QDs) are introduced as additives in air-prepared FAPI PSCs. Furthermore, by adding methylammonium chloride (MACl) the power conversion efficiency (PCE) reaches 19.4% and devices maintain 100% of the original performance for at least 53 days. The presence of Pb–O bonds only in the FAPI films prepared in ambient conditions blocks the propagation of α- to δ-FAPI phase conversion. Thus, these results open the way to a new strategy for the stabilization in ambient air toward perovskite solar cells commercialization.

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“…[6,7] Substitution of the A site provides minor electronic structural changes and improved stability. Organic cations such as CH 3 NH 3 þ (MA þ ) [8][9][10] and CH(NH 2 ) 2 þ (FA þ ) [11][12][13][14] with alkali metal cations such as Cs þ , [15,16] Rb þ , [17][18][19] and K þ [13,14] have been selected for the A site because they have suitable ionic radii to form the APbI 3 perovskite structure by taking into consideration the t-factor and the stability of the crystal. In addition, several studies have been conducted on the addition of organic cations that exceed the acceptable ionic radii.…”

Section: Introductionmentioning

confidence: 99%

Additive Effects of Guanidinium Iodide on CH₃NH₃PbI₃ Perovskite Solar Cells

Kishimoto

Oku

Suzuki

et al. 2021

Physica Status Solidi (a)

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CH 3 NH 3 PbI 3 (MAPbI 3 ) perovskite solar cells with guanidinium (C(NH 2 ) 3 þ , GA þ ) are fabricated at 150 C using 3CH 3 NH 3 I:PbCl 2 starting composition in ambient atmosphere, and characterized. Their photoconversion efficiencies and stabilities are improved by the addition of a small amount of GA þ . Lattice volumes are increased by the addition of GA þ , which confirms the occurrence of GA þ substitution at the CH 3 NH 3 site. Energy gaps are decreased by the addition of GA þ , which agrees well with the results of molecular orbital calculation and band calculation. The carrier trap density is reduced by the GA þ addition, which suggests that lattice defects are suppressed by the GA þ doping. Two-year stabilities of the devices in ordinary air are also investigated, which indicate the effectiveness of GA addition.

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Fabrication of efficient formamidinium perovskite solar cells under ambient air via intermediate-modulated crystallization

Cited by 35 publications

References 47 publications

Advances to High‐Performance Black‐Phase FAPbI₃ Perovskite for Efficient and Stable Photovoltaics

Advances to High‐Performance Black‐Phase FAPbI₃ Perovskite for Efficient and Stable Photovoltaics

Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication

Additive Effects of Guanidinium Iodide on CH₃NH₃PbI₃ Perovskite Solar Cells

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Fabrication of efficient formamidinium perovskite solar cells under ambient air via intermediate-modulated crystallization

Cited by 35 publications

References 47 publications

Advances to High‐Performance Black‐Phase FAPbI3 Perovskite for Efficient and Stable Photovoltaics

Advances to High‐Performance Black‐Phase FAPbI3 Perovskite for Efficient and Stable Photovoltaics

Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication

Additive Effects of Guanidinium Iodide on CH3NH3PbI3 Perovskite Solar Cells

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Product

Resources

About

Advances to High‐Performance Black‐Phase FAPbI₃ Perovskite for Efficient and Stable Photovoltaics

Advances to High‐Performance Black‐Phase FAPbI₃ Perovskite for Efficient and Stable Photovoltaics

Additive Effects of Guanidinium Iodide on CH₃NH₃PbI₃ Perovskite Solar Cells