Reductive ionic liquid-mediated crystallization for enhanced photovoltaic performance of Sn-based perovskite solar cells

He, Daping; Ran, Chenxin; Li, Wangyue; Liu, Xin; Gao, Weiyin; Xia, Yingdong; Chen, Yonghua; Huang, Wei

doi:10.1007/s11426-022-1352-7

Cited by 9 publications

(5 citation statements)

References 39 publications

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“…Perovskite solar cells (PSCs) have emerged as one of the most promising thin-film photovoltaic (PV) technologies for commercial deployment due to their low cost, tunable optoelectronic properties, and high power conversion efficiency (PCE) reaching 25.7%. [1][2][3][4][5][6][7][8][9] Moreover, the low-temperature deposition and solution processability of perovskite films enable the fabrication of lightweight flexible PSCs, which are expected in a variety of applications such as portable power supply, wearable electronics, and self-powered integrated devices. [10][11][12][13][14][15][16][17][18] Among the PSCs, inverted (p-i-n) PSCs are compatible with the production of flexible PSCs due to the employment Among the emerging photovoltaic technologies, rigid perovskite solar cells (PSCs) have made tremendous development owing to their exceptional power conversion efficiency (PCE) of up to 25.7%.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Flexible Perovskite Solar Cells through Pentylammonium Acetate Modification with Certified Efficiency of 23.35%

Gao

et al. 2022

Advanced Materials

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Among the emerging photovoltaic technologies, rigid perovskite solar cells (PSCs) have made tremendous development owing to their exceptional power conversion efficiency (PCE) of up to 25.7%. However, the record PCE of flexible PSCs (≈22.4%) still lags far behind their rigid counterparts and their mechanical stabilities are also not satisfactory. Herein, through modifying the interface between perovskite and hole transport layer via pentylammonium acetate (PenAAc) molecule a highly efficient and stable flexible inverted PSC is reported. Through synthetic manipulation of anion and cation, it is shown that the PenA+ and Ac− have strong chemical binding with both acceptor and donor defects of surface‐terminating ends on perovskite films. The PenAAc‐modified flexible PSCs achieve a record PCE of 23.68% (0.08 cm2, certified: 23.35%) with a high open‐circuit voltage (VOC) of 1.17 V. Large‐area devices (1.0 cm2) also realized an exceptional PCE of 21.52%. Moreover, the fabricated devices show excellent stability under mechanical bending, with PCE remaining above 91% of the original PCE even after 5000 bends.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient Flexible Perovskite Solar Cells through Pentylammonium Acetate Modification with Certified Efficiency of 23.35%

Gao

et al. 2022

Advanced Materials

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“…This can be avoided, for example, through gas quenching, which necessitates finer process control but is ultimately closer to a viable industrial process, or vacuum annealing . Alternatively, options include two-step processes where the organohalide is coated onto a metal halide template, , or the use of alternative solvent systems such as ionic liquids. , Both of these approaches constitute substantially alternative crystallization pathways that will consequently affect the crystal quality and defect formation. More varied efforts to alter the crystallization route for Sn-containing perovskites could yield significant advances in material quality.…”

Section: Challenges and Solutions For Tin-containing Perovskite Solar...mentioning

confidence: 99%

Prospects for Tin-Containing Halide Perovskite Photovoltaics

Smith

Snaith

et al. 2023

Precision Chemistry

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Tin-containing metal halide perovskites have enormous potential as photovoltaics, both in narrow band gap mixed tin−lead materials for all-perovskite tandems and for lead-free perovskites. The introduction of Sn(II), however, has significant effects on the solution chemistry, crystallization, defect states, and other material properties in halide perovskites. In this perspective, we summarize the main hurdles for tin-containing perovskites and highlight successful attempts made by the community to overcome them. We discuss important research directions for the development of these materials and propose some approaches to achieve a unified understanding of Sn incorporation. We particularly focus on the discussion of charge carrier dynamics and nonradiative losses at the interfaces between perovskite and charge extraction layers in p-i-n cells. We hope these insights will aid the community to accelerate the development of high-performance, stable single-junction tincontaining perovskite solar cells and all-perovskite tandems.

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“…Dong et al developed an ion exchange strategy by introducing an MA-based ion liquid into the FASnI 3 perovskite precursor to retard the crystallization process. The resulting lead-free TPSCs yielded a PCE of 8.5% . However, the effects of ion liquid additives on the intermediate phases of the tin perovskite precursors have not yet been investigated.…”

Section: Mechanism Of Mafa In Perovskite Crystallizationmentioning

confidence: 99%

“…The resulting lead-free TPSCs yielded a PCE of 8.5%. 26 However, the effects of ion liquid additives on the intermediate phases of the tin perovskite precursors have not yet been investigated. Besides, the superior optoelectronic and nontoxic properties of FA 0.75 MA 0.25 SnI 3 can be used to develop novel adduct approaches, allowing the formation of high-quality films for high-performance TPSCs.…”

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confidence: 99%

Ionic Liquid-Mediated Intermediate Phase Adduct Constructing for Highly Stable Lead-Free Perovskite Solar Cells

Zhou

Yan

Zhang

et al. 2023

ACS Materials Lett.

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The intermediate phase adduct plays a crucial role in constructing uniform and compact tin perovskite films, thus providing an important approach for developing high-performance lead-free perovskite solar cells. However, the common intermediate phase adduct of SnI2·3DMSO in tin perovskite leads to phase separation and may lack compatibility with mixed cation tin perovskites composed of formamidinium (FA) and methylamine (MA), impeding the further device stability. Here, a facile and reproducible method is developed to fabricate high-quality FA0.75MA0.25SnI3 films by introducing a new stable intermediate phase adduct (SnI2·DMSO·MAFa) by using ionic liquid methylamine formate (MAFa). The resulting stable adduct suppresses the reaction rate between ammonium salts and SnI2, thereby modulating the tin perovskite crystallization and precluding SnI2 clusters formation, and the presence of the SnI2·DMSO·MAFa adduct in perovskite precursor serves as a protective barrier for Sn2+ ions, guarding them against oxidation caused by the presence of DMSO. Moreover, the amino and carbonyl groups in residual MAFa could repair the iodine vacancy and uncoordinated Sn2+ ion defects. These features result in the formation of highly uniform and pinhole-free FA0.75MA0.25SnI3 films. The optimized devices achieve a power conversion efficiency (PCE) of over 10%, a value of 53% higher than that of the control device (6.6%). Besides, the obtained MAFa-derived devices illustrate significantly enhanced stability in a microaerobic atmosphere, with 78% maintained initial efficiency over 2800 h of storage under N2 containing 50–100 ppm of O2.

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Reductive ionic liquid-mediated crystallization for enhanced photovoltaic performance of Sn-based perovskite solar cells

Cited by 9 publications

References 39 publications

Highly Efficient Flexible Perovskite Solar Cells through Pentylammonium Acetate Modification with Certified Efficiency of 23.35%

Highly Efficient Flexible Perovskite Solar Cells through Pentylammonium Acetate Modification with Certified Efficiency of 23.35%

Prospects for Tin-Containing Halide Perovskite Photovoltaics

Ionic Liquid-Mediated Intermediate Phase Adduct Constructing for Highly Stable Lead-Free Perovskite Solar Cells

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