Stable high conversion efficiency of Quasi-2D perovskite solar cells via potassium iodide as additive

Qu, Qianqian; Zhou, Jinxiao; Xi, Xiaoyan; Wang, Boxin; Wan, Zengli; Wang, Jinxi; Liu, Huijin; Zhou, Huiqiong; Bi, Shiqing

doi:10.1016/j.cej.2023.142999

Cited by 5 publications

(4 citation statements)

References 40 publications

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“…In our previous work, we found that potassium ions can enhance the quality of two-dimensional perovskite films and ultimately boost the conversion efficiency and stability of the device. [21] In this work, we adopt sodium ion which has a smaller ion radius than potassium ion additive to improve the quality of quasi-2D perovskite ((BA) 2 (MA) 3 Pb 4 I 13 ) and increase the PCE of corresponding solar cells. All operating steps, except the evaporation electrode, were prepared in air.…”

Section: Introductionmentioning

confidence: 99%

High–Quality and Stable Quasi‐2D Perovskite Film Prepared by Introducing Alkali Metal Ion Additive

Gong,

Zhou,

et al. 2024

ChemistrySelect

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Due to the excellent stability, researchers have shown great interest in quasi two–dimensional (2D) perovskite in recent years. However, the poor film quality and low photoelectric conversion efficiency (PCE) of 2D perovskite solar cells are still a major issue that restricts them from catching up with three–dimensional (3D) perovskite. Herein, we introduce sodium iodide as an additive to improve the surface coverage of 2D perovskite ((BA)2(MA)3Pb4I13) films and reduce the number of grain boundaries. Steady–state photoluminescence (PL) and ultraviolet photoelectron spectroscopy (UPS) indicate that non–radiative defects are suppressed and the band alignment is regulated. After modified by NaI, the film surface coverage enhances and the number of holes decreases. As a result, the PCE of device with NaI increases from 13.63 % to 16.40 % at optimal concentration, and the hysteresis effect is also suppressed. Besides, the humidity and thermal stability of perovskite are enhanced. The device with NaI modification can keep 80 % of initial efficiency, compared to 30 % for reference device after stored 30 days under ambient air condition. This work provides a simple method to improve the quality of quasi 2D perovskite films.

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Section: Introductionmentioning

confidence: 99%

High–Quality and Stable Quasi‐2D Perovskite Film Prepared by Introducing Alkali Metal Ion Additive

Gong,

Zhou,

et al. 2024

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“…Niu et al added different alkali-metal ions to the inorganic CsBr/PbI 2 framework to regulate the halogen exchange in the vapor–solid reaction process, resulting in high-quality perovskite films . Notably, potassium halide has become a commonly used doping material because the small-size K + cations can easily access the perovskite lattice and effectively reduce nonradiative losses, thereby enhancing the photovoltaic performance of PSCs. − However, current research on K + doping is mainly based on liquid-phase methods, , with a limited understanding of the doping mechanisms during the vapor deposition process.…”

Section: Introductionmentioning

confidence: 99%

Doping with KBr to Achieve High-Performance CsPbBr₃ Semitransparent Perovskite Solar Cells

Jiang,

Geng,

et al. 2024

ACS Appl. Mater. Interfaces

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Wide-bandgap semitransparent perovskite photovoltaics are emerging as one of the ideal candidates for building-integrated photovoltaics (BIPV). However, surface defects in inorganic CsPbBr 3 perovskite prepared by vapor deposition severely limit the optoelectronic performance of perovskite solar cells. To address this issue, a strategy of doping a trace amount of KBr into perovskite by vapor deposition is adopted, effectively improving the quality of the film, reducing surface defect concentration, and enhancing the transportation and extraction of charge carriers. Simultaneously, fully physical vapor deposition technology is employed to fabricate perovskite solar cells with an average visible light transmittance of 44%. These devices exhibited an ultrahigh open-circuit voltage of 1.55 V and a superior power conversion efficiency (PCE) of 7.28%, demonstrating excellent moisture and heat resistance. Moreover, the corresponding 5 cm × 5 cm modules achieve a PCE of 5.35% with great thermal insulation capability. This work provides an approach for fabricating highly efficient all-inorganic perovskite solar cells with high average visible light transmittance, demonstrating new insights into their application in building-integrated photovoltaics.

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“…To achieve desirable perovskite films, additive engineering is one of the most effective approaches to regulate perovskite grain size, passivate film defects, and modulate energy levels, − thus improving the quality of perovskite films as well as the photovoltaic performance and stability of devices. Various types of additives have been utilized, including organic and inorganic cations such as MA + , Cs + , and K + , ,, anions such as −COOH , and −SCN, small molecules, − and polymers that act as Lewis bases. − It has been reported that amine additives play an active role in regulating perovskite grain sizes and passivating film defects. The introduced 2-fluoroethylamine into the PbI 2 precursor solution resulted in passivated film defects, suppressed nonradiative complexation, and extended carrier lifetime, obtaining a rigid device with a maximum efficiency of 23.40% .…”

Section: Introductionmentioning

confidence: 99%

Silane Doping for Efficient Flexible Perovskite Solar Cells with Improved Defect Passivation and Device Stability

Chen,

Ai,

et al. 2024

ACS Appl. Mater. Interfaces

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In this work, doping 3-amino-propyl triethoxysilane (APTES) into a perovskite precursor is proven to be an effective strategy, which can passivate crystal defects, control the crystallization rate, and improve the morphology. APTES can form oligomers through hydrolysis and a condensation reaction, thus blocking the invasion of external water molecules. In addition, the lone pair electrons on the N atom in the amino group of APTES form a coordination bond with perovskite by sharing the empty 6p orbital on Pb 2+ , which can effectively passivate the defects of the film and realize a highly uniform and dense perovskite film with preferential crystal growth orientation. The film exhibits high (110) crystal plane orientation and long carrier lifetime and mobility, which improves the performance of flexible perovskite solar cells. Using this approach, the champion device presents an optimal power conversion efficiency of 19.84% with much promoted air stability. Moreover, the efficiency of flexible devices does not decrease after maximum power point irradiation for 360 s.

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Stable high conversion efficiency of Quasi-2D perovskite solar cells via potassium iodide as additive

Cited by 5 publications

References 40 publications

High–Quality and Stable Quasi‐2D Perovskite Film Prepared by Introducing Alkali Metal Ion Additive

High–Quality and Stable Quasi‐2D Perovskite Film Prepared by Introducing Alkali Metal Ion Additive

Doping with KBr to Achieve High-Performance CsPbBr₃ Semitransparent Perovskite Solar Cells

Silane Doping for Efficient Flexible Perovskite Solar Cells with Improved Defect Passivation and Device Stability

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Stable high conversion efficiency of Quasi-2D perovskite solar cells via potassium iodide as additive

Cited by 5 publications

References 40 publications

High–Quality and Stable Quasi‐2D Perovskite Film Prepared by Introducing Alkali Metal Ion Additive

High–Quality and Stable Quasi‐2D Perovskite Film Prepared by Introducing Alkali Metal Ion Additive

Doping with KBr to Achieve High-Performance CsPbBr3 Semitransparent Perovskite Solar Cells

Silane Doping for Efficient Flexible Perovskite Solar Cells with Improved Defect Passivation and Device Stability

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Doping with KBr to Achieve High-Performance CsPbBr₃ Semitransparent Perovskite Solar Cells