Grain boundary defect passivation by in situ formed wide-bandgap lead sulfate for efficient and stable perovskite solar cells

Ma, Xiaoliang; Yang, Liqun; Shang, Xueni; Li, Mengjia; Gao, Deyu; Wu, Cuncun; Zheng, Shijian; Zhang, Boxue; Chen, Jiangzhao; Chen, Cong; Song, Hongwei

doi:10.1016/j.cej.2021.130685

Cited by 40 publications

(32 citation statements)

References 44 publications

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“…[7,8] After selecting pure FA or FA-rich Pb-based perovskites, consequently, the preparation of high-quality perovskite films with less defects and large grain sizes is crucial to achieve high-efficiency PSCs. Various strategies have been adopted to optimize the quality of perovskite films, principally including deposition methods, [17,18] solvent engineering, [19][20][21] additive engineering, [22][23][24][25] and interface engineering. [26][27][28][29][30] These universal approaches are appropriate for all perovskites including pure FA and FA-rich perovskites.…”

Section: Introductionmentioning

confidence: 99%

Methodologies for >30% Efficient Perovskite Solar Cells via Enhancement of Voltage and Fill Factor

Chen

Park

2021

Solar RRL

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To further improve power conversion efficiency (PCE) toward ShockleyÀQueisser limit efficiency approaching 32% for a single-junction perovskite solar cell (PSC) based on a lead halide perovskite with a bandgap of about 1.45 eV, it is important to improve the open-circuit voltage and fill factor (FF) significantly without sacrificing short-circuit current density. Herein, the advancements of the formamidinium-rich PSCs with PCEs exceeding 23% from the viewpoints of composition engineering, solvent engineering, additive engineering, and interface engineering are summarized and discussed. Based on the lessons, the possible strategies, methods, and research directions are proposed to further improve voltage and FF for ideal PCEs.

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Section: Introductionmentioning

confidence: 99%

Methodologies for >30% Efficient Perovskite Solar Cells via Enhancement of Voltage and Fill Factor

Chen

Park

2021

Solar RRL

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“…[28][29][30] To simultaneously passivate GB defects and enhance water resistance, other more hydrophobic wide-bandgap semiconductor materials should be in situ constructed at GBs. [31] In this work, we in situ construct an ultrathin GB passivation layer consisting of K þ and/or PbSO 4 , which is achieved by incorporating K 2 SO 4 into the perovskite precursor solution. The selfformed GB passivation layer results in multiple functions, including crystallization improvement, defect passivation, and moisture stability enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…[ 28–30 ] To simultaneously passivate GB defects and enhance water resistance, other more hydrophobic wide‐bandgap semiconductor materials should be in situ constructed at GBs. [ 31 ]…”

Section: Introductionmentioning

confidence: 99%

Self‐Formed Multifunctional Grain Boundary Passivation Layer Achieving 22.4% Efficient and Stable Perovskite Solar Cells

Wang

Zhou

et al. 2021

Solar RRL

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The deep‐level defects at grain boundary (GB) result in serious trap‐assisted non‐radiative recombination. Moreover, the degradation of perovskite films is preferentially triggered by the attack of GBs by water and/or oxygen. Therefore, it is urgently needed to develop a multifunctional GB tailoring strategy to address the abovementioned issues. Herein, a self‐formed multifunctional GB passivation strategy is reported, where an ultrathin GB passivation layer is in situ constructed via incorporating K2SO4 into perovskite precursor solution. The self‐formed GB passivation layer plays multiple functions, including crystallization improvement, defect passivation, and moisture resistance. The GB manipulation strategy endows perovskite films reduced defect density, boosted carrier lifetime, and thus suppressed non‐radiative recombination, which contributes to efficiency enhancement from 20.39% to 22.40%. The GB tailoring approach makes the unencapsulated target device exhibit no degradation while the control device degrades to 93% of its initial power conversion efficiency after 1200 h ambient exposure with a relative humidity of 10–20%. The modified device maintains 98% of its original efficiency after aging at 60 °C for 1200 h, whereas only 89% for the control device. Herein, the importance of developing an in situ GB modification strategy in enhancing performance of perovskite photovoltaics is highlighted.

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“…Organic–inorganic metal halide-based perovskite solar cells (PSCs) have received widespread attention since their first demonstration in 2009. , Their easy manufacturing and attractive optoelectronic properties have made PSCs exhibit great potential as a new generation of photovoltaic cells. , However, the solid solution process is easy to produce pinholes and defects on the grain boundary or surface of the deposited polycrystalline perovskite films, causing hysteresis and degradation, thus resulting in the lower performance and stability. − The reduction of defects in the bulk and at the grain boundaries of the perovskite film and the electrical interfaces has attracted interest. Nowadays, the inevitable path for reducing the non-radiative recombination loss caused by defects and improving environmental stability is exploring new perovskite with better intrinsic stability.…”

Section: Introductionmentioning

confidence: 99%

3-Ammonium Propionic Acid: A Cation Tailoring Crystal Structure of Hybrid Perovskite for Improving Photovoltaic Performance

Gao

Yang

et al. 2021

ACS Appl. Energy Mater.

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Defects in the perovskite photoactive layer will cause severe non-radiative recombination and lead to severe efficiency loss and stability degradation. In this work, a type of cation, 3-APA + , was added to the perovskite precursor to passivate the cation defect and interface/surface defects. Our results reveal that incorporating 3-APA + with amino and carboxyl functional groups could enhance electronic properties of the interfacial and bulk due to a more efficient charge transfer between the bulk and interfaces and the reduced electronic defect energy levels. The hybrid cation-based perovskite film exhibits a longer photoluminescence lifetime and a lower density of trap states, indicating the effectively passivated vacancies, thus reducing the nonradiative recombination pathway. In addition, the bifunctional group can cross-link the perovskite grains through hydrogen bonds to form a dense perovskite film with a larger grain size. Consequently, the best performing devices with an optimized power conversion efficiency of 20.4% showed an efficiency loss of only 7% at a maximum power tracking of 2000 s at full sunlight intensity. Therefore, directly adding 3-APA + to the precursor can provide ideas for passivating defects in the perovskite material and improving its stability.

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Grain boundary defect passivation by in situ formed wide-bandgap lead sulfate for efficient and stable perovskite solar cells

Cited by 40 publications

References 44 publications

Methodologies for >30% Efficient Perovskite Solar Cells via Enhancement of Voltage and Fill Factor

Methodologies for >30% Efficient Perovskite Solar Cells via Enhancement of Voltage and Fill Factor

Self‐Formed Multifunctional Grain Boundary Passivation Layer Achieving 22.4% Efficient and Stable Perovskite Solar Cells

3-Ammonium Propionic Acid: A Cation Tailoring Crystal Structure of Hybrid Perovskite for Improving Photovoltaic Performance

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