Low‐Dimensional Dion–Jacobson‐Phase Lead‐Free Perovskites for High‐Performance Photovoltaics with Improved Stability

Li, Pengwei; Liu, Xiaolong; Zhang, Yiqiang; Liang, Chao; Chen, Gangshu; Li, Fengyu; Su, Meng; Xing, Guichuang; Tao, Xiaofeng; Song, Yanlin

doi:10.1002/anie.202000460

Cited by 148 publications

(138 citation statements)

References 41 publications

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“…Besides, the obvious red-shift of emission peaks also indicates the reduced non-radiative recombination. [28] The following exponential Equations (1) and (2) were…”

Section: Resultsmentioning

confidence: 99%

“…The perovskite solar cell (PSC) has achieved a recordbreaking power conversion efficiency (PCE) of 25.2 %, [1] which benefits from the tunable band gap, high absorption coefficient, and carrier mobility of perovskite. [2] Even though the PSC has achieved the excellent PCE, the stability is still one of the most critical issues for its industrialization and commercialization. [3] As we all know, the PCE and stability of devices are closely related to the crystallization quality of perovskite films.…”

Section: Introductionmentioning

confidence: 99%

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An Efficient and Stable Perovskite Solar Cell with Suppressed Defects by Employing Dithizone as a Lead Indicator

Hou

Han

et al. 2020

Angew Chem Int Ed

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The defects in perovskite films are one of the most non-negligible factors that can attenuate the performances of perovskite solar cell. This work fabricates defect-reduced perovskite film by using the lead indicator (dithizone) as an additive of perovskite functional layer. The dithizone can retard the crystallization rate of perovskite films, passivate the defects, and enhance the structure stability of perovskite by coordinating with lead atoms. As a result, the device doped with dithizone yields outstanding power conversion efficiency and stability.

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“…Besides, the obvious red-shift of emission peaks also indicates the reduced non-radiative recombination. [28] The following exponential Equations (1) and (2) were…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Efficient and Stable Perovskite Solar Cell with Suppressed Defects by Employing Dithizone as a Lead Indicator

Hou

Han

et al. 2020

Angew Chem Int Ed

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“…[165] Unfortunately, the performance of the Sn-based system is markedly inferior to those featuring toxic Pb salts, and Sn 2+ is easily oxidized to tetravalent Sn 4+ when in contact with oxygen, which is not conducive to the stable presence of Sn-based perovskite. The special structure of 2D perovskite can effectively improve the stability of Sn-based PSCs, [166,167] discussed in Section 3.2. For Sn-based perovskites, reducing the dimension allows the organic layer to serve as a barrier layer, adjust the crystal orientation, and obtain higher device efficiency (Figure 8c).…”

Section: Lead-free 2d Perovskite Solar Cellsmentioning

confidence: 99%

Crystallization Kinetics in 2D Perovskite Solar Cells

Wang

Lei

et al. 2020

Advanced Energy Materials

149

124

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volatile decomposition [23] or halide segregation are often observed in hybrid perovskites under various stress conditions (light, [24] thermal, [25] and electric fields [26]); 4) spontaneous phase transition easily occurs for perovskite with unstable crystal structures, particularly for inorganic perovskite. [27-29] To improve the stability of PSCs, researchers attempted numerous methods such as encapsulation, [30] additive engineering, [31] component engineering, [32] etc. [33] However, the PSCs' stability is yet to achieve a perfect solution. Recently, researchers found that the introduction of long-chain organic cations in 3D perovskite as 2D perovskite can block water and oxygen molecules, meanwhile, generate a steric effect to prevent phase transitions, and limit ion migration. [34-36] Hence, fabricating 2D [37,38] or 2D/3D [39-43] mixed perovskite as absorbing layers are effective approaches to improve the stability of PSCs. However, the PCE of 2D PSCs remain lower than that of the 3D ones, which is mainly attributed to the introduction of organic macromolecules that blocks the effective extraction and transport of carriers. [44,45] Fortunately, 2D perovskite usually has three arrangements, namely parallel, perpendicular to the glass substrate or randomly arranged. [46] Manipulating the orientation of the crystal and the phase distribution in the 2D solution-processed perovskite can improve the efficiency and reproducibility of the device. Among them, the most desired arrangement for PSCs is the one that perpendicular to the substrate. Therefore, studying the crystallization kinetics of 2D perovskite is curial to effectively control the film forming process and adjust the crystal orientation (perpendicular to the substrate), which can effectively avoid or reduce the adverse effects of the organic molecular layer and improve device efficiency. [47,48] Nevertheless, few review articles were published on this subject. In this review, we mainly focus on the key issue for controlling crystallization kinetics and summarizing the research progress of their effects on various types of 2D PSCs. We also discuss the crystal/natural quantum well (QW) structure and the original stability for 2D PSCs in detail. Finally, remaining challenges and outlooks are presented. 2. Crystal and Natural Quantum Well Structure The material structure has a substantial impact on performance. [49-51] Properties of 2D and 3D perovskites differ 2D perovskites demonstrate higher moisture stability, oxygen content, thermal stability, and a significantly lower ion migration/phase transition occurrence in comparison to 3D perovskite. These advantages imply huge potential for 2D perovskite in commercial applications in the photovoltaic field. However, the horizontal arrangement of the organic layer severely hinders the transport of carriers, and thus, the power conversion efficiency of 2D perovskite solar cells (PSCs) is significantly lower than that of 3D. Controlling the crystallization orientation to achieve rapid carrier transport can effe...

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“…In order to suppress the Sn 2+ oxidation of tin halide perovskites, increasing efforts have been made to improve the photovoltaic performance and stability of tin halide‐based PSCs. [ 18–43 ] Some potential strategies to inhibit the oxidation of Sn 2+ mainly include the introducing of reductant additives into perovskite precursor solutions, [ 18–21 ] composition engineering of alloying cations or anions, [ 23–27 ] adopting low‐dimensional perovskites, [ 28,29 ] and etc. Because it owns the suitable bandgap (1.3–1.4 eV) and superior optoelectronic properties, formamidinium tin triiodide perovskite (FASnI 3 ) is deemed as one of the most promising candidates to enable high‐performance tin halide based PSCs.…”

Section: Introductionmentioning

confidence: 99%

Oriented Crystallization of Mixed‐Cation Tin Halides for Highly Efficient and Stable Lead‐Free Perovskite Solar Cells

Liao

Zhu

et al. 2020

Adv Funct Materials

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As the most promising lead‐free branch, tin halide perovskites suffer from the severe oxidation from Sn2+ to Sn4+, which results in the unsatisfactory conversion efficiency far from what they deserve. In this work, by facile incorporation of methylammonium bromide in composition engineering, formamidinium and methylammonium mixed cations tin halide perovskite films with ultrahighly oriented crystallization are synthesized with the preferential facet of (001), and that oxidation is suppressed with obviously declined trap density. MA+ ions are responsible for that impressive orientation while Br‐ ions account for their bandgap modulation. Depending on high quality of the optimal MA0.25FA0.75SnI2.75Br0.25 perovskite films, their device conversion efficiency surges to 9.31% in contrast to 5.02% of the control formamidinium tin triiodide perovskite (FASnI3) device, along with almost eliminated hysteresis. That also results in the outstanding device stability, maintaining above 80% of the initial efficiency after 300 h of light soaking while the control FASnI3 device fails within 120 h. This paper definitely paves a facile and effective way to develop high‐efficiency tin halide perovskites solar cells, optoelectronic devices, and beyond.

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Low‐Dimensional Dion–Jacobson‐Phase Lead‐Free Perovskites for High‐Performance Photovoltaics with Improved Stability

Cited by 148 publications

References 41 publications

An Efficient and Stable Perovskite Solar Cell with Suppressed Defects by Employing Dithizone as a Lead Indicator

An Efficient and Stable Perovskite Solar Cell with Suppressed Defects by Employing Dithizone as a Lead Indicator

Crystallization Kinetics in 2D Perovskite Solar Cells

Oriented Crystallization of Mixed‐Cation Tin Halides for Highly Efficient and Stable Lead‐Free Perovskite Solar Cells

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