Synergistic effect of additives on 2D perovskite film towards efficient and stable solar cell

Zheng, Hualin; Liu, Detao; Wang, Yafei; Yang, Yingguo; Li, Hao; Zhang, Ting; Chen, Hao; Ji, Long; Chen, Zhi

doi:10.1016/j.cej.2020.124266

Cited by 56 publications

(38 citation statements)

References 43 publications

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“…In the crystallization process of 2D perovskite films, a large number of nucleation make the crystallization process difficult to control and lead to random orientation. [113] However, Figure 4. a) Formation of solvent complexes (blue segmented rhomboid), which disintegrate partially to provide a framework for the nucleation (bottom right at each stage) and growth (left/top) of the 2D perovskites during the annealing process.…”

Section: Solvent Engineeringmentioning

confidence: 98%

Crystallization Kinetics in 2D Perovskite Solar Cells

Wang

Lei

et al. 2020

Advanced Energy Materials

133

121

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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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Section: Solvent Engineeringmentioning

confidence: 98%

Crystallization Kinetics in 2D Perovskite Solar Cells

Wang

Lei

et al. 2020

Advanced Energy Materials

133

121

View full text Add to dashboard Cite

show abstract

“…It can be seen that the G-MAPbI x Br 3 − x sample has the shortest carrier lifetime. As we know, material quality can also impact the carrier lifetime, and a poor quality will result in a short carrier lifetime [41][42][43]. According to our XRD results shown in Fig.…”

Section: Resultsmentioning

confidence: 73%

Gradient Engineered Light Absorption Layer for Enhanced Carrier Separation Efficiency in Perovskite Solar Cells

Zhu

Zhang

et al. 2020

Nanoscale Res Lett

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Carrier transport behavior in the perovskite light absorption layer significantly impacts the performance of perovskite solar cells (PSCs). In this work, reduced carrier recombination losses were achieved by the design of a band structure in perovskite materials. An ultrathin (PbI 2 /PbBr 2) n film with a gradient thickness ratio was deposited as the lead halide precursor layer by a thermal evaporation method, and PSCs with a gradient band structure in the perovskite absorption layer were fabricated by a two-step method in ambient atmosphere. For comparison, PSCs with homogeneous perovskite materials of MAPbI 3 and MAPbI x Br 3 − x were fabricated as well. It is found that the gradient type-II band structure greatly reduces the carrier lifetime and enhances the carrier separation efficiency. As a result, the PSCs with a gradient band structure exhibit an average power conversion efficiency of 17.5%, which is 1-2% higher than that of traditional PSCs. This work provides a novel method for developing high-efficiency PSCs.

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“…It can be seen that the G-MAPbIxBr3-x sample has the shortest carrier lifetime. As we know, material quality can also impact the carrier lifetime, and a poor quality will result in a short carrier lifetime [41][42][43]. According to our XRD results shown in Fig.…”

Section: Resultsmentioning

confidence: 73%

Gradient engineered light absorption layer for enhanced carrier separation efficiency in perovskite solar cells

Zhu

Zhang

et al. 2020

Preprint

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Carrier transport behavior in perovskite light absorption layer significantly impacts the performance of perovskite solar cells (PSCs). In this work, reduced carrier recombination losses were achieved by the design of band structure in perovskite materials. An ultrathin (PbI2/PbBr2)n film with a gradient thickness ratio was deposited as the lead halide precursor layer by thermal evaporation method, and PSCs with a gradient band structure in perovskite absorption layer were fabricated by a two-step method in ambient atmosphere. For comparison, PSCs with homogeneous perovskite materials of MAPbI3 and MAPbIxBr3-x were fabricated as well. It is found that the gradient type-II band structure greatly reduces the carrier lifetime and enhances the carrier separation efficiency. As a result, the PSCs with a gradient band structure exhibit an average power conversion efficiency of 17.5%, which is 1-2% higher than that of traditional PSCs. This work provides a novel method for developing high-efficient PSCs.

show abstract

Synergistic effect of additives on 2D perovskite film towards efficient and stable solar cell

Cited by 56 publications

References 43 publications

Crystallization Kinetics in 2D Perovskite Solar Cells

Crystallization Kinetics in 2D Perovskite Solar Cells

Gradient Engineered Light Absorption Layer for Enhanced Carrier Separation Efficiency in Perovskite Solar Cells

Gradient engineered light absorption layer for enhanced carrier separation efficiency in perovskite solar cells

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