Trash into Treasure: δ‐FAPbI<sub>3</sub> Polymorph Stabilized MAPbI<sub>3</sub> Perovskite with Power Conversion Efficiency beyond 21%

Zhang, Yi; Zhou, Zhongmin; Ji, Fuxiang; Li, Zhipeng; Cui, Guanglei; Gao, Peng; Oveisi, Emad; Nazeeruddin, Mohammad Khaja; Pang, Shuping

doi:10.1002/adma.201707143

Cited by 108 publications

(109 citation statements)

References 42 publications

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“…Perovskite solar cells (PSCs) have been investigated extensively in the past five years as a promising alternative to conventional silicon solar cells . The highest identified power conversion efficiency (PCE) of PSCs has been achieved to 24.2% .…”

Section: Introductionmentioning

confidence: 99%

FAPbI₃ Flexible Solar Cells with a Record Efficiency of 19.38% Fabricated in Air via Ligand and Additive Synergetic Process

Wang

Zhang

et al. 2019

Adv Funct Materials

105

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Compared with silicon-based solar cells, organic-inorganic hybrid perovskite solar cells (PSCs) possess a distinct advantage, i.e., its application in the flexible field. However, the efficiency of the flexible device is still lower than that of the rigid one. First, it is found that the dense formamidinium (FA)-based perovskite film can be obtained with the help of N-methyl-2pyrrolidone (NMP) via low pressure-assisted method. In addition, CH 3 NH 3 Cl (MACl) as the additive can preferentially form MAPbCl 3−x I x perovskite seeds to induce perovskite phase transition and crystal growth. Finally, by using FAI·PbI 2 ·NMP+x%MACl as the precursor, i.e., ligand and additive synergetic process, a FA-based perovskite film with a large grain size, high crystallinity, and low trap density is obtained on a flexible substrate under ambient conditions due to the synergetic effect, e.g., MACl can enhance the crystallization of the intermediate phase of FAI·PbI 2 ·NMP. As a result, a record efficiency of 19.38% in flexible planar PSCs is achieved, and it can retain about 89% of its initial power conversion efficiency (PCE) after 230 days without encapsulation under ambient conditions. The PCE retains 92% of the initial value after 500 bending cycles with a bending radii of 10 mm. The results show a robust way to fabricate highly efficient flexible PSCs.

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Section: Introductionmentioning

confidence: 99%

FAPbI₃ Flexible Solar Cells with a Record Efficiency of 19.38% Fabricated in Air via Ligand and Additive Synergetic Process

Wang

Zhang

et al. 2019

Adv Funct Materials

105

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“…Meanwhile, CH 3 NH 2 gas treatment can help reduce the defect density in perovskite films 19,20 and also elimination of I 2 13 . Besides, CH 3 NH 2 -induced δ-NH 2 CH=NH 2 PbI 3 in (CH 3 NH 3 ) x (NH 2 CH=NH 2 ) 1− x PbI 3 is also reported to passivate trap states to improve device performance 21 . Moreover, excess solvent is absent during this perovskite formation process, which avoids the possible detrimental effect-related residue solvent.…”

Section: Introductionmentioning

confidence: 99%

Gas-solid reaction based over one-micrometer thick stable perovskite films for efficient solar cells and modules

et al. 2018

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Besides high efficiency, the stability and reproducibility of perovskite solar cells (PSCs) are also key for their commercialization. Herein, we report a simple perovskite formation method to fabricate perovskite films with thickness over 1 μm in ambient condition on the basis of the fast gas−solid reaction of chlorine-incorporated hydrogen lead triiodide and methylamine gas. The resultant thick and smooth chlorine-incorporated perovskite films exhibit full coverage, improved crystallinity, low surface roughness and low thickness variation. The resultant PSCs achieve an average power conversion efficiency of 19.1 ± 0.4% with good reproducibility. Meanwhile, this method enables an active area efficiency of 15.3% for 5 cm × 5 cm solar modules. The un-encapsulated PSCs exhibit an excellent T80 lifetime exceeding 1600 h under continuous operation conditions in dry nitrogen environment.

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“…Secondly, oxygen escape is avoided in TiO 2 under the UV light, as showed in Figure c. Thirdly, increased conduction band of the ETL leads to more highly charge transport, lower recombination rates, and higher V oc …”

Section: Resultsmentioning

confidence: 97%

Simultaneously Enhanced Efficiency and Stability of Perovskite Solar Cells with TiO₂@CdS Core–Shell Nanorods Electron Transport Layer

Liu

Chu

Liu

et al. 2019

Adv Materials Inter

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Both demands of stability and efficiency constitute the gargantuan barriers of perovskite solar cells (PSCs), hampering the academic communities and industrial production. Herein, it is demonstrated that, after depositing optimized CdS shell layers on TiO2 nanorod arrays (NAs) by a simple and rapid chemical bath method at room temperature, the efficiency and stability of PSCs are simultaneously enhanced. The PSCs based on TiO2/CdS core–shell NAs achieve higher power conversion efficiency up to 17.71%, compared to 15.93% of the pristine TiO2 NAs‐based cells. Especially, the stability of the PSCs is prominently improved after optimized CdS layer modification without encapsulation. The significant enhancement of both efficiency and stability are mainly ascribed to that the type‐II structure of TiO2/CdS coaxial nanorods can suppress recombination, and the oxygen vacancies on TiO2 surfaces are not directly contacted with perovskite layers. The surface modification on TiO2 NAs opens up an alternative approach toward improving the performance and stability of PSCs.

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Trash into Treasure: δ‐FAPbI₃ Polymorph Stabilized MAPbI₃ Perovskite with Power Conversion Efficiency beyond 21%

Cited by 108 publications

References 42 publications

FAPbI₃ Flexible Solar Cells with a Record Efficiency of 19.38% Fabricated in Air via Ligand and Additive Synergetic Process

FAPbI₃ Flexible Solar Cells with a Record Efficiency of 19.38% Fabricated in Air via Ligand and Additive Synergetic Process

Gas-solid reaction based over one-micrometer thick stable perovskite films for efficient solar cells and modules

Simultaneously Enhanced Efficiency and Stability of Perovskite Solar Cells with TiO₂@CdS Core–Shell Nanorods Electron Transport Layer

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Trash into Treasure: δ‐FAPbI3 Polymorph Stabilized MAPbI3 Perovskite with Power Conversion Efficiency beyond 21%

Cited by 108 publications

References 42 publications

FAPbI3 Flexible Solar Cells with a Record Efficiency of 19.38% Fabricated in Air via Ligand and Additive Synergetic Process

FAPbI3 Flexible Solar Cells with a Record Efficiency of 19.38% Fabricated in Air via Ligand and Additive Synergetic Process

Gas-solid reaction based over one-micrometer thick stable perovskite films for efficient solar cells and modules

Simultaneously Enhanced Efficiency and Stability of Perovskite Solar Cells with TiO2@CdS Core–Shell Nanorods Electron Transport Layer

Contact Info

Product

Resources

About

Trash into Treasure: δ‐FAPbI₃ Polymorph Stabilized MAPbI₃ Perovskite with Power Conversion Efficiency beyond 21%

FAPbI₃ Flexible Solar Cells with a Record Efficiency of 19.38% Fabricated in Air via Ligand and Additive Synergetic Process

FAPbI₃ Flexible Solar Cells with a Record Efficiency of 19.38% Fabricated in Air via Ligand and Additive Synergetic Process

Simultaneously Enhanced Efficiency and Stability of Perovskite Solar Cells with TiO₂@CdS Core–Shell Nanorods Electron Transport Layer