Material nucleation/growth competition tuning towards highly reproducible planar perovskite solar cells with efficiency exceeding 20%

Ding, Bin; Li, Yan; Huang, Shi-Yu; Chu, Qian-Qian; Li, Chang-Jiu

doi:10.1039/c7ta00027h

Cited by 157 publications

(118 citation statements)

References 40 publications

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“…The spin‐coated film was quickly moved to a low‐pressure chamber pumped to 9 Pa. In this step, the solvent volatilization of the spin‐coated perovskite precursor could be accelerated by low pressure treatment, thereby promoting the crystallization of perovskite . Then it was annealed at 150 °C for 20 min to evaporate the solvent, thus a black perovskite film was obtained with good crystallinity.…”

Section: Resultsmentioning

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

103

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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: Resultsmentioning

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

103

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“…In principle, the Lewis base can effectively passivate the trap states (the under‐coordinated Pb 2+ ) at the perovskite crystals and GBs through donating electrons (Figure c) . In addition, IT‐M, as additives in anti‐solvent (CB), can also influence the nucleation and crystal growth process during the perovskite film formation, which is crucial to obtain high‐quality perovskite films . To verify the role of IT‐M additives in perovskite film formation, the morphology of perovskite films were investigated by scanning electron microscope (SEM).…”

Section: Resultsmentioning

confidence: 99%

A Lewis Base‐Assisted Passivation Strategy Towards Highly Efficient and Stable Perovskite Solar Cells

et al. 2018

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Organo-metal halide hybrid perovskites with mixed cations and halides have become promising photovoltaic materials, showing extraordinary optoelectronic properties and excellent device performance. Herein, an organic semiconducting nonfullerene acceptor (NFA) molecule IT-M is introduced as Lewis base to improve perovskite interfaces. This facile Lewis base-assisted strategy effectively enhances the electronic properties of Cs 0.05 (MA 0.17 FA 0.83 ) 0.95 Pb(I 0.83 Br 0.17 ) 3 thin films, passivates the perovskite surface defects and further boosts the performance of perovskite solar cells. With the reduced surface defects, this approach significantly enhances the charge transport properties and boosts the photogenerated photoluminescence lifetime from 1.46 to 2.20 ms. As a result, the n-i-p planar perovskite solar cell champion efficiency reaches 20.5% with a high FF of 81%. Moreover, the Lewis base molecule IT-M can also passivate the under-coordinated lead ions and enhance the durability of perovskite PbI 6 octahedra framework under an ambient environment with thermal stress and humidity. The results provide a simple while highly effective route of fabricating the high performance and stable planar perovskite solar cells.

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“…[6] Enlightened by the antisolvent approach, we sought to achieve such an intermediate stage via vacuum extraction to remove excess solvent of the freshly deposited wet films. [25,[33][34][35] In combination with additive engineering, Adv. Finally, highly crystallized perovskite films with shiny surface were obtained by annealing the intermediate films at 100 °C for 10 min.…”

Section: Controlled Perovskite Crystallizationmentioning

confidence: 99%

A Generalized Crystallization Protocol for Scalable Deposition of High‐Quality Perovskite Thin Films for Photovoltaic Applications

et al. 2019

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Metal halide perovskite solar cells (PSCs) have raised considerable scientific interest due to their high cost‐efficiency potential for photovoltaic solar energy conversion. As PSCs already are meeting the efficiency requirements for renewable power generation, more attention is given to further technological barriers as environmental stability and reliability. However, the most major obstacle limiting commercialization of PSCs is the lack of a reliable and scalable process for thin film production. Here, a generic crystallization strategy that allows the controlled growth of highly qualitative perovskite films via a one‐step blade coating is reported. Through rational ink formulation in combination with a facile vacuum‐assisted precrystallization strategy, it is possible to produce dense and uniform perovskite films with high crystallinity on large areas. The universal application of the method is demonstrated at the hand of three typical perovskite compositions with different band gaps. P‐i‐n perovskite solar cells show fill factors up to 80%, underpinning the statement of the importance of controlling crystallization dynamics. The methodology provides important progress toward the realization of cost‐effective large‐area perovskite solar cells for practical applications.

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Material nucleation/growth competition tuning towards highly reproducible planar perovskite solar cells with efficiency exceeding 20%

Abstract: Decreasing the crystal growth time and increasing the number of nuclei produced high quality perovskite films toward large-area high-efficiency perovskite solar cells.

Cited by 157 publications

References 40 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

A Lewis Base‐Assisted Passivation Strategy Towards Highly Efficient and Stable Perovskite Solar Cells

A Generalized Crystallization Protocol for Scalable Deposition of High‐Quality Perovskite Thin Films for Photovoltaic Applications

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Material nucleation/growth competition tuning towards highly reproducible planar perovskite solar cells with efficiency exceeding 20%

Abstract: Decreasing the crystal growth time and increasing the number of nuclei produced high quality perovskite films toward large-area high-efficiency perovskite solar cells.

Cited by 157 publications

References 40 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

A Lewis Base‐Assisted Passivation Strategy Towards Highly Efficient and Stable Perovskite Solar Cells

A Generalized Crystallization Protocol for Scalable Deposition of High‐Quality Perovskite Thin Films for Photovoltaic Applications

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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