Base-Activated Reduction of Aromatic Compounds with Dihydrogen

and, Shiyong Yang; Stock, Leon M.

doi:10.1021/ef9502259

Cited by 43 publications

(58 citation statements)

References 8 publications

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“…In previous studies, Yang et al reported that moisture‐assisted perovskite crystal growth could obtain large grain size, which is derived from the moisture accumulation of moisture within GBs . In recent studies, the degradation of perovskite films is initially related to the GBs in perovskite films when they are exposed to moisture and oxygen . These results indicate that moisture‐induced grain degradation is the main reason leading to degradation of perovskite films.…”

Section: Resultsmentioning

confidence: 98%

“…Grain boundaries (GBs) in the perovskite thin films significantly affect the charge transport, recombination dynamic process, and device performance . Besides, owing to the ionic character of solution‐processed perovskite semiconductor, the inherent ionic defects in the perovskite could also bring some undesired issues, such as hysteresis behavior, and device instability . In this regard, defect‐induced electronic trap states at perovskite surface and GBs should be minimized to realize optimal device performance.…”

Section: Introductionmentioning

confidence: 99%

“…The perovskite degradation stems from water/oxygen molecules intrusion through perovskite film surface can be relieved via interface engineering . Moreover, recent studies show that moisture‐sensitive defects at grain boundaries play an important role in triggering the moisture‐induced degradation process . Wang et al demonstrated that a molecular passivation of perovskite films utilizing amine functional molecules could both enhance the device stability and performance.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…[164] Previous study showed that the degradation of perovskite grains was initialized by the defective surface and grain boundaries, while some single crystals with low surface defect density and no grain boundaries could be stable in air for several years. [166] The defects could initialize the permeation of moisture or oxygen into the perovskite films to accelerate the degradation of perovskite devices. Thus, it is highly desirable to electronically passivate the defects at grain boundaries to heal these defects to prolong the durability of PVSCs, such as PEAI surface passivation of the perovskite grain boundaries.…”

Section: Wwwadvenergymatdementioning

confidence: 99%

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Yang

Meng

Yang

2017

Advanced Energy Materials

374

265

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Organic‐inorganic halide perovskite materials have become a shining star in the photovoltaic field due to their unique properties, such as high absorption coefficient, optimal bandgap, and high defect tolerance, which also lead to the breathtaking increase in power conversion efficiency from 3.8% to over 22% in just seven years. Although the highest efficiency was obtained from the TiO2 mesoporous structure, there are increasing studies focusing on the planar structure device due to its processibility for large‐scale production. In particular, the planar p‐i‐n structure has attracted increasing attention on account of its tremendous advantages in, among other things, eliminating hysteresis alongside a competitive certified efficiency of over 20%. Crucial for the device performance enhancement has been the interface engineering for the past few years, especially for such planar p‐i‐n devices. The interface engineering aims to optimize device properties, such as charge transfer, defect passivation, band alignment, etc. Herein, recent progress on the interface engineering of planar p‐i‐n structure devices is reviewed. This review is mainly focused on the interface design between each layer in p‐i‐n structure devices, as well as grain boundaries, which are the interfaces between polycrystalline perovskite domains. Promising research directions are also suggested for further improvements.

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“…Recently, it has been shown that improvements in crystallinity and larger grain sizes can impact the stability of the perovskite thin film. [31,32] Using a precursor solution with an optimized colloidal distribution, we fabricated planar heterojunction n-i-p perovskite solar cells, demonstrating current-voltage determined power conversion efficiencies of over 18.8%, and a stabilized efficiency of 17.9%.…”

mentioning

confidence: 99%

Crystallization Kinetics and Morphology Control of Formamidinium–Cesium Mixed‐Cation Lead Mixed‐Halide Perovskite via Tunability of the Colloidal Precursor Solution

et al. 2017

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spin-coating, [2,3] two-step interdiffusion, [4] dip-coating, [4] inkjet printing, [5,6] and spray pyrolysis. [7] These solution-based fabrication methods of perovskite films have been used in a variety of devices ranging from field-effect transistors, [8] light-emitting devices (LED), [9] photodetectors, [10,11] to solar cells. [2][3][4]12] Although most perovskite thin films are fabricated using a saltbased precursor solution, little effort has been dedicated to characterizing the structure and time-dependent evolution of the species present in solution and the impact this has on the quality of the resulting films. Furthermore, it has been shown that additives to the precursor solution can impact the nucleation rate, morphology, grain size, and crystallinity of the perovskite. Additives, such as polymers, [13] small molecules, [14,15] metal ions, [16] water, [17] or acids, [18][19][20][21][22][23][24] can play a vital role in material quality, enabling improvements in material stability, optoelectronic properties, and photovoltaic performance.Work by Yan et al. characterized the 1:1 CH 3 NH 3 I:PbI 2 stoichiometric precursor solution as a colloidal dispersion in a mother solution, rather than a pure solution. [25] When fabricated on planar substrate, this colloidal solution forms films with poor morphology, due to the presence of rodshaped colloids comprised of a soft coordination complex in the form of a lead polyhalide framework. [25] The authors show that the colloid distribution can be tuned by varying the organic to inorganic compound ratio in the precursor solution, using excess CH 3 NH 3 I (MAI) and CH 3 NH 3 Cl (MACl). However, the authors were unable to remove the 1D PbI 2 rod-like structures in the widely used stoichiometric 1:1 precursor solution. Adding excess organic cation to dissolve these colloids may be incompatible with recently published mixed-cation perov skites that contain both organic and inorganic cations, [26][27][28][29] since this will alter the precise [HC(NH 2 ) 2 ] + (formamidinium, FA) to Cs ratio, which is required to form the appropriate perovskite composition. In addition, FAI has a lower effective volatility than MACl, for instance, and hence excess quantities will not be so readily removed. Herein, we address this problem by utilizing acidic additives to trigger the dissolution of the Perovskite Solar CellsIn recent years, metal halide perovskite solar cells have gained tremendous attention, reaching certified efficiencies of 22.1% power conversion efficiency. [1] This rapid success is partly due to a versatile solution-based fabrication process which allows for a wide range of deposition techniques such as:

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Base-Activated Reduction of Aromatic Compounds with Dihydrogen

Cited by 43 publications

References 8 publications

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

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

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Crystallization Kinetics and Morphology Control of Formamidinium–Cesium Mixed‐Cation Lead Mixed‐Halide Perovskite via Tunability of the Colloidal Precursor Solution

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