Crystallization and grain growth regulation through Lewis acid-base adduct formation in hot cast perovskite-based solar cells

Afroz, Mohammad Adil; Gupta, Ritesh Kant; Garai, Rabindranath; Hossain, Maimur; Tripathi, S. Pati; Iyer, Parameswar Krishnan

doi:10.1016/j.orgel.2019.07.007

Cited by 35 publications

(30 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This negatively charged part is expected to interact with the positively charged defects. It can be confirmed from Fourier-transform infrared (FTIR) spectroscopy (Figure d), where the υ CO band of the carboxylate ion of PHIA experienced a considerable shift from 1705 to 1642 cm –1 , indicating sufficient interaction between carboxylate ions and perovskites …”

Section: Resultsmentioning

confidence: 99%

“…It can be confirmed from Fouriertransform infrared (FTIR) spectroscopy (Figure 1d), where the υ CO band of the carboxylate ion of PHIA experienced a considerable shift from 1705 to 1642 cm −1 , indicating sufficient interaction between carboxylate ions and perovskites. 27 The UV−vis absorption spectra of perovskite thin films with different concentrations of PHIA additives were carefully studied (Figure 2a). Initially, a considerable improvement in absorption spectra is observed with the increasing PHIA concentration from 0 (pristine) to 0.50 mg mL −1 PHIA (0.50_PHIA), whereas it weakens at a higher PHIA concentration.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Conjugated Polyelectrolyte-Passivated Stable Perovskite Solar Cells for Efficiency Beyond 20%

et al. 2021

Self Cite

View full text Add to dashboard Cite

Developing large-scale perovskite solar cells requires highquality defect-free perovskite films with improved surface coverage. One of the most convenient ways to achieve this is through the incorporation of appropriate passivation molecules in the perovskite films. Herein, the effect of a novel conjugated polyelectrolyte, PHIA, is investigated for perovskite passivation by the comprehensive analysis of perovskite films and devices. The PHIA polymer significantly diminishes the trap states in perovskite films, and the passivated device permits lesser recombination, very low accumulation of charges at the interface, and lowers the traps which facilitated superior charge transport. As a result, a high power conversion efficiency of 20.17% has been achieved for the PHIA-modified device. Additionally, this passivation approach effectively enhanced the long-term device stability by improving the hydrophobicity of the perovskite layer. Furthermore, a large-area device (2 cm 2 ) has also been fabricated to demonstrate the expediency of this approach for future commercialization.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Conjugated Polyelectrolyte-Passivated Stable Perovskite Solar Cells for Efficiency Beyond 20%

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…These results show that the perovskite layer prepared with OA results in improved operational stability, which is related to the superior morphology obtained with large grains and minimized grain boundaries owing to the fact that the degradation of perovskite films occurs at a much faster rate at grain boundaries. 36…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Numerous attempts have been made to improve the stability of PSCs by achieving a high-quality perovskite layer. Notable improvements have been observed in the crystallinity, surface coverage, and grain size of perovskite films via Ostwald ripening, solvent annealing, solvent engineering, − gas treatment, and through additives. − Among these approaches, additive assisted perovskite crystal growth has been particularly effective to enhance the performance of PSCs as well as its stability. A ligand, 2-aminoethanethiol, was used in the perovskite precursor to interconnect lead iodide (PbI 2 ) and methylammonium iodide (MAI) that led to the simultaneous growth of PbI 2 and MAI crystals and ensured a dense perovskite film with improved stability .…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Performance Enhancement of Perovskite Solar Cells Through Oxalic Acid-Induced Perovskite Formation

Afroz

Ghimire

Reza

et al. 2020

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

Achieving long-term stability along with high power conversion efficiency (PCE) is the biggest obstacle for the pursuit of organic−inorganic perovskite solar cells (PSCs) toward commercialization. Herein, we demonstrate additive assisted perovskite crystal growth as an effective strategy to improve both power conversion efficiency and thermal stability of methylammonium lead triiodide (MAPbI 3 ) perovskite solar cells. For this, oxalic acid (OA) with two bifacial carboxylic acid groups was employed as an additive into the perovskite precursor solution, which facilitated modulating the crystallization process leading to increase in grain size, reduced grain boundaries and trap states. Subsequently, devices fabricated with the OA additive showed a power conversion efficiency of 17.12%, compared to the control device with 14.06%. Furthermore, enhanced thermal stability was achieved for the OA-modified PSCs compared to that of the pristine device. The device without the OA additive retained 14% of the initial PCE after only 9 h of heat treatment at 100 °C, whereas for the same condition, the OA-modified device retained 90% after 9 h and even 70% after 19 h. These observations suggest that OA-assisted morphological improvement of perovskite can offer an efficient approach to further improve the performance as well as stability of the PSCs.

show abstract

“…It was reported that the grain size and photovoltaic parameters of the device from the GBL solvent were significantly lower than those from the DMF solvent [55]. In addition, Iyer et al regulated the perovskite crystallization and grain growth with DMSO as a Lewis base adduct [56].…”

Section: Aging Time and Solventmentioning

confidence: 99%

Hot-Casting Large-Grain Perovskite Film for Efficient Solar Cells: Film Formation and Device Performance

Liao

Xie

et al. 2020

Nano-Micro Lett.

View full text Add to dashboard Cite

Organic–inorganic metal halide perovskite solar cells (PSCs) have recently been considered as one of the most competitive contenders to commercial silicon solar cells in the photovoltaic field. The deposition process of a perovskite film is one of the most critical factors affecting the quality of the film formation and the photovoltaic performance. A hot-casting technique has been widely implemented to deposit high-quality perovskite films with large grain size, uniform thickness, and preferred crystalline orientation. In this review, we first review the classical nucleation and crystal growth theory and discuss those factors affecting the hot-casted perovskite film formation. Meanwhile, the effects of the deposition parameters such as temperature, thermal annealing, precursor chemistry, and atmosphere on the preparation of high-quality perovskite films and high-efficiency PSC devices are comprehensively discussed. The excellent stability of hot-casted perovskite films and integration with scalable deposition technology are conducive to the commercialization of PSCs. Finally, some open questions and future perspectives on the maturity of this technology toward the upscaling deposition of perovskite film for related optoelectronic devices are presented.

show abstract

Crystallization and grain growth regulation through Lewis acid-base adduct formation in hot cast perovskite-based solar cells

Cited by 35 publications

References 49 publications

Conjugated Polyelectrolyte-Passivated Stable Perovskite Solar Cells for Efficiency Beyond 20%

Conjugated Polyelectrolyte-Passivated Stable Perovskite Solar Cells for Efficiency Beyond 20%

Thermal Stability and Performance Enhancement of Perovskite Solar Cells Through Oxalic Acid-Induced Perovskite Formation

Hot-Casting Large-Grain Perovskite Film for Efficient Solar Cells: Film Formation and Device Performance

Contact Info

Product

Resources

About