Organic-cation-mixed (FA,MA)PbI3 through sequential vapor growth for planar perovskite solar cells

Choi, Won‐Gyu; Na, Sungjae; Park, Chan-Gyu; Moon, Taeho

doi:10.1016/j.solener.2018.11.061

Cited by 22 publications

(15 citation statements)

References 28 publications

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“…Although there are many vapor deposition processes, most fall into one of two categories: single-step processes such as coevaporation, [7][8][9] and sequential, deposition-plus-reaction processes. [10][11][12][13] In coevaporation systems, it has proven difficult to control the flux of volatile organic reactants such as methylammonium iodide (MAI) using, for example, quartz crystal microbalance (QCM) technology. [11,[14][15][16] This is due to the high vapor pressure and low sticking coefficient of MAI, such that it does not obey line-of-sight mass transport nor does it deposit uniformly on the QCM surface.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Structural Characterization of Methylammonium‐ and Formamidinium‐Halide Salts

Harding

Dobson

Ogunnaike

et al. 2021

Physica Status Solidi (a)

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Four organic halide salts of interest to alloyed perovskite solar cell fabrication are characterized using attenuated total reflectance Fourier transform infrared spectroscopy (ATR‐FTIR), powder X‐ray diffraction (XRD), and thermogravimetric analysis. The chemical and crystal structures of methylammonium iodide (MAI), methylammonium bromide (MABr), and formamidinium iodide (FAI) are confirmed, and the experimental ATR‐FTIR spectrum and XRD pattern of formamidinium bromide (FABr) are presented. The enthalpy, ΔH vap, and entropy, ΔS vap, of vaporization are quantified for each salt and are used to estimate their vapor pressures in the temperature range of 150–300 °C. MAI, MABr, and FAI have similar vapor pressures in this temperature range, whereas FABr has a higher vapor pressure in the temperature range of 150–240 °C. These data provide a foundation for achieving effective control of vapor phase concentrations for vapor processing of alloyed perovskite solar cells.

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Section: Introductionmentioning

confidence: 99%

Thermal and Structural Characterization of Methylammonium‐ and Formamidinium‐Halide Salts

Harding

Dobson

Ogunnaike

et al. 2021

Physica Status Solidi (a)

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“…Compared with solution processing, vapor processing offers advantages such as a uniform film morphology without the use of additives, accurate thickness control, and easy multilayer film formation. 22,23 Despite these advantages, few studies using vapor processing to fabricate Sn-based perovskites have been reported; in addition, research related to low-dimensional perovskites has been extremely limited even in the case of Pbbased materials. Here, we introduce a bilayer structure of 2D PEA 2 SnI 4 and 3D MASnI 3 (MA = methylammonium) perovskites formed using a sequential vapor process that combines vacuum deposition and vapor reaction.…”

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confidence: 99%

Sn Perovskite Solar Cells via 2D/3D Bilayer Formation through a Sequential Vapor Process

et al. 2020

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Sn-based perovskite solar cells are attracting great attention because of their potential for efficiency enhancement and their relative eco-friendliness compared with Pb-based perovskite solar cells. The main challenges lie in improving the oxidation stability and ensuring a uniform morphology of the Snbased perovskite films. Here, we introduce a bilayer structure of 2D PEA 2 SnI 4 and 3D MASnI 3 perovskite (PEA = phenethylammonium; MA = methylammonium) formed by a sequential vapor process that combines vacuum deposition and vapor reaction. The vapor process ensures that the perovskite thin films are uniform and enables the fabrication of an upper layer with fine thickness control without damaging the lower layer. With the introduction of the 2D layer, Sn oxidation is suppressed and the crystallinity of the 3D layer is enhanced. A planar-type solar cell fabricated using the optimized 2D/3D structure exhibits an average efficiency of 9.2 ± 0.2%.

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“…Figure 5D shows the plots of Nyquist PSCs that are FAI post-dripped, with different concentration lead sources at DC bias voltage of 0.9 V. The semi-circle in the lower-frequency range is due to the recombination resistance (R rec ) between both the perovskite layer and the ETL, which is inversely associated with the photo-generated recombination rate. 53 High frequency semicircle generated by the R ct on selective contact layer/perovskite interfaces, and R s is regarded to be electrode resistance and the external circuit series resistance correspondingly. The key aspect under consideration is the combination process.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous work we achieved the PCE of 17.50% with 10 days stability (75% of PCE) by dripping 15 M solution of FAI on MAPbI 3 perovskite. 53 Here in, we introduced less amount of FAI and achieved the PCE up to 17.52% and devices retained their more than 78% of PCE after 20 days.…”

Section: Introductionmentioning

confidence: 82%

Formamidinium post‐dripping on methylammonium lead iodide to achieve stable and efficient perovskite solar cells

Syed

Khan

Ahmad

et al. 2021

Intl J of Energy Research

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Formamidinium iodide (FAI) based perovskite solar cells (PSCs) have now been established as effective PSCs than methylammonium lead iodide perovskite for several years due to their optimal bandgap and high thermal stability.However, the FAI-based PSCs have humidity issues, due to which mixed cation perovskites are getting popular. MAI-based PSCs have better stability against high humidity but low thermal stabilities. Herein, we prepared highly crystallized, efficient, and large-grain size perovskite films via FAI postdripping process. In addition, the most promising structures FAI mixed MAPbI 3 were explored as stable and effective active layers. The post-dripping of FAI solution just after the MAPbI 3 deposition provides a robust longdistance diffusion, long carrier life, and enhanced grain sizes when compared to MAPbI 3 PSCs. Based on the facile way of mixed cation perovskite preparation by post-dripping, the power conversion efficiency (PCE) has risen from 15.24% to 17.52% in comparison with the pristine devices. This results in the best quality and large grain perovskite films which enhanced the PSCs' performance by reducing defect density and regulating the crystallization rate.

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Organic-cation-mixed (FA,MA)PbI3 through sequential vapor growth for planar perovskite solar cells

Cited by 22 publications

References 28 publications

Thermal and Structural Characterization of Methylammonium‐ and Formamidinium‐Halide Salts

Thermal and Structural Characterization of Methylammonium‐ and Formamidinium‐Halide Salts

Sn Perovskite Solar Cells via 2D/3D Bilayer Formation through a Sequential Vapor Process

Formamidinium post‐dripping on methylammonium lead iodide to achieve stable and efficient perovskite solar cells

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