Thermal degradation of formamidinium based lead halide perovskites into sym-triazine and hydrogen cyanide observed by coupled thermogravimetry-mass spectrometry analysis

  title={Thermal degradation of formamidinium based lead halide perovskites into sym-triazine and hydrogen cyanide observed by coupled thermogravimetry-mass spectrometry analysis},
  author={Emilio Jos{\'e} Ju{\'a}rez-P{\'e}rez and Luis K. Ono and Yabing Qi},
  journal={Journal of Materials Chemistry A},
The thermal stability and decomposition products of formamidinium, a widely used organic cation in perovskite solar cell formulation, were investigated. 
Temperature-Dependent Thermal Decomposition Pathway of Organic–Inorganic Halide Perovskite Materials
The thermal decomposition products and kinetics of two typical organic–inorganic halide perovskites, CH3NH3PbI3 (MAPbI3) and HC(NH2)2PbI3 (FAPbI3), were investigated via simultaneous thermogravimet...
Structural Stability of Formamidinium- and Cesium-Based Halide Perovskites
The certified power conversion efficiency of state-of-the-art organic–inorganic hybrid perovskite solar cells has surpassed 25%, showing promising potential for commercialization. Compared with vol...
Bulk and interfacial decomposition of formamidinium iodide (HC(NH2)2I) in contact with metal oxide
Interfacial reaction between formamidinium iodide and metal oxide transport layer triggers degradation and lower the intrinsic stability which is dictated by the oxide, rather than the perovskite.
Hybrid lead halide [(CH3)2NH2]PbX3(X = Cl−and Br−) hexagonal perovskites with multiple functional properties
[(CH3)2NH2]PbX3(X = Cl−and Br−) hexagonal perovskites exhibit a first order phase transition, dielectric transition and broad red light photoluminescence emission.
Thermal and Structural Characterization of Methylammonium‐ and Formamidinium‐Halide Salts
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
Femtosecond Quantum Dynamics of Excited-State Evolution of Halide Perovskites: Quantum Chaos of Molecular Cations
The excited-state quantum dynamics of the organic cation in hybrid perovskites are investigated using the time-dependent density functional theory. The bond fluctuation reveals that the energy rela...
Optical and dielectric properties of lead perovskite and iodoplumbate complexes: an ab initio study.
It is found that the local coordination environmental changes and noncovalent interactions are crucial in explaining the enthalpy of formation and relative energy stability of organic-inorganic lead halide perovskites.
Substance and shadow of formamidinium lead triiodide based solar cells.
Light is shed on the compositional, surface engineering and crystallization kinetics manipulations for FAPbI3, followed by a proposition for unified testing protocols, for scalling of devices from the lab to the market.
Thermodynamic Study of Formamidinium Lead Iodide (CH5N2PbI3) from 5 to 357 K
In the present study, the molar heat capacity of solid formamidinium lead iodide (CH5N2PbI3) was measured over the temperature range from 5 to 357 K using a precise automated adiabatic calorimeter.


Thermal degradation of CH3NH3PbI3 perovskite into NH3 and CH3I gases observed by coupled thermogravimetry–mass spectrometry analysis
Thermal gravimetric and differential thermal analysis (TG-DTA) coupled with quadrupole mass spectrometry (MS) and first principles calculations were employed to elucidate the chemical nature of
Degradation Mechanism and Relative Stability of Methylammonium Halide Based Perovskites Analyzed on the Basis of Acid-Base Theory.
An experimental back-reaction test demonstrates that the well-known CH3NH2/HX degradation route may not be the ultimate degradation pathway of MAPbX3 in thermodynamic closed systems and an unambiguous identification of CH3I release using microwave (rotational) spectroscopy is presented.
Large formamidinium lead trihalide perovskite solar cells using chemical vapor deposition with high reproducibility and tunable chlorine concentrations
Chemical vapor deposition is an inexpensive way to batch-process solar cells with good uniformity and facilitates low-cost production. Formamidinium lead iodide perovskite has a smaller energy band
Photodecomposition and thermal decomposition in methylammonium halide lead perovskites and inferred design principles to increase photovoltaic device stability
Hybrid lead halide perovskites have emerged as promising active materials for photovoltaic cells. Although superb efficiencies have been achieved, it is widely recognized that long-term stability is
Prospects for Mitigating Intrinsic Organic Decomposition in Methylammonium Lead Triiodide Perovskite.
The experimental evidence behind several possible routes for MAPI to degrade into PbI2 and various organics is discussed, and how the decomposition path of MAPI may strongly depend on substrate, precursors, intrinsic organic defects, and morphology.
Mechanism of Synthesis of Adenine from Hydrogen Cyanide under Possible Primitive Earth Conditions
IT has recently been shown that adenine and the purine precursors 4-aminoimidazole-5-carboxamidine and formamidine are formed spontaneously from hydrogen cyanide in water–ammonia systems under
Degradation of the Formamidinium Cation and the Quantification of the Formamidinium–Methylammonium Ratio in Lead Iodide Hybrid Perovskites by Nuclear Magnetic Resonance Spectroscopy
The highest efficiency in perovskite solar cells is currently achieved with mixed-cation hybrid perovskites. The ratio in which the cations are present in the perovskite structure has an important
Semiconducting tin and lead iodide perovskites with organic cations: phase transitions, high mobilities, and near-infrared photoluminescent properties.
It is found that the chemical and physical properties of these materials strongly depend on the preparation method, and the properties of the title hybrid materials with those of the "all-inorganic" CsSnI3 and CsPbI3 prepared using identical synthetic methods.
Intrinsic and Extrinsic Stability of Formamidinium Lead Bromide Perovskite Solar Cells Yielding High Photovoltage.
The operational stability of perovskites solar cells examined at a maximum power point revealed that the FAPbBr3 material is intrinsically as well as extrinsically stable, as the unsealed devices retained over 95% of the initial efficiency under continuous full sun illumination for 150 h in nitrogen and dry air and 80% in 60% relative humidity.
Entropy-driven structural transition and kinetic trapping in formamidinium lead iodide perovskite
In a photovoltaic perovskite, entropy-driven structural transition enables kinetic trapping of a desired photovoltaic phase. A challenge of hybrid perovskite solar cells is device instability, which