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Formamidinium Iodide (FAI)

CAS Number 879643-71-7

Perovskite Materials, Perovskite Precursor Materials


Product Code M551-5g
Price $250 ex. VAT

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Formamidinium iodide, precursor for optimum solar conversion efficiencies

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Formamidinium lead iodide shows a narrower bandgap than the commonly used methylammonium lead iodide (1.48 eV compared to ~1.57 eV), and hence lies closer to that favourable for optimum solar conversion efficiencies. With an approach of FAPbI3 crystallisation by the direct intramolecular exchange of dimethylsulfoxide (DMSO) molecules intercalated in PbI2 with formamidinium iodide, device with performance over 20% has been fabricated.

Formamidinium Iodide (FAI) from Ossila was used in a high-impact paper (IF 9.229)

Formamidinium Iodide (FAI) from Ossila was used in the high-impact paper (IF 9.229), Using Soft Polymer Template Engineering of Mesoporous TiO2 Scaffolds to Increase Perovskite Grain Size and Solar Cell Efficiency, Q. Lian et al., ACS Appl. Mater. Interfaces 12, 18578–18589 (2020); DOI: 10.1021/acsami.0c02248.

General Information

CAS number 879643-71-7
Chemical formula CH5IN2
Molecular weight 171.97 g/mol
Synonyms FAI, Formamidine hydroiodide
Classification / Family Perovskite precursor materials, Perovskite solar cells, OLEDs

Product Details

Purity

M552: 98%

M551: >99.5% (further purified by double recrystalisation from 98% grade in ethanol)

Melting point 242 °C
Colour White powder/crystals

Chemical Structure

formamidinium iodide, fai
Chemical structure of formamidinium iodide (FAI); CAS No. 879643-71-7; chemical fomula CH5IN2.

Applications

Formamidinium lead iodide shows a narrower bandgap than the commonly used methylammonium lead iodide (1.48 eV compared to ~1.57 eV), and hence lies closer to that favourable for optimum solar conversion efficiencies [1]. Spin-coating the formamidinium iodide (FAI) plus PbI2 precursor solution in N,N-dimethylformamide (DMF) initially resulted in discontinuous perovskite films. However, by adding a small amount of hydroiodic acid (HI) to the stoichiometric FAI, extremely uniform and continuous films were formed.

Controlled humidity is another deciding factor that affects the film morphology, crystallinity, and optical and electrical properties of FAPbI3 [2]. 16.6% PCE was achieved with low relative humidity of 2%, with the device efficiency dropped to about half (8.6%) when the humidity was 40%.

Low-volatility additives such as FACl and MACl are good candidates for assisting in the crystallisation of phase pure α-FAPbI3 via the formation of intermediate mixtures, which prohibits the crystallisation of the δ-FAPbI3 phase [3]. It also has been observed that the black perovskite-type polymorph (α-phase), which is stable at relatively high temperatures (above 160 oC), turned into the yellow FAPbI3 polymorph (δ-phase) in an ambient humid atmosphere. Results show that incorporation of MAPbBr3 into FAPbI3 stabilises the perovskite phase of FAPbI3 and improves the power conversion efficiency of the solar cell to more than 18% under a standard illumination of 100 mW/cm2 [4].

With an approach of FAPbI3 crystallisation by the direct intramolecular exchange of dimethylsulfoxide (DMSO) molecules intercalated in PbI2 with formamidinium iodide, device with performance over 20% has been fabricated [5].

Device structure FTO/TiO2/FAPbIBr2/spiro-OMeTAD/Au [1]
JSC (mA cm-2) 23.3
VOC (V) 0.94
FF (%) 65
PCE (%) 14.2
Device structure FTO/TiO2/(FAPbI3)0.85(MAPbBr3)0.15/PTAA/Au [4]
JSC (mA cm-2) 22.5
VOC (V) 1.11
FF (%) 73.2
PCE (%) 18.4
Device structure FTO/bl-TiO2/mp-TiO2/FAPbI3 (DMSO)/PTAA/Au [5]
JSC (mA cm-2) 24.7
VOC (V) 1.06
FF (%) 77.5
PCE (%) 20.2

MSDS Documentation

Formamidinium Iodide MSDSFormamidinium iodide MSDS sheet

Pricing

 Grade Order Code Quantity Price
98% purity M552 5 g £130
98% purity M552 10 g £220
98% purity M552 25 g £300
>99.5% purity M551 5 g £200
>99.5% purity M551 10 g £330

Literature and reviews

  1. Formamidinium lead trihalide: a broadly tunable perovskite for efficient planar heterojunction solar cells, G. E. Eperon et al., Energy Environ. Sci., 7, 982-988 (2014),  DOI: 10.1039/C3EE43822H. 
  2. Controlled Humidity Study on the Formation of Higher Efficiency Formamidinium Lead Triiodide-Based Solar Cells, S. Wozny et al., Chem. Mater., 27 (13), 4814–4820 (2015), DOI: 10.1021/acs.chemmater.5b01691.
  3. Additive-Modulated Evolution of HC(NH2)2PbI3 Black Polymorph for Mesoscopic Perovskite Solar Cells, Z. Wang et al., Chem. Mater., 27 (20), 7149–7155 (2015), DOI: 10.1021/acs.chemmater.5b03169.
  4. Compositional engineering of perovskite materials for high-performance solar cells, N. Jeon et al., Nature 517, 476–480 (2015), doi:10.1038/nature14133.
  5. High-performance photovoltaic perovskite layers fabricated through intramolecular exchange,
    W-S. Yang et al., Science, 348 (6240), 1234-1237 (2015). DOI: 10.1126/science.aaa9272.
  6. Temperature dependence of hole conductor free formamidinium lead iodide perovskite based solar cells, S. Aharon et al., J. Mater. Chem. A., 3, 9171-9178 (2015), DOI: 10.1039/C4TA05149A.
  7. High-Efficiency Perovskite Solar Cells Based on the Black Polymorph of HC(NH2)2PbI3, J-W. Lee et al., Adv. Mater., 26: 4991–4998 (2014). doi:10.1002/adma.201401137.
  8. Efficient hole-conductor-free, fully printable mesoscopic perovskite solar cells with a broad light harvester NH2CH=NH2PbI3, M. Hu et al., J. Mater. Chem. A, 2, 17115-17121 (2014), DOI: 10.1039/C4TA03741C.

To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.

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