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Guanidinium Iodide

CAS Number 19227-70-4

Perovskite Materials, Perovskite Precursor Materials


Product Code M2072A1-25g
Price $225 ex. VAT

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High quality, high purity guanidinium iodide

Used to enhance carrier lifetimes and open circuit voltages in perovskite solar cells


It has been demonstrated that guanidinium iodide (GI) based additives show significant enhancement in carrier lifetimes and open-circuit voltages in hybrid organic-inorganic perovskite solar cells, due to the hydrogen bonding capability of the GI molecule [1].

Speculation is that hydrogen bonding allows for effective passivation of under-coordinated iodine species located at grain boundaries - both at the surface and internally within the bulk. 

Superior performance with cell power conversion efficiencies greater than 17% and an open-circuit voltage of 1.1 V were achieved with device structure ITO/TiO2/perovskite/Spiro-OMeTAD/Au.

General Information

CAS number 19227-70-4
Chemical formula CH6IN3
Molecular weight 186.98 g/mol
Synonyms Guanidine hydroiodide, Diaminomethaniminium iodide, Guanidine monohydroiodide, GI
Classification / Family Guanidinium halides, Perovskite precursor materials, Perovskite solar cells, Perovskite LEDs

Product Details

Purity 98%
Melting point 194-199 °C
Colour White Powder/crystals

Chemical Structure

Guanidinium iodide, Diaminomethaniminium iodide, Guanidine hydroiodide, 19227-70-4
Chemical structure of Guanidinium iodide; CAS No. 19227-70-4

MSDS Documentation

Guanidinium iodide MSDSGuanidinium iodide MSDS sheet

Literature and reviews

  1. Guanidinium: A Route to Enhanced Carrier Lifetime and Open-Circuit Voltage in Hybrid Perovskite Solar Cells, N. De Marco et al., Nano Lett., 16 (2), 1009–1016 (2016); DOI: 10.1021/acs.nanolett.5b04060.
  2. Guanidinium benefit, O. Graydon, Nat. Photonics 10, 145 (2016); doi:10.1038/nphoton.2016.35.
  3. Synthesis, Crystal Structures, Optical Properties, and Phase Transitions of the Layered Guanidinium-Based Hybrid Perovskites [C(NH2)3]2MI4; M = Sn, Pb, M. Daub et al., Eur. J. Inorg. Chem., 1120–1126 (2017); DOI: 10.1002/ejic.201601499.

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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