Guanidinium iodide

Order Code: M2072A1


(excluding Taxes)


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
Guanidinium iodide, Diaminomethaniminium iodide, Guanidine hydroiodide, 19227-70-4
Chemical structure of Guanidinium iodide; CAS No. 19227-70-4; chemical fomula CH6IN3.



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.


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.

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