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Reagents for Organic-Inorganic Perovskite, (MeNH3)PbX3

M2556, M2589
Perovskite solar cells, the so-called organic-inorganic hybrid solar cell, which were first reported in 2009 by Miyasaka et al. recently received much attention.1) The organic-inorganic perovskite crystal, (MeNH3)PbI3, can functionalize as a visible light sensitizer toward titanium dioxide. In the solar cell device with a hole transport material (eg. Spiro-OMeTAD), the energy conversion efficiency has been more than 15% so far, thus it is greater than those of organic photovoltaics (OPV) and dye-sensitized solar cells (DSSC).2,3) The perovskite solar cell is able to output more than 1 V, because the perovskite compound shows strong absorptivity of light and then efficiently transports both electron and hole carriers without their recombination. A device of the perovskite solar cell can be fabricated by a solution process for manufacturing at low cost.
A modification of X in the (MeNH3)PbX3 can control the band gap and range of absorption wavelength. The perovskite compound with X = Br is useful for photo absorption in shorter wavelengths (<560 nm) and the compound with X = I is relatively useful for that in longer wavelengths up to 800 nm.1) Methylamine hydroiodide (1) or methylamine hydrobromide (2) is reacted with lead(II) halide to give the corresponding organic-inorganic perovskite compound, (MeNH3)PbX3 (X = Br or I).
A modification of X in the (MeNH3)PbX3 can control the band gap and range of absorption wavelength.

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