We have measured the transient of surface photovoltage in metal halide perovskites Cs0.05(MA0.14,FA0.86)0.95Pb(I0.84,Br0.16)3
We excited with light with photon energy ( ~1.26 eV) below the perovskite bandgap (~1.63 eV) with a power of ~100mW/cm2. After the light is turned off, we see a relatively slow transient. My question is: ”Can photons with energy below the perovskite bandgap produce activation of ions and as a consequence - ion migration?”
Dear colleague,
In my opinion as son as a photon is absorbed on a compound it modify the bondind energy round it so leading eventualy to migration.
Yes, photons with energies below the perovskite bandgap can produce activation of ions, leading to ion migration. This is because the excitation of electrons from the ground state to an intermediate state is possible through the absorption of lower energy photons. This is followed by a relaxation process which results in the formation of excited electron-hole pairs and can lead to ionic migration.
Thank you Mr Sagayaraj.
Could you please cite a paper reporting such processes if you have some?
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