TY - JOUR
T1 - On the influence of multiple cations on the in-gap states and phototransport properties of iodide-based halide perovskites
AU - Azulay, Doron
AU - Levine, Igal
AU - Gupta, Satyajit
AU - Barak-Kulbak, Einav
AU - Bera, Achintya
AU - San, Granit
AU - Simha, Shir
AU - Cahen, David
AU - Millo, Oded
AU - Hodes, Gary
AU - Balberg, Isaac
N1 - Publisher Copyright:
© the Owner Societies.
PY - 2018
Y1 - 2018
N2 - In-gap states in solar cell absorbers that are recombination centers determine the cell's photovoltaic performance. Using scanning tunneling spectroscopy (STS), temperature-dependent photoconductivity and steady-state photocarrier-grating measurements we probed, directly and indirectly, the energies of such states, both at the surface and in the bulk of two similar, but different halide perovskites, the single cation MAPbI3 (here MAPI) and the mixed cation halide perovskite, FA0.79MA0.16Cs0.05Pb(I0.83Br0.17)3 (here MCHP). We found a correlation between the energy distribution of the in-gap states, as determined by STS measurements, and their manifestation in the photo-transport parameters of the MCHP absorbers. In particular, our results suggest that the in-gap recombination centers in the MCHP are shallower than those of MAPI. This can be one explanation for the better photovoltaic efficiency of the former.
AB - In-gap states in solar cell absorbers that are recombination centers determine the cell's photovoltaic performance. Using scanning tunneling spectroscopy (STS), temperature-dependent photoconductivity and steady-state photocarrier-grating measurements we probed, directly and indirectly, the energies of such states, both at the surface and in the bulk of two similar, but different halide perovskites, the single cation MAPbI3 (here MAPI) and the mixed cation halide perovskite, FA0.79MA0.16Cs0.05Pb(I0.83Br0.17)3 (here MCHP). We found a correlation between the energy distribution of the in-gap states, as determined by STS measurements, and their manifestation in the photo-transport parameters of the MCHP absorbers. In particular, our results suggest that the in-gap recombination centers in the MCHP are shallower than those of MAPI. This can be one explanation for the better photovoltaic efficiency of the former.
UR - http://www.scopus.com/inward/record.url?scp=85054051426&partnerID=8YFLogxK
U2 - 10.1039/c8cp03555e
DO - 10.1039/c8cp03555e
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C2 - 30221290
AN - SCOPUS:85054051426
SN - 1463-9076
VL - 20
SP - 24444
EP - 24452
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 37
ER -
