Table 1. Activation energies for polaron hopping, extracted from experimental data by KMC simulations.

The first four columns show activation energies for electron polaron hopping in nominally undoped and Ti-doped materials. The last column shows results for hole hopping in a Ni-doped sample.

	Undoped	0.03% Ti	0.7% Ti	3% Ti	0.1% Ni (holes)
d = 0.3 nm, v0 = 1013 s−1	75 meV	54 meV	31 meV	22 meV	230 meV
d = 0.3 nm, v0 = 105 s−1 (unphysical)	43 meV	30 meV	15 meV	11 meV
d = 2.5 nm, v0 = 1013 s−1	79 meV	58 meV	33 meV	23 meV
d = 25 nm, v0 = 1013 s−1	90 meV	67 meV	38 meV	27 meV