This article contains errors in the units used for carrier mobility. In Fig. 2a–d, the units on the y axis should be ‘cm2V−1s−1' not ‘V−1s−1cm−1'. Similarly, the second and third sentences of the second paragraph of the ‘Quantum yield calculation' section should read ‘From Fig. 2 and Table 1, we obtain ϕμ(1+c1)=11 cm2V−1s−1 and ϕk2=11 × 10−10 cm3s−1. These data compare well with the corresponding values of 8.2 cm2V−1s−1 and 9.2 × 10−10 cm3s−1 in Wehrenfennig et al.8 where the support was mesoporous alumina.'