Sounds exciting. Well .....
I learnt from Eran Rabani yesterday that it turns out that these claims of large quantum yields are based on a mis-interpretation of experimental data. Skimming the literature I found this recent paper which notes:
uncontrolled photocharging of the nanocrystal core can lead to exaggeration of the Auger decay component and, as a result, significant deviations of the apparent [carrier multiplication] CM efficiencies from their true values. Specifically, we observe that for the same sample, apparent multiexciton yields can differ by a factor of 3 depending on whether the nanocrystal solution is static or stirred.
I guess it goes back to "extra-ordinary claims require extra-ordinary evidence". It cannot be emphasized enough the importance of checking results and on considering alternative explanations for data, rather than uncritically embracing the interpretation we (or others) hope to be true.
Thanks for the tip of that new article, very interesting.
ReplyDeleteLike the blog also,
keep it up!