# How does temperature affect excitonic absorption?

1. Jul 10, 2013

### hokhani

As far as I know, free electron-hole or excitons can be created by absorbing a photon of relevant energy. So dissociation of excitons shouldn't make any effects on absorption because dissociation happens after the absorption. Nevertheless I saw in some texts that in the limit of the temperatures $K_B T>>(exciton's binding energy)$, that excitons would dissociate, exciton absorption lines are not observed.