Abstract

In this work,the steady-state photoluminescence(PL) and time-resolved photoluminescence(TRPL) of polycrystalline CdTe on different substrates were measured at room temperature by a Nd∶YAG picosecond laser as the excitation source.With the increasing of pump power,the PL spectra have been broadened towards high photon energy.The PL spectra of the annealed sample exhibit another small band,which is attributed to the donor-acceptor pair recombination by a chlorine donor and a cadmium vacancy complex acceptor.The PL decay curve presents bi-exponential processes.The processes with long and short lifetimes are related to surface trapping state and band-edge excitonic state,respectively.Annealing treatment makes the fluorescence lifetime longer and benefits for the separation of the electron-hole pair before being composited.

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