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Optoelectronic characterization of polycrystalline solar cells using time-resolved biased luminescence techniques

This study aims to provide an innovative insight on polycrystalline solar cells characterization. Accurate and complete information on the material's performance is achieved by probing micrometric fluctuations of its charge carriers' transport properties which might influence the global device’s performance[1][2]. Results on microcrystalline Cu(In,Ga)Se2 solar cells absorbers[3] exhibited an initial fast decay followed by a slower one . Short decay lifetimes varying between 0.4 ns and 1.8 ns, were found to be linked to recombination centers, whereas longer decay lifetimes fluctuating between 3ns and 8ns, were associated with the presence of shallow emission traps. By varying the excitation wavelength from 850nm to 450nm excitation, the authors observed a hysteresis phenomenon regarding the behavior of TRPL decays as a function of the value order of the excitation wavelength. This is related to the activation of metastable defects located at the absorber/buffer interface.