Radiation response analysis of wide-gap p-AlInGaP for superhigh-efficiency space photovoltaics

Khan, Aurangzeb; Marupaduga, S.; Anandakrishnan, S. S.; Alam, M.; Ekins-Daukes, N. J.; Lee, H. S.; Sasaki, T.; Yamaguchi, M.; Takamoto, T.; Agui, T.; Kamimura, K.; Kaneiwa, M.; Imazumi, M.
November 2004
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5218
Academic Journal
We present here the direct observation of the majority and minority carrier defects generation from wide-band-gap (2.04 eV) and thick (2 μm) p-AlInGaP diodes and solar cells structures before and after 1 MeV electron irradiation by deep level transient spectroscopy (DLTS). One dominant hole-emitting trap H1 (EV+0.37±0.05 eV) and two electron-emitting traps, E1 (EC-0.22±0.04 eV) and E3 (EC-0.78±0.05 eV) have been observed in the temperature range, which we could scan by DLTS. Detailed analysis of the minority carrier injection annealing experiment reveals that the H1 center has shown the same annealing characteristics, which has been previously observed in all phosphide-based materials such as InP, InGaP, and InGaAsP. The annealing property of the radiation-induced defects in p-AlInGaP reveals that multijunction solar cells and other optoelectronic devices such as light-emitting diodes based on this material could be considerably better to Si and GaAs in a radiation environment.


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