At room temperature, where the thermal activation results in the greatly reduced τ 1 , τ 1 shows an increasing trend with increased doping level before dropping at the highest doping level of 10 wt % ( Figure d inset).
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At room temperature, where the thermal activation results in the greatly reduced τ 1 , τ 1 shows an increasing trend with increased doping level before dropping at the highest doping level of 10 wt % ( Figure d inset).