Load iodide material was purified using the zone refining technique. K_2Cr_2O_7 was doped 1% w/w as an impurity. The optical band gap of the pure crystal was measured which was observed ～2.71 eV and it reduces to 2.62 after doping of K_2Cr_2O_7. The conductivity of pure and doped material was also measured at different temperature. It was found that doping increases the conductivity.
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