Abstract
Large single crystals of black phosphorus have been grown under high pressure, and by using the crystals, the Hall measurements have been done in a range from 4.2 K to 550 K. All the undoped samples have exhibited p -type conduction, while we have succeeded in obtaining n -type crystals by doping Te impurity. The effective acceptor concentrations N A -N D of the p -type samples and those of donor in n -type samples N D -N A have been in the range of 2∼5×10 15 cm -3 and 2∼3×10 16 cm -3 , respectively. From the intrinsic range of the conductivity, the energy gap has been estimated to be 0.335 eV, The acceptor and donor activation energies have been determined to be ∼18 meV and ∼39 meV, respectively. The Hall mobility of the hole reaches its maximum of 6.5×10 4 cm 2 /V·sec around 20 K. The anisotropies of the conductivity and the mobility along the three crystal axes have been investigated.
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