  The potential of bulk black-phosphorus for thermoelectric applications has
been experimentally studied. The Seebeck Coefficient (S) has been measured in
the temperature range from 300 K to 385 K, finding a value of S = +335 +- 10
uV/K at room temperature (indicating a naturally occurring p-type
conductivity). S increases with temperature, as expected for p-type
semiconductors, which can be attributed to an increase of the charge carrier
density. The electrical resistance drops up to a 40 % while heating in the
studied temperature range. As a consequence, the power factor at 385 K is 2.7
times higher than that at room temperature. This work demonstrates the
feasibility of black-phosphorus in thermoelectric applications, such as thermal
energy scavenging, which typically require devices with high performance at
temperatures above room temperature.
