The thermoelectric figure of merit of a semiconductor p-n junction is calcu
lated in terms of the diode theory taking account of the bipolar thermal co
nductivity. The thermoelectric figure of merit of a Bi2Te3 diode is estimat
ed and it is shown that the Ioffe criterion may be at the same level as the
best modern thermoelectric materials but cannot exceed unity. (C) 2001 MAI
K "Nauka/Interperiodica".