  We have studied the evolution of the thermoelectric power S(T) with oxygen
doping of single-layered Bi2Sr2CuO6+d thin films and ceramics in the overall
superconducting (Tc, S290K) phase diagram. While the universal relation between
the room-temperature thermopower S290K and the critical temperature is found to
hold in the strongly overdoped region (d>0.14), a strong violation is observed
in the underdoped part of the phase diagram. The observed behaviour is compared
with other cuprates and the different scenarios are discussed.
