The effect of microstructure on the laser-induced transverse voltage in Pb-doped Bi2Sr2Co2Oy thin films on tilted substrates

Pb-doped Bi2Sr2Co2O (y) thin films were prepared on tilted LaAlO3(001) by using the chemical solution deposition technique under different annealing temperatures and its laser-induced transverse voltage effect was investigated by using a 308 nm pulsed radiation. The shape of the laser-induced voltages in these films depended strongly on the film microstructure. Films with a larger grain size and better crystalline quality had a voltage signal with greater amplitude and faster response time. The experimental results can be explained by a mechanism involving the transverse thermoelectric effect as well as the transport theory of thermoelectric materials.