Effects of Voltage and Temperature on Photoelectric Properties of Rolled-Up Quantum Well Nanomembranes

Rolled-up quantum well (QW) nanomembranes with different diameters are prepared using the lift-off method. The structural evolution and the influences of voltage and temperature on the photoelectric properties of the nanomembranes are investigated. We find that a QW in tensile status can enhance the photorepsonse by about 2.1 times, and a QW in compressive status leads to a decrease of photorepsonse to ~ 65%. With increasing temperature, the gap between the ground state and excited state in the conduction band decreases with a rate of ~ 0.008 meV/K and the thermal effect mainly affects the shift of conduction band. For a working rolled-up device, the change of band gap due to the thermal effect from the applied voltage is negligible.