Electrical characteristics of lead iodide crystal devices on flexible substrate under mechanical tensile strain

摘要

We report the experimental study on the electrical characteristics of a flexible device based on PbI_2 crystal. It is found that the ohmic contact characteristics remain the same, but the dark current decreased with increasing mechanical tensile strain. The value of the bandgap E_g = 2.28 eV obtained from optical absorption spectra is kept in a steady state during bending, but a widening of the band-tail state occurs.