In Situ Growth of PbS/PbI(2) Heterojunction and Its Photoelectric Properties

In this paper, PbI(2) thin films with a uniform surface morphology and compact structure were prepared by adjusting the spin coating process parameters. On such a basis, the PbS/PbI(2) heterojunction was fabricated on the PbI(2) surface by the method of in situ chemical replacement growth. The results show that the PbS/PbI(2) heterojunction grown by this method has a clear interface and is closely combined. The introduction of a PbS layer enables its spectral response range to cover the visible and near-infrared regions. Compared with the PbI(2) thin film device, its responsivity is increased by three orders of magnitude, its response time reduced by 42%, and its recovery time decreased by nearly 1/2 under 450 nm illumination. In the case that there is no response for the PbI(2) thin film device under 980 nm illumination, the specific detectivity of the PbS/PbI(2) heterojunction device still amounts to 1.8 × 10(8) Jones. This indicates that the in situ chemical replacement is a technique that can construct a high-quality heterojunction in a simple process. PbS/PbI(2) heterojunction fabricated by this method has a visible–near-infrared light detection response range, which provides a new idea for creating visible–near-infrared common-path detection systems.