introduction
Due to the existence of unavoidable thermal/wet instability in the conventional organic-inorganic hybrid perovskite materials, the performance degradation of the device under high temperature or high humidity conditions is severe, impeding the commercialization of perovskite solar cells. Under this background, the pure inorganic lead-halide halide perovskite has good environmental stability and excellent photovoltaic performance. It naturally becomes a research hot spot for commercial perovskite solar cells. Common inorganic lead-halide halide perovskites It is lead bismuth iodide, but there are two phases of strontium lead lead perovskite, one is low temperature phase (orthorhombic phase) and high temperature α phase (cubic phase). The bandgap of these two phases is 2.82 respectively. With eV and 1.7 eV, only the high-temperature cubic phase of bismuth lead iodide is the ideal light-absorbing material for high-efficiency perovskite solar cells. Therefore, it is still a matter of how to make the cesium-lead perovskite stable in the cubic phase at room temperature. The great challenge is also the key to the preparation of stable and efficient cesium lead-lead perovskite solar cells.
Achievements
Recently, professor Yin Longwei from Shandong University and others published an article entitled 'Surface passivation engineering strategy to fully-inorganic cubic CsPbI3 perovskites for high-performance solar cells' on Nature. Commun. (PVP) induces the surface passivation process to obtain a long-term and stable cubic phase of bismuth lead iodide with a cell efficiency as high as 10.74% and excellent environmental stability.
summary
Researchers have obtained a highly efficient and stable cubic-phase lead iodide lead perovskite thin film solar cell through a polymer PVP passivation method. The device efficiency is as high as 10.74%, and has a good stability. The result is to promote pure inorganic calcium. The commercialization of titanium ore is of great significance.
