研究目的

Investigating the therapeutic effects of a specific herbal medicine on a particular disease.

研究成果

In summary, molecularly designed GN-GQDs are used as additive in MAPbI3 perovskite. GN-GQDs with lots of active N sites infulence the crystalline of the PVK and passivate the GB trap states by Lewis acid-base interaction. GN-GQDs is n-type doped semiconductor which also n-doped the perovskite to slightly upshift the Fermi energy level of the hybrid GN-GQDs+PVK. Moreover, the GN-GQDs exhibit opened bandgap with CBM and VBM matched well with the energy structure of MAPbI3. Therefore, the charge transport of the GN-GQDs+PVK film is greatly accelarated and the charge recombination is largely reduced. The inverted perovskite solar cells based on GN-GQDs+PVK active layer show much higher efficiency of 19.8% than 17.1% of the control device. Based on the reduced GB trap states and more hydrophobic property of GN-GQDs+PVK film, the solar cell device also exhibits better enviroment stability of 30 days without encapsulation. This work suggests a molecular design method of GQDs to realize a functional semiconductor additive used in efficient and stable perovskite solar cells.

研究不足

The technical and application constraints of the experiments, as well as potential areas for optimization.