CH₃NH₃PbI₃ Perovskite/Silver Nanowire Complex with Higher Absorption and Stability

Recently, CH₃NH₃PbI₃ perovskite has drawn much attention in photoelectric fields due to its unique properties, and it is mostly applied to solar cell devices, laser technology, and other research fields. For improving these applications, the absorption and stability of CH₃NH₃PbI₃ perovskite are both critical. In this work, we proposed a perovskite absorber consisting of CH₃NH₃PbI₃ and silver nanowires (AgNWs) for broadening its photoelectric applications. Using AgNWs, the combined perovskite material had a 5.3-fold enhancement in the absorption coefficient relative to that of CH₃NH₃PbI₃ perovskite, which is comparable to the enhancement observed for CH₃NH₃PbI₃ perovskite with ZnO nanorod arrays. In addition to absorption enhancement, the perovskite absorber also showed good long-term stability. Optical absorption measurements revealed that the electromagnetic field induced by the AgNWs increased the diffusion velocity of excitons and decreased exciton recombination, and the enhanced effect varied with the AgNWs content. Compared to other CH₃NH₃PbI₃ absorber materials, the CH₃NH₃PbI₃-AgNWs complex showed a higher performance due to the higher density of electrons around perovskite. Our work paved the road to the designing of the CH₃NH₃PbI₃-based complex, for improving the performance of CH₃NH₃PbI₃ perovskite and further its applications in optoelectronics.