2023-02-27 ノースカロライナ州立大学(NCState)
この発見により、より軽量で柔軟性があり、実用的に使用可能なより効率的なソーラーセル技術の新世代が開発される可能性があります。この研究の結果は、「Nature Materials」誌に掲載されました。
＜関連情報＞
マルチスケールイオン拡散フレームワークは、金属ハロゲン化物ペロブスカイトにおける拡散-安定性-ヒステリシスのネクサスに光を当てている。 A multiscale ion diffusion framework sheds light on the diffusion–stability–hysteresis nexus in metal halide perovskites
Masoud Ghasemi,Boyu Guo,Kasra Darabi,Tonghui Wang,Kai Wang,Chiung-Wei Huang,Benjamin M. Lefler,Laine Taussig,Mihirsinh Chauhan,Garrett Baucom,Taesoo Kim,Enrique D. Gomez,Joanna M. Atkin,Shashank Priya & Aram Amassian
Nature Materials Published:27 February 2023
DOI:https://doi.org/10.1038/s41563-023-01488-2
Abstract
Stability and current–voltage hysteresis stand as major obstacles to the commercialization of metal halide perovskites. Both phenomena have been associated with ion migration, with anecdotal evidence that stable devices yield low hysteresis. However, the underlying mechanisms of the complex stability–hysteresis link remain elusive. Here we present a multiscale diffusion framework that describes vacancy-mediated halide diffusion in polycrystalline metal halide perovskites, differentiating fast grain boundary diffusivity from volume diffusivity that is two to four orders of magnitude slower. Our results reveal an inverse relationship between the activation energies of grain boundary and volume diffusions, such that stable metal halide perovskites exhibiting smaller volume diffusivities are associated with larger grain boundary diffusivities and reduced hysteresis. The elucidation of multiscale halide diffusion in metal halide perovskites reveals complex inner couplings between ion migration in the volume of grains versus grain boundaries, which in turn can predict the stability and hysteresis of metal halide perovskites, providing a clearer path to addressing the outstanding challenges of the field.
