2D WSe₂ Flakes for Synergistic Modulation of Grain Growth and Charge Transfer in Tin-Based Perovskite Solar Cells.

ABSTRACT: Tin (Sn)-based perovskites with favorable optoelectronic properties and ideal bandgaps have emerged as promising alternatives to toxic lead (Pb)-based perovskites for photovoltaic applications. However, it is challenging to obtain high-quality Sn-based perovskite films by solution process. Here, liquid-exfoliated 2D transition-metal dichalcogenides (i.e., MoS₂ , WS₂ , and WSe₂ ) with smooth and defect-free surfaces are applied as growth templates for spin-coated FASnI₃ perovskite films, leading to van der Waals epitaxial growth of perovskite grains with a growth orientation along (100). The authors find that WSe₂ has better energy alignment with FASnI₃ than MoS₂ and WS₂ and results in a cascade band str

SUBMITTER: Wang T 

PROVIDER: S-EPMC8188186 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature