Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells

[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry [CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry 7. Clean energy 01 natural sciences 0104 chemical sciences
DOI: 10.1126/science.abq7652 Publication Date: 2022-09-22T17:57:32Z
ABSTRACT
Realizing solution-processed heterostructures is a long-enduring challenge in halide perovskites because of solvent incompatibilities that disrupt the underlying layer. By leveraging dielectric constant and Gutmann donor number, we could grow phase-pure two-dimensional (2D) perovskite stacks desired composition, thickness, bandgap onto 3D without dissolving substrate. Characterization reveals 3D-2D transition region 20 nanometers mainly determined by roughness bottom Thickness dependence 2D layer anticipated trends for n-i-p p-i-n architectures, which consistent with band alignment carrier transport limits perovskites. We measured photovoltaic efficiency 24.5%, exceptional stability T99 (time required to preserve 99% initial efficiency) >2000 hours, implying 3D/2D bilayer inherits intrinsic durability compromising efficiency.
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