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

• DOI: 10.1126/science.abq7652
• Publication Date: 2022-09-22T17:57:32Z
• Authors: Siraj Sidhik; Yafei Wang; Michael De Siena; Reza Asadpour; Andrew J. Torma; Tanguy Terlier; Kevin Ho; Wenbin Li; Anand B. Puthirath; Xinting Shuai; Ayush Agrawal; Boubacar Traore; Matthew Jones; Rajiv Giridharagopal; Pulickel M. Ajayan; Joseph Strzalka; David S. Ginger; Claudine Katan; Muhammad Ashraful...; Jacky Even; Mercouri G. Kanat...; Aditya D. Mohite
• Keywords: [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

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.