Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells
Abstract
Realizing solution-processed heterostructures is a long-enduring challenge in halide perovskites because of solvent incompatibilities that disrupt the underlying layer. By leveraging the solvent dielectric constant and Gutmann donor number, we could grow phase-pure two-dimensional (2D) halide perovskite stacks of the desired composition, thickness, and bandgap onto 3D perovskites without dissolving the underlying substrate. Characterization reveals a 3D–2D transition region of 20 nanometers mainly determined by the roughness of the bottom 3D layer. Thickness dependence of the 2D perovskite layer reveals the anticipated trends for n-i-p and p-i-n architectures, which is consistent with band alignment and carrier transport limits for 2D perovskites. We measured a photovoltaic efficiency of 24.5%, with exceptional stability of T 99 (time required to preserve 99% of initial photovoltaic efficiency) of >2000 hours, implying that the 3D/2D bilayer inherits the intrinsic durability of 2D perovskite without compromising efficiency.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 23, 2022
- Source ID
- 10.1126/science.abq7652
Entities
People
- Aditya D Mohite
- Anand B Puthirath
- Andrew Torma
- Ayush Agrawal
- Boubacar Traore
- Claudine Katan
- David Ginger
- Jacky Even
- Joseph W Strzalka
- Kevin Ho
- Matthew R. Jones
- Mercouri Kanatzidis
- Michael C. De Siena
- Muhammad Ashraful Alam
- Pulickel Ajayan
- Rajiv Giridharagopal
- Reza Asadpour
- Siraj Sidhik
- Tanguy Terlier
- Wenbin Li
- Xinting Shuai
- Yafei Wang
Organizations
- Argonne National Laboratory
- Guangzhou University
- Northwestern University
- Purdue University
- Rice University
- University of Washington
- École nationale supérieure de chimie de Rennes