A 2D/3D Heterostructure Perovskite Solar Cell with a Phase‐Pure and Pristine 2D Layer
Abstract
AbstractInterface engineering plays a critical role in advancing the performance of perovskite solar cells. As such, 2D/3D perovskite heterostructures are of particular interest due to their optoelectrical properties and their further potential improvements. However, for conventional solution‐processed 2D perovskites grown on an underlying 3D perovskite, the reaction stoichiometry is normally unbalanced with excess precursors. Moreover, the formed 2D perovskite is impure, leading to unfavorable energy band alignment at the interface. Here a simple method is presented that solves both issues simultaneously. The 2D formation reaction is taken first to completion, fully consuming excess PbI2. Then, isopropanol is utilized to remove excess organic ligands, control the 2D perovskite thickness, and obtain a phase‐pure, n = 2, 2D perovskite. The outcome is a pristine (without residual 2D precursors) and phase‐pure 2D perovskite heterostructure with improved surface passivation and charge carrier extraction compared to the conventional solution process. PSCs incorporating this treatment demonstrate a notable improvement in both stability and power conversion efficiency, with negligible hysteresis, compared to the conventional process.
Article Details
Authors (18)
Meng‐Chen Shih
Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA
Shaun Tan
Department of Chemistry
Yongli Lu
Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA
Tim Kodalle
Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, United States
Do‐Kyoung Lee
Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
Yifan Dong
Frontier Institute of Science and Technology
Bryon W. Larson
Chemistry and Nanoscience Center National Renewable Energy Laboratory (NREL) 15013 Denver West Parkway Golden CO 80401 USA
Soyeon Park
Ruiqi Zhang
Matthias J. Grotevent
Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
Tara Sverko
Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA
Hua Zhu
Yu‐Kuan Lin
Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA
Carolin M. Sutter‐Fella
Molecular Foundry Division Lawrence Berkeley National Laboratory 67 Cyclotron Road Berkeley CA 94720 USA
Kai Zhu
Matthew C. Beard
National Renewable Energy Laboratory
Vladimir Bulović
Moungi G. Bawendi
Department of Chemistry