A 2D/3D Heterostructure Perovskite Solar Cell with a Phase‐Pure and Pristine 2D Layer
Interface 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 PbI<sub>2</sub>. 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.
Authors
- Yongli Lu (ORCID: https://orcid.org/0000-0002-7113-4124)
- Tara Šverko (ORCID: https://orcid.org/0000-0002-2046-9151)
- Shaun Wee Kiat Tan (ORCID: https://orcid.org/0000-0002-0444-6777)
- Bryon W. Larson (ORCID: https://orcid.org/0000-0002-0934-987X)
- Tim Kodalle (ORCID: https://orcid.org/0000-0002-8792-9669)
- Yifan Dong (ORCID: https://orcid.org/0000-0003-2912-3322)
- Matthias J. Grotevent (ORCID: https://orcid.org/0000-0003-0821-2959)
- Vladimir Bulović (ORCID: https://orcid.org/0000-0002-0960-2580)
- Kai Zhu (ORCID: https://orcid.org/0000-0003-0908-3909)
- Do Kyung Lee (ORCID: https://orcid.org/0000-0001-6596-1222)
- Matthew C. Beard (ORCID: https://orcid.org/0000-0002-2711-1355)
- Carolin M. Sutter‐Fella (ORCID: https://orcid.org/0000-0002-7769-0869)
- Hua Zhu (ORCID: https://orcid.org/0000-0003-2733-7837)
- So Yeon Park (ORCID: https://orcid.org/0000-0002-0299-7268)
- Ruiqi Zhang (ORCID: https://orcid.org/0000-0003-3901-8737)
- M. C. Shih
- Yu‐Kuan Lin (ORCID: https://orcid.org/0009-0002-3891-6084)
- Moungi G. Bawendi (ORCID: https://orcid.org/0000-0003-2220-4365)
Institutions
- National Laboratory of the Rockies (US)
- University of Nevada, Las Vegas (US)
- Lawrence Berkeley National Laboratory (US)
- Massachusetts Institute of Technology (US)
Publication Details
- Journal
- Advanced Materials
- Published
- 2025-03-18
- DOI
- https://doi.org/10.1002/adma.202416672
- Citations
- 15
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 10.96
Funders
- U.S. Department of Energy
- Center for Hybrid Organic Inorganic Semiconductors for Energy
- Basic Energy Sciences
- Solar Energy Technologies Office