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Integrated Bulk-Surface Engineering Stabilizes MA-Free Wide-Bandgap Perovskites for Tandem Photovoltaics
Yu Tong1,2, Biao Li2, Youming Zhu2
1Institute of Functional Nano & Soft Materials, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 5, 2026
Summary
This study introduces a novel strategy to create stable, high-efficiency, methylammonium-free wide-bandgap perovskites for tandem solar cells. The new approach overcomes key stability and performance issues, enabling advanced photovoltaic applications.
Area of Science:
- Materials Science
- Photovoltaics
- Solid-State Chemistry
Background:
- Wide-bandgap perovskites are crucial for perovskite/silicon tandem solar cells.
- Conventional perovskites (FA1-x-yCsxMAyPbI1-zBrz) contain volatile methylammonium (MA) and mixed halides, limiting stability and performance.
- MA-free perovskites (FA1-xCsxPbI1-zBrz) face challenges like accelerated crystallization, increased defect density, and voltage losses due to MA absence and high bromine content.
Purpose of the Study:
- To develop a stable, high-efficiency, methylammonium-free wide-bandgap perovskite for tandem solar cells.
- To overcome the intrinsic bottlenecks of MA-free perovskites, including defect formation and halide instability.
- To enhance the operational stability and performance of perovskite solar cells and perovskite/silicon tandem devices.
Main Methods:
- A coupled bulk-surface regulation strategy was employed using homopiperidinic acid hydroiodide and trimethylenediamine dihydroiodide salts.
- Homopiperidinic acid hydroiodide incorporation healed bulk lattice defects and suppressed halide migration.
- Trimethylenediamine dihydroiodide treatment neutralized surface defects like unsaturated Pb2+ and halide vacancies.
Main Results:
- The coupled strategy effectively suppressed defect formation and minimized non-radiative recombination.
- Wide-bandgap perovskite solar cells achieved a 23.71% efficiency with operational stability (T92 > 1000 h).
- Perovskite/silicon tandem solar cells reached a 32.26% efficiency with long-term durability.
Conclusions:
- Molecular coupling consolidation offers a new paradigm for creating stable, high-efficiency, MA-free wide-bandgap perovskites.
- This advancement is critical for the practical realization of reliable and efficient tandem photovoltaics.
- The developed strategy successfully addresses the stability and performance limitations of previous MA-free perovskite formulations.
