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High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented
Li-Chun Chang1, The Duong1, Viqar Ahmad1
1School of Engineering, The Australian National University, Canberra, Australian Capital Territory, 2601, Australia.
Nano-Micro Letters
|January 13, 2026
Summary
Researchers developed a novel blended self-assembled monolayer for inverted perovskite solar cells, enhancing interface uniformity and energy alignment. This breakthrough boosts solar cell efficiency and performance in tandem applications.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Interface engineering is crucial for advancing inverted perovskite solar cells (iPSCs).
- Self-assembled monolayers (SAMs) on transparent conductive oxides are effective hole transport layers but face challenges like energy mismatches and surface inhomogeneities.
- Optimizing the interface between charge transport layers and perovskite is key to improving solar cell performance.
Purpose of the Study:
- To develop an improved interface engineering strategy for iPSCs using a blended SAM approach.
- To enhance surface potential uniformity and interfacial energy alignment compared to individual SAMs.
- To investigate the interactions between SAMs and ionic species and eliminate interfacial energy barriers.
Main Methods:
- Fabrication of a blended self-assembled monolayer using (2-(9H-carbazol-9-yl)ethyl)phosphonic acid (2PACz) and (4-(3,6-Dimethyl-9H-carbazol-9-yl)butyl)phosphonic acid (Me-4PACz).
- Investigation of SAM-perovskite interactions and interfacial properties using simulation analysis.
- Fabrication and characterization of wide-bandgap inverted perovskite solar cells and perovskite/silicon tandem solar cells.
Main Results:
- The blended SAM demonstrated improved surface potential uniformity and interfacial energy alignment.
- Simulation analysis revealed the elimination of interfacial energy barriers through precise energy-level tuning.
- Achieved over 24% efficiency in wide-bandgap iPSCs (1.67 eV) with a Voc of 1.268 V and FF of 86.8%, leading to a certified efficiency of 23.42%.
- Demonstrated high-efficiency semi-transparent devices and a mechanically stacked four-terminal perovskite/silicon tandem solar cell reaching 30.97% efficiency.
Conclusions:
- The blended SAM strategy effectively optimizes the interface in iPSCs, overcoming limitations of individual SAMs.
- Precise energy-level tuning via blended SAMs is a viable approach for enhancing solar cell performance.
- This method significantly advances the efficiency of both single-junction iPSCs and perovskite/silicon tandem solar cells, paving the way for next-generation photovoltaics.
