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Tandem Solar Cells
About
The Tandem Solar Cell Team focuses on enhancing the efficiency, stability, and scalability of perovskite–silicon tandem solar cells by innovating and optimizing materials and processes in the perovskite top cell. A key part of our work is understanding how factors such as wafer texture, TCO surfaces, surface treatments, SAM molecules, passivation layers, and solvent quenching influence the crystallization of perovskite and, consequently, overall device performance. This is supported by advanced analytical methods and simulations. In addition, we employ machine learning approaches to accelerate the discovery and selection of new SAM materials, driving progress toward next-generation tandem solar technologies.
Research Topics
Perovskite/SHJ Tandem Solar Cells
With single-junction solar cells approaching the Shockley-Queisser limited conversion efficiency, integrating the wide bandgap top perovskite solar cells with crystalline bottom solar cells to form tandem solar cells is considered as a promising strategy for a better utilization of the solar spectrum, in order to further increase solar cell efficiency. In IMD-3, we aim at bringing our advantages in high efficiency silicon heterojunction (SHJ) solar cell and perovskite solar cell development together, to develop a perovskite/SHJ tandem technology with efficiency above 30%.
Research Topics:
- Optimization of the SHJ bottom cell
- High efficiency SHJ solar cells based on different wafer strategy, such as single-side textured wafer, two-side nano-sized textured wafer
- Soft deposition of transparent conductive layer
- Optimization of perovskite top cell
- Soft deposition of transparent electrodes
- Exploration of suitable hole transport layers (metal oxides, polymers, small molecules and self-assembled monolayers)
- Bandgap tuning by varying perovskite composition
- Electron transport layer process development via Atomic Layer Deposition (ALD) and/or spin coating techniques
- Optimization of tandem device
- Process development of perovskite deposition on different SHJ bottom cells
- Current matching between top and bottom cells
- Optimization of intermediate recombination layer
- Optimization of opto-electrical design for tandem by advanced device simulation
- Design of front and interlayers with micro-/nano-optical approaches
- Reduction of power losses at the interlayers by improved engineering of the layer stack
Team members
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Research institutions / facilities
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References
Last Modified: 27.08.2025