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 IEK-5, 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:

  1. 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
  2. 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
  3. 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
  4. 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

Last Modified: 06.10.2023