KES3-1565
Dry-processed surface passivation approach using polymeric materials for highly efficient perovskite-silicon tandem solar cells
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Chang Kook Hong (Chonnam National University)
Co-Author(s)
Abstract
Monolithic, two-terminal perovskite-silicon tandem solar cells demonstrate a dramatic advancement in power conversion efficiency (PCE) compared to their single-junction counterparts. However, bilayer electron or hole transporting layers (ETLs/HTLs) and multi-layer polymeric passivation materials play a critical role in minimizing non-radiative recombination. In this investigation, we explored the influence of a dry-processed nickel oxide/self-assembled monolayer (NiOx/SAM) HTL and a dry-processed ultrathin lithium fluoride (LiF) layer combined with a short-chain ethylenediammonium diiodide (EDAI2) molecular layer as a bilayer passivation strategy for highly efficient monolithic tandem solar cells. A silicon heterojunction (SHJ) bottom cell and a 1.68 eV wide-bandgap (WBG) perovskite top absorber were integrated using this bilayer deposition approach and an interconnecting layer (ICL). The optimized tandem solar cell-configured as Ag/c-Si/ICL/bilayer HTL/WBG perovskite/bilayer ETL/IZO/Cu demonstrated an impressive open-circuit voltage (VOC) of 1.895 V, yielding a PCE of 31.61%. Furthermore, stability assessments following the ISOS protocols revealed that the unencapsulated tandem device exhibited exceptional ambient stability, retaining approximately 95% of its initial efficiency after 1,000 hours of continuous maximum power point (MPP) tracking under 1-sun illumination. We believe this work establishes a promising strategy for suppressing non-radiative recombination using bilayer configurations to realize highly stable, high-performance tandem solar cells.
