Multifunctional Additive CdAc<sub>2</sub> for Efficient Perovskite-Based Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 37226815.
- Also identified by DOI 10.1002/adma.202211806.
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Abstract
Polycrystalline perovskite films fabricated on flexible and textured substrates often are highly defective, leading to poor performance of perovskite devices. Finding substrate-tolerant perovskite fabrication strategies is therefore paramount. Herein, this study shows that adding a small amount of Cadmium Acetate (CdAc<sub>2</sub> ) in the PbI<sub>2</sub> precursor solution results in nano-hole array films and improves the diffusion of organic salts in PbI<sub>2</sub> and promotes favorable crystal orientation and suppresses non-radiative recombination. Polycrystalline perovskite films on the flexible substrate with ultra-long carrier lifetimes exceeding 6 µs are achieved. Eventually, a power conversion efficiency (PCE) of 22.78% is obtained for single-junction flexible perovskite solar cells (FPSCs). Furthermore, it is found that the strategy is also applicable for textured tandem solar cells. A champion PCE of 29.25% (0.5003 cm<sup>2</sup> ) is demonstrated for perovskite/silicon tandem solar cells (TSCs) with CdAc<sub>2</sub> . Moreover, the un-encapsulated TSCs maintains 109.78% of its initial efficiency after 300 h operational at 45 °C in a nitrogen atmosphere. This study provides a facile strategy for achieving high-efficiency perovskite-based solar cells.