Inverted Wide-Bandgap 2D/3D Perovskite Solar Cells with >22% Efficiency and Low Voltage Loss.
basic_science · Level V
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- Record sourced from PubMed, PMID 37431747.
- Also identified by DOI 10.1021/acs.nanolett.3c01962.
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Abstract
Wide-bandgap perovskites play a key role in high-performance tandem solar cells, which have the potential to break the Schockley-Queisser limit. Here, a 2D/3D hybrid wide-bandgap perovskite was developed using octane-1,8-diaminium (ODA) as spacer. The incorporation of the ODA spacer can not only significantly reduce charge carrier nonradiative recombination loss but also inhibit phase separation. Moreover, with a synergy effect using butylammonium iodide (BAI) as a surface defect passivator, both the phase stability and device performance were further improved. Compared to the control inverted device with a <i>V</i><sub>OC</sub> of 1.16 V and a PCE of 18.50%, the optimized PSCs based on a surface processed 2D/3D perovskite exhibit a superior high <i>V</i><sub>OC</sub> of 1.26 V and a champion PCE of 22.19%, which is a record efficiency for wide-bandgap PSCs (<i>E</i><sub>g</sub> > 1.65 eV). This work provides a very effective strategy to suppress phase separation in wide-bandgap perovskites for highly efficient and stable solar cells.