Highly Efficient Monolithic Perovskite/Perovskite/Silicon Triple-Junction Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 38190828.
- Also identified by DOI 10.1002/adma.202311595.
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Abstract
Wide-bandgap metal halide perovskites have demonstrated promise in multijunction photovoltaic (PV) cells. However, photoinduced phase segregation and the resultant low open-circuit voltage (V<sub>oc</sub>) have greatly limited the PV performance of perovskite-based multijunction devices. Here, a alloying strategy is reported to achieve uniform distribution of triple cations and halides in wide-bandgap perovskites by doping Rb<sup>+</sup> and Cl<sup>-</sup> with small ionic radii, which effectively suppresses halide phase segregation while promoting the homogenization of surface potential. Based on this strategy, a V<sub>oc</sub> of 1.33 V is obtained from single-junction perovskite solar cells, and a V<sub>OC</sub> approaching 3.0 V and a power conversion efficiency of 25.0% (obtained from reverse scan direction, certified efficiency: 24.19%) on an 1.04 cm<sup>2</sup> photoactive area can be achieved in a perovskite/perovskite/c-Si triple-junction tandem cell, where the certification efficiency is by far the greatest performance of perovskite-based triple-junction tandem solar cells. This work overcomes the performance deadlock of perovskite-based triple-junction tandem cells by setting a materials-by-design paradigm.