Sub-1.4eV bandgap inorganic perovskite solar cells with long-term stability.
basic_science · Level V
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- Record sourced from PubMed, PMID 31919343.
- Also identified by DOI 10.1038/s41467-019-13908-6 and PMC identifier 6952449.
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Abstract
State-of-the-art halide perovskite solar cells have bandgaps larger than 1.45 eV, which restricts their potential for realizing the Shockley-Queisser limit. Previous search for low-bandgap (1.2 to 1.4 eV) halide perovskites has resulted in several candidates, but all are hybrid organic-inorganic compositions, raising potential concern regarding device stability. Here we show the promise of an inorganic low-bandgap (1.38 eV) CsPb<sub>0.6</sub>Sn<sub>0.4</sub>I<sub>3</sub> perovskite stabilized via interface functionalization. Device efficiency up to 13.37% is demonstrated. The device shows high operational stability under one-sun-intensity illumination, with T<sub>80</sub> and T<sub>70</sub> lifetimes of 653 h and 1045 h, respectively (T<sub>80</sub> and T<sub>70</sub> represent efficiency decays to 80% and 70% of the initial value, respectively), and long-term shelf stability under nitrogen atmosphere. Controlled exposure of the device to ambient atmosphere during a long-term (1000 h) test does not degrade the efficiency. These findings point to a promising direction for achieving low-bandgap perovskite solar cells with high stability.