Tailoring of a visible-light-absorbing biaxial ferroelectric towards broadband self-driven photodetection.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33436587.
- Also identified by DOI 10.1038/s41467-020-20530-4 and PMC identifier 7804191.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
In terms of strong light-polarization coupling, ferroelectric materials with bulk photovoltaic effects afford a promising avenue for optoelectronic devices. However, due to severe polarization deterioration caused by leakage current of photoexcited carriers, most of ferroelectrics are merely capable of absorbing 8-20% of visible-light spectra. Ferroelectrics with the narrow bandgap (<2.0 eV) are still scarce, hindering their practical applications. Here, we present a lead-iodide hybrid biaxial ferroelectric, (isopentylammonium)<sub>2</sub>(ethylammonium)<sub>2</sub>Pb<sub>3</sub>I<sub>10</sub>, which shows large spontaneous polarization (~5.2 μC/cm<sup>2</sup>) and a narrow direct bandgap (~1.80 eV). Particularly, the symmetry breaking of 4/mmmFmm2 species results in its biaxial attributes, which has four equivalent polar directions. Accordingly, exceptional in-plane photovoltaic effects are exploited along the crystallographic [001] and [010] axes directions inside the crystallographic bc-plane. The coupling between ferroelectricity and photovoltaic effects endows great possibility toward self-driven photodetection. This study sheds light on future optoelectronic device applications.