Spray-coated perovskite hemispherical photodetector featuring narrow-band and wide-angle imaging.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36243753.
- Also identified by DOI 10.1038/s41467-022-33934-1 and PMC identifier 9569351.
- 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
Sphere imagers featuring specific wavelength recognition and wide-angle imaging are required to meet the fast development of modern technology. However, it is still challenging to deposit high-quality photosensitive layers on sphere substrates from low-cost solution processes. Here we report spray-coated quasi-two-dimensional phenylethylammonium/formamidinium lead halide (PEA<sub>2</sub>FA<sub>n-1</sub>Pb<sub>n</sub>X<sub>3n+1</sub>) perovskite hemispherical photodetectors. The crystallization speed is manipulated by perovskite compositions, and the film thickness can be controlled by spray-coating cycles and solution concentration from tens of nanometers to hundreds of micrometers with a fast velocity of 1.28 × 10<sup>-4</sup> cm<sup>3</sup> s<sup>-1</sup>. The lens-free hemispherical photodetectors allow light response at a wide incident angle of 180°. Simultaneously, the wavelength selective response from visible to the near-infrared range is achieved with full width at half maximums (FWHMs) of ~20 nm, comparable to single-crystal devices. Wide-angle and wavelength-selective imaging are also demonstrated, which can find potential applications in intelligent recognition and intraoperative navigated surgery.