A Flexible Plasmonic-Membrane-Enhanced Broadband Tin-Based Perovskite Photodetector.
basic_science · Level V
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- Record sourced from PubMed, PMID 34672605.
- Also identified by DOI 10.1021/acs.nanolett.1c03050.
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Abstract
Lead-free perovskite quantum dots (QDs) have been widely investigated for optoelectronic devices because of their excellent electrical and optical properties. However, optoelectronic devices based on such lead-free perovskites still have much lower performance than those made of Pb-based counterparts. Herein, we developed a lead-free photodetector with an enhanced broadband spectral response ranging from 300 to 630 nm. By balancing plasmonic near-field enhancement and surface energy quenching through precisely controlling the thickness of Al<sub>2</sub>O<sub>3</sub> spacer between the CsSnBr<sub>3</sub> QDs and silver nanoparticle membrane, the photodetector with 5 nm thick Al<sub>2</sub>O<sub>3</sub> experiences a maximum photocurrent enhancement of 6.5-fold at 410 nm, with a responsivity of 62.3 mA/W and detectivity of 4.27 × 10<sup>11</sup> Jones. Moreover, its photocurrent shows a negligible decrease after 100 cycles of bending, which is ascribed to the tension-offset induced by the self-assembled nanoparticle membrane. The proposed plasmonic membrane enhancement provides a great potential for high-performance perovskite optoelectronic devices.