In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 11, No. 30 ( 2023), p. 10310-10323
Abstract:
Transition metal dichalcogenide (TMDC)/metal halide perovskite photodetectors provide a promising new route for the realization of high-performance photodetectors owing to their unique optoelectronic features. However, previous studies mostly focused on vertically stacked TMDC/perovskite heterostructures and only on relatively thick perovskites (over 100 nm), whereby a large imbalance between the thicknesses of the perovskite and TMDC monolayer exists, which hinders further exploration of interface interactions from a possible coupling between the two components. Moreover, normally toxic Pb-based, not benign Sn-based, ones are widely reported. In this study, chemical vapor deposition (CVD)-grown WS 2 /thermally evaporated CsSnBr 3 photodetectors with a planar structure were fabricated and their photoresponse, as well as their photophysical properties and morphology and structure characteristics, were investigated. A robust WS 2 triangular domain with an edge length around 120 μm was generated on Si/SiO 2 via tuning the CVD process whereby an apparent selective deposition of CsSnBr 3 with a preferential (200) orientation on WS 2 could be achieved. A superior photoresponse compared to the isolated monolayer WS 2 and CsSnBr 3 films was demonstrated, which could be ascribed to the facilitation of the separation of the photogenerated electron–hole pairs due to the formation of a type-II band alignment at the WS 2 /CsSnBr 3 junction. Exciton dynamics analysis confirmed such carriers were transferring across the interface, especially an excessive receipt of holes in the monolayer WS 2 . The thickness of CsSnBr 3 had a critical influence on the photoresponse, whereby 50 nm CsSnBr 3 realized the optimal balance between the light absorbance and built-in potential effect. Our study provides a simple way to obtain TMDC/Sn-based metal halide perovskite photodetectors.
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702245-6
