A synthetic platform for industrially
applicable two-dimensional
(2D) semiconductors that addresses the paramount issues associated
with large-scale production, wide-range photosensitive materials,
and oxidative stability has not yet been developed. In this study,
we attained the 6 in. scale production of 2D SnSe semiconductors with
spatial homogeneity using a rational synthetic platform based on the
thermal decomposition of solution-processed single-source precursors.
The long-range structural and chemical homogeneities of the 2D SnSe
layers are manifested using comprehensive spectroscopic analyses.
Furthermore, the capability of the SnSe-based photodetectors for broadband
photodetection is distinctly verified. The photoresponsivity and detectivity
of the SnSe-based photodetectors are 5.89 A W–1 and
1.8 × 1011 Jones at 532 nm, 1.2 A W–1 and 3.7 × 1010 Jones at 1064 nm, and 0.14 A W–1 and 4.3 × 109 Jones at 1550 nm, respectively.
The minimum rise times for the 532 and 1064 nm lasers are 62 and 374
μs, respectively. The photoelectrical analysis of the 5 ×
5 SnSe-based photodetector array reveals 100% active devices with
95.06% photocurrent uniformity. We unequivocally validated that the
air and thermal stabilities of the photocurrent yielded from the SnSe-based
photodetector are determined to be >30 d in air and 160 °C,
respectively,
which are suitable for optoelectronic applications.
Two-dimensional transition metal dichalcogenide (2D TMD) crystals are versatile platforms for realizing emergent optoelectronic devices. However, the ability to produce large-area 2D TMDs with spatial homogeneity and to accomplish broadband photodetection by tuning the operating wavelengths in photodetectors are two paramount prerequisites for practical applications of 2D TMD-based photodetectors. Here, we demonstrated all-solution-processed broadband photodetectors based on the wafer-scale perovskite quantum dots (PQDs)/MoS2 through light management via the monochromatization effect of the PQDs. The photodetectors exhibited broadband photodetection behavior that retained high photocurrents over a wide spectral range (254, 365, and 532 nm) by enhancing the photoresponse in the UV region through light management via the monochromatization effect of the PQDs. This intriguing strategy was proven with (i) electrical isolation realized by inserting an Al2O3 insulator between the PQDs and MoS2 and (ii) alteration of the PQD density. The rational nanohybrid-based photodetectors also exhibited superb air stability and exceptional bending durability.
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