Controllable synthesis and crystal facet, composition and temperature dependent gas sensing properties of Sn1−xS-CdS superlattice nanowires with ultrafast response

Ultrafast Hole Migration at the p–n Heterojunction of One-Dimensional SnS Nanorods and Zero-Dimensional CdS Quantum Dots

“…Earlier, Wang et al reported that Sn 0.38 S-CdS superlattice nanowires display efficient gas-sensing behavior. 14 Cho et al measured the efficiency of 4.22% for SnS@CdS thinfilm solar cells by improving the interface quality of the heterojunction, which is still far below the theoretical Shockley−Queisser limit. 23 In order to improvise the fabrication of the junction and enhance the device performance, it is of paramount importantance to study the photophysics of generated charge carriers involved at the interface of this SnS NR and CdS QD heterostructure.…”

“…Earlier, Wang et al. reported that Sn 0.38 S-CdS superlattice nanowires display efficient gas-sensing behavior . Cho et al.…”

“…Semiconductor p–n heterojunctions are a basic building block for any optoelectronic and technological application. − It improves the charge separation as well as the carrier transport and hence increases the lifetime of carriers by preventing excitonic recombination, which is highly desirable for device applications. Among them, 1D (IV–VI) p-type tin sulfide (SnS) has emerged as one of the promising candidate for its numerous applications, including photovoltaics, photocatalysis, and next-generation energy storage devices, , owing to its unique properties such as high stability and tunable band gap, higher optical absorption coefficient (>10 4 cm –1 ), and nontoxic and earth abundant elements. , Moreover, 1D semiconductor heterostructures demonstrate a large surface-to-volume ratio, which provides a large number of active sites that results in outstanding photocatalytic, optoelectronic, and gas-sensing properties. − Recently, SnS has been widely used as an active absorber material in solar cell devices . However, pristine SnS frequently suffers from low charge separation efficiency and trapping of charge carriers, which seriously affect the practical application of photocatalysis.…”