Phase‐Modulated Band Alignment in CdS Nanorod/SnS<sub>x</sub> Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting

Fu, Yanming; Cao, Fengren; Wu, Fangli; Diao, Zhidan; Chen, Jie; Shen, Shaohua; Li, Liang

doi:10.1002/adfm.201706785

Cited by 107 publications

(55 citation statements)

References 50 publications

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“…[42,43] [42,44] and summarized in Table S3 in the Supporting Information. [42,43] [42,44] and summarized in Table S3 in the Supporting Information.…”

Section: Photodetectorsmentioning

confidence: 99%

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

et al. 2019

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possess lower dark currents and higher detectivities. In spite of great progresses, it is complicated to fabricate composite electronic transport layers (ETLs) with matched crystal lattices and energy levels, otherwise the newly formed interface in the composite may bring about large amounts of defects which act as trap sites and recombination centers.Spatially graded composition (bandgap) is an effective route to continuously tune energy levels and bandgap in semiconductors, [20,21] in which the interfacial recombination is alleviated or removed and a graded built-in potential through the whole bulk is produced, enabling stronger separation capability of photogenerated electron-hole pairs. This concept provides a new platform for designing high-performance optoelectronic devices. For example, Krol and co-workers fabricated the gradient W-doped BiVO 4 as a photoanode of photoelectrochemical cell. [22] Compared to the homogeneously doped BiVO 4 , the continuous built-in band bending induces the directional transfer of photogenerated holes from core to surface and thus increases the carrier separation efficiency to 60%. Tailoring the gradient bandgap from 0.35 to 1.42 eV, Pan and co-workers synthesized InAs x P 1-x nanosheets for band-selective infrared photodetectors. [23] We reported graded CdS x Se 1-x nanobelt solar cells by utilizing continuous stepped energy levels to drive electrons and holes toward opposite direction. [24] In p-i-n structured devices, [25][26][27][28] graded composition (bandgap) is basically used in the main photosensitive layer, for which the narrow bandgap region increases the absorption wavelength range, the large bandgap results in a high voltage output, and graded bandgap structure promotes the carriers transport. Inspired by previous results, with the introduction of gradient built-in band bending at the charge extraction layer/perovskite interface, the energy band offset is expected to provide the driving force for enhanced carrier separation, suppressed electron reflux, and reduced recombination, boosting the performance of perovskite photodetectors.In this work, we present a high-performance self-powered photodetector by integrating perovskite with gradient O-doped CdS nanorod array. For the first time, the continuous builtin band bending is introduced at the charge extraction layer/ perovskite interface to manipulate the transfer behavior of carriers in perovskite photodetectors. The optoelectronic measurements reveal that both the responsivity and the response speed of devices strongly depend on the structure of energy band bending. The optimum gradient O-doped CdS/perovskite Self-powered photodetectors are highly desired to meet the great demand in applications of sensing, communication, and imaging. Manipulating the carrier separation and recombination is critical to achieve high performance. In this paper, a self-powered photodetector based on the integrated gradient O-doped CdS nanorod array and perovskite is presented. Through optimizing the degree of continuous built-in ba...

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“…[42,43] [42,44] and summarized in Table S3 in the Supporting Information. [42,43] [42,44] and summarized in Table S3 in the Supporting Information.…”

Section: Photodetectorsmentioning

confidence: 99%

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

et al. 2019

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“…The V on shifts negatively to 0.16 Vf rom 0.39 V. Thephotoconversion efficiencies (h ABPE )under different bias voltages are calculated in the Supporting Information, Figure S11, indicating that SnS 2 -P has an obvious improvement over the measured potential range.F igure 3b shows the UV/Vis absorption curves and corresponding Tauc plots.S nS 2 -P exhibits higher light harvesting capability with stronger absorption and narrower E g (1.87 eV). [29] TheA rp lasma treated SnS 2 provides more surface-active sites and more reaction area than SnS 2 . Cyclic voltammograms in the non-Faradaic region (0.8-0.9 Vvs.…”

Section: Angewandte Chemiementioning

confidence: 99%

A Plasma‐Triggered O−S Bond and P−N Junction Near the Surface of a SnS₂ Nanosheet Array to Enable Efficient Solar Water Oxidation

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Ap hotoelectrochemical (PEC) cell can split water into hydrogen and oxygen with the assistance of solar illumination. However,i ts application is still limited by excessive bulk carrier recombination and sluggish surface oxygen evolution reaction (OER) kinetics.T aking SnS 2 as an example,apromising layered optoelectronic semiconductor, Ar plasma treatment strategy was used to introduce aSnS/SnS 2 PÀNheterojunction and OÀSbond near the surface of aSnS 2 nanosheet array,s imultaneously increasing the separation efficiency of photogenerated electron-hole pairs in the bulk and lowering the OER overpotential at the surface.T he onset potential of the plasma-treated SnS 2 nanosheet arrays hifts negatively to 0.16 V, and the photocurrent density at 1.23 Vvs. RHE boosts to 2.15 mA cm À2 ,which is 7times that of pristine SnS 2 .T his work demonstrates af acile plasma treatment strategy to modulate the energy band structure and surface chemical states for improved PEC performance.

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“…[3][4][5] As a narrow bandgap n-type semiconductor (2.4 eV), CdS has been widely studied as a typical PEC photoanode, owing to its visible-light absorption, high charge mobility, appropriate band position for water redox reaction. [18][19][20][21][22] The sulfide/sulfite ions as hole scavengers are always necessary for stable operation. [10][11][12][13][14][15][16][17] However, many studies have revealed that the PEC activity of pure CdS is severely limited because of the highly photogenerated carrier recombination.…”

Section: Introductionmentioning

confidence: 99%

Structure and Band Alignment Engineering of CdS/TiO₂/Bi₂WO₆ Trilayer Nanoflake Array for Efficient Photoelectrochemical Water Splitting

Chen

Tian

et al. 2019

ChemElectroChem

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Designing photoanode materials with desirable architecture and band alignment is essential for boosting photoelectrochemical (PEC) water splitting performance. Herein, a trilayer CdS/TiO 2 /Bi 2 WO 6 guest-host photoanode is designed and fabricated, in which highly-porous Bi 2 WO 6 nanoflake array serves as the host skeleton, while CdS nanoparticles function as superb visible light absorber. An ultrathin TiO 2 interlayer is rationally inserted between Bi 2 WO 6 and CdS, which not only assists the uniform growth of CdS, but also serves as a band-matching semiconductor to promote the charge transport. By optimizing the thickness of TiO 2 layer, the resulting trilayer photoanode exhibits higher PEC performance (2.62/4.91 mA cm À 2 at 1.23 V vs. reversible hydrogen electrode without/with the presence of hole scavenger) under AM 1.5G illumination compared with pristine CdS film. The enhancement of PEC performance is attributed to the enlarged surface area and superior light harvesting ability of the 3D nanoflake nanostructure, and improved charge transport efficiency resulting from the cascaded energy level structure.[a] C.

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Phase‐Modulated Band Alignment in CdS Nanorod/SnS_x Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting

Cited by 107 publications

References 50 publications

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

A Plasma‐Triggered O−S Bond and P−N Junction Near the Surface of a SnS₂ Nanosheet Array to Enable Efficient Solar Water Oxidation

Structure and Band Alignment Engineering of CdS/TiO₂/Bi₂WO₆ Trilayer Nanoflake Array for Efficient Photoelectrochemical Water Splitting

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Phase‐Modulated Band Alignment in CdS Nanorod/SnSx Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting

Cited by 107 publications

References 50 publications

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

A Plasma‐Triggered O−S Bond and P−N Junction Near the Surface of a SnS2 Nanosheet Array to Enable Efficient Solar Water Oxidation

Structure and Band Alignment Engineering of CdS/TiO2/Bi2WO6 Trilayer Nanoflake Array for Efficient Photoelectrochemical Water Splitting

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Product

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Phase‐Modulated Band Alignment in CdS Nanorod/SnS_x Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting

A Plasma‐Triggered O−S Bond and P−N Junction Near the Surface of a SnS₂ Nanosheet Array to Enable Efficient Solar Water Oxidation

Structure and Band Alignment Engineering of CdS/TiO₂/Bi₂WO₆ Trilayer Nanoflake Array for Efficient Photoelectrochemical Water Splitting