Crystalline TiO2 protective layer with graded oxygen defects for efficient and stable silicon-based photocathode

Zheng, Jianyun; Lyu, Yanhong; Wang, Ruilun; Xie, Chao; Zhou, Huaijuan; Jiang, San Ping; Wang, Shuangyin

doi:10.1038/s41467-018-05580-z

Cited by 190 publications

(133 citation statements)

References 49 publications

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“…The extra peak for C 1s at 284.8 eV was attributed to carbonaceous contaminants from the surroundings. [51] The two peaks had a difference of ≈5.7 eV, which was identical to the pure bulk anatase phase (5.7 eV). [51] The two peaks had a difference of ≈5.7 eV, which was identical to the pure bulk anatase phase (5.7 eV).…”

Section: Wwwadvmattechnoldementioning

confidence: 86%

Performance Enhancement of Graphene Photodetectors via In Situ Preparation of TiO₂ on Graphene Channels

Cheng

Yang

Huang

et al. 2018

Adv Materials Technologies

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modulators, [14,15] and photodetectors. [16][17][18][19][20] The combination of a broadband lightabsorption range (from far-infrared to ultraviolet ranges in theory [21] ) and ultrahigh carrier mobility (1 000 000 cm 2 V −1 s −1 in experiment [22] ) makes graphene a star contender for photodetection applications. [16][17][18][19][20]23] The first reported spatial graphene photodetector (GPD) achieved a bandwidth of ≈40 GHz, and the ultrahigh intrinsic operation speeds could be well over 500 GHz, surpassing state-of-the-art PDs based on other materials. [16] However, the uniform 2.3% optical absorption of graphene limits the photoresponsivity of GPDs to several mA W −1 . [16,17] To enhance the optical absorption of graphene and thus the photoresponsivity of GPDs, microcavities, [24] plasmon resonators, [25] and silicon optical waveguides [18][19][20]26,27] have been utilized, but these structures weaken the broadband characteristic of GPDs. Another method carried out by fabricating a hybrid photodetector consisting of graphene covered by a thin film of colloidal quantum dots greatly improves the photoresponsivity from visible to near-infrared ranges. [28] However, the operation stability of this kind of GPD may not be satisfactory due to the air instability of colloidal quantum dots and the "dirty" interface between graphene and the cover layer. Moreover, colloidal quantum dots cannot be obtained with complementary metal-oxide-semiconductor (CMOS)-compatible fabrication processes, which are critical for low-cost devices. Hence, new methods should be proposed to achieve a CMOS-compatible broadband GPD with high photoresponsivity and high operation stability.TiO 2 nanomaterials have attracted considerable attention for applications in optoelectronic devices, [29] solar cells, [30] and photocatalysts [31] due to their advantages such as nontoxicity, low cost, chemical and thermal stability, and resistance to photocorrosion. [32][33][34] TiO 2 nanomaterials have been widely used as a shielding layer to prevent penetration of water molecules and oxygen gas. [35,36] Thus, thin TiO 2 films with low gas permeabilities can be excellent protection layers for graphene in high-stability GPDs. TiO 2 has three polymorphs: rutile, anatase, and brookite. [37] The metastable anatase form shows better performance in energy-related applications and optoelectronics because its formation temperature is relatively low and numerous intrinsic point defects exist in incomplete lattices. [38] Photodetectors Graphene, a single sheet of carbon atoms in a hexagonal lattice, [1] has captured extensive research interest due to its excellent mechanical, [2] thermal, [3] electronic, [1,4] and optical properties. [5,6] Due to its unique band structure, graphene shows ultrahigh carrier mobility, tunable transport polarity, and tunable broadband absorption, which make graphene a very promising candidate for use in electronic, photonic, and optoelectronic applications, such as transistors, [7] frequency multipliers, [8,9] frequency mixers, [10][11][1...

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Section: Wwwadvmattechnoldementioning

confidence: 86%

Performance Enhancement of Graphene Photodetectors via In Situ Preparation of TiO₂ on Graphene Channels

Cheng

Yang

Huang

et al. 2018

Adv Materials Technologies

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“…Elemental doping and introduction of vacancies are two effective routes to regulate the electronic structure and reduce the recombination. Doping can promote charge separation or create a doped overlayer for catalyzing the surface water oxidation reaction .…”

Section: Figurementioning

confidence: 99%

Simultaneous Manipulation of O‐Doping and Metal Vacancy in Atomically Thin Zn₁₀In₁₆S₃₄ Nanosheet Arrays toward Improved Photoelectrochemical Performance

et al. 2018

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The facile hydrothermal synthesis of Zn 10 In 16 S 34 atomically thin nanosheet arrays on fluorine-doped tin oxide glass (FTO) substrates is presented. Through controlling heat treatment in air,O -doping and Zn, Sv acancies were simultaneously introduced in Zn 10 In 16 S 34 nanosheets with adjusted phase,m orphology,c hemical compositions,a nd energy level distribution. The surface defect states are passivated by depositing ultrathin Al 2 O 3 film by atomic layer deposition technology.T he performance of Zn 10 In 16 S 34 photoanodes is largely improved, with 4.7 times higher current density and reduced onset potential. The experimental results and density functional theory calculations indicate that the enhancement is attributed to the fast photoexcited electron-hole pair separation, decreased surface transfer impedance,p rolonged carrier lifetime,a nd reduced overpotential of oxygen evolution reaction.

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“…[ 10–14 ] Recently, doping has been considered as an efficient strategy to improve the PEC performance because the dopants can effectively promote the charge separation by suppressing bulk recombination and enhance bulk carrier concentration. [ 15–18 ] In addition, doping could create a doped overlayer for accelerating the surface water splitting reaction. [ 19 ] Particularly, multi‐element doping can provide more active sites and reduce the overpotential of surface OER reaction, compared with single doping.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Metal Nanocluster Assisted Cu‐Ga‐Sn Tri‐Doping for Enhanced Photoelectrochemical Water Splitting of BiVO₄ Film

Wang

Zhang

et al. 2020

Adv Materials Inter

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Cu‐Ga‐Sn tri‐doped BiVO4 thin film is created by using a new multi‐metal chalcogenide molecular nanocluster as single‐source dopants. The modified BiVO4 photoanode with optimal doping amount (denoted as BiVO4‐CGS) shows the improved performance of photoelectrochemical (PEC) water splitting with a 220 mV cathodic shift in onset potential and photocurrent density of 2.5 mA cm−2 at 1.23 V versus reversible hydrogen electrode, which is 2.8 times higher than that of pristine BiVO4. The enhanced catalytic activity is attributed to the increased charge carrier density, the improved charge separation efficiency and the accelerated surface oxygen evolution reaction (OER) dynamics of photoelectrodes. It is noted that the doping method applied here demonstrates an effective approach in not only avoiding the problems of uneven distribution of multi‐dopants or phase separation occurring in regular method, but also implementing in‐situ multi‐metal doping in a simple way.

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Crystalline TiO2 protective layer with graded oxygen defects for efficient and stable silicon-based photocathode

Cited by 190 publications

References 49 publications

Performance Enhancement of Graphene Photodetectors via In Situ Preparation of TiO₂ on Graphene Channels

Performance Enhancement of Graphene Photodetectors via In Situ Preparation of TiO₂ on Graphene Channels

Simultaneous Manipulation of O‐Doping and Metal Vacancy in Atomically Thin Zn₁₀In₁₆S₃₄ Nanosheet Arrays toward Improved Photoelectrochemical Performance

Multi‐Metal Nanocluster Assisted Cu‐Ga‐Sn Tri‐Doping for Enhanced Photoelectrochemical Water Splitting of BiVO₄ Film

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Crystalline TiO2 protective layer with graded oxygen defects for efficient and stable silicon-based photocathode

Cited by 190 publications

References 49 publications

Performance Enhancement of Graphene Photodetectors via In Situ Preparation of TiO2 on Graphene Channels

Performance Enhancement of Graphene Photodetectors via In Situ Preparation of TiO2 on Graphene Channels

Simultaneous Manipulation of O‐Doping and Metal Vacancy in Atomically Thin Zn10In16S34 Nanosheet Arrays toward Improved Photoelectrochemical Performance

Multi‐Metal Nanocluster Assisted Cu‐Ga‐Sn Tri‐Doping for Enhanced Photoelectrochemical Water Splitting of BiVO4 Film

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Performance Enhancement of Graphene Photodetectors via In Situ Preparation of TiO₂ on Graphene Channels

Performance Enhancement of Graphene Photodetectors via In Situ Preparation of TiO₂ on Graphene Channels

Simultaneous Manipulation of O‐Doping and Metal Vacancy in Atomically Thin Zn₁₀In₁₆S₃₄ Nanosheet Arrays toward Improved Photoelectrochemical Performance

Multi‐Metal Nanocluster Assisted Cu‐Ga‐Sn Tri‐Doping for Enhanced Photoelectrochemical Water Splitting of BiVO₄ Film