Dynamic aspects of CuInS2 light absorbing nanocrystal thin films

Vaccarello, Daniel; Hedges, Jason B.; Tapley, Amy; Love, David A.; Ding, Zhifeng

doi:10.1016/j.jelechem.2014.10.034

Cited by 9 publications

(11 citation statements)

References 36 publications

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“…Intensity modulated photocurrent spectroscopy (IMPS), a useful technique being widely implemented in dye‐sensitized solar cells, was employed to investigate the charge‐transport properties of the samples . The average transport time for photoexcited electrons to diffuse to the electrode can be estimated by the equation of

τ = (2 π f_{I M P s}

) −1 , where

τ

is the transit time and

f_{normalI normalM normalP normalS}

is the frequency at which the minimum in the IMPS plot occurs.…”

Section: Resultsmentioning

confidence: 99%

“…Intensity modulated photocurrent spectroscopy (IMPS), au seful technique being widely implemented in dye-sensitized solar cells, was employed to investigate the charge-transport properties of the samples. [53] The average transport time for photoexcited electrons to diffuse to the electrode can be estimated by the equation of t ¼ð2pf IMPs ) À1 ,w here t is the transit time and f IMPS is the frequency at which the minimum in the IMPS plot occurs. As seen in Figure 8c,t he electron-transport time for 2, 5, 10, and 30 min ZnO/Fe 2 O 3 NWs and PH 3 -treated 10 min ZnO/Fe 2 O 3 NWs, were estimatedt ob e0 .57, 0.46, 0.9, 1.2, and 0.38 ms, respectively.C ompared with the reported electron-transport times of 5-7 ms for TiO 2 nanoparticulate and nanotubular film [54] as well as dozens of milliseconds for WO 3 /BiVO 4 heterojunction film, [55] t values for ZnO/Fe 2 O 3 NWs are relatively short and can be ascribed to highere lectron mobility of ZnO as well as lower density of grain boundaries and recombination sites in ZnO NWs.…”

Section: Resultsmentioning

confidence: 99%

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Fe₂PO₅‐Encapsulated Reverse Energetic ZnO/Fe₂O₃ Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water

Qin

et al. 2017

ChemSusChem

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Zinc oxide is regarded as a promising candidate for application in photoelectrochemical water oxidation due to its higher electron mobility. However, its instability under alkaline conditions limits its application in a practical setting. Herein, we demonstrate an easily achieved wet-chemical route to chemically stabilize ZnO nanowires (NWs) by protecting them with a thin layer Fe O shell. This shell, in which the thickness can be tuned by varying reaction times, forms an intact interface with ZnO NWs, thus protecting ZnO from corrosion in a basic solution. The reverse energetic heterojunction nanowires are subsequently activated by introducing an amorphous iron phosphate, which substantially suppressed surface recombination as a passivation layer and improved photoelectrochemical performance as a potential catalyst. Compared with pure ZnO NWs (0.4 mA cm ), a maximal photocurrent of 1.0 mA cm is achieved with ZnO/Fe O core-shell NWs and 2.3 mA cm was achieved for the PH -treated NWs at 1.23 V versus RHE. The PH low-temperature treatment creates a dual function, passivation and catalyst layer (Fe PO ), examined by X-ray photoelectron spectroscopy, TEM, photoelectrochemical characterization, and impedance measurements. Such a nano-composition design offers great promise to improve the overall performance of the photoanode material.

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τ = (2 π f_{I M P s}

) −1 , where

τ

is the transit time and

f_{normalI normalM normalP normalS}

is the frequency at which the minimum in the IMPS plot occurs.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Fe₂PO₅‐Encapsulated Reverse Energetic ZnO/Fe₂O₃ Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water

Qin

et al. 2017

ChemSusChem

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“…Our solvothermal process for CZTS production has been shown to be an effective way of fabricating the NCs at low-cost [5,13,14]. The resultant NCs show a high consistency in composition and structure, producing predominantly the ideal kesterite structure with few secondary phases, though the relationship of the starting materials ratio against final compositions is not clear [14,15].…”

Section: Introductionmentioning

confidence: 99%

Controlling Cu2ZnSnS4 photocatalytic ability through alterations in sulfur availability

et al. 2016

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Cu 2 ZnSnS 4 (CZTS) nanocrystals (NCs) were made via a one-pot solvothermal method with various amounts of available free-sulfur and a fixed amount of sulfur bound to 2-mercapto-5-n-propylpyrimidine (MPP). Varying the sulfur availability yields CZTS NCs of different stoichiomety, from which five distinct samples were analyzed for consistency both microscopically and macroscopically. As revealed by X-ray absorption fine structure investigation, samples fabricated in the presence of decreased free-sulfur showed decreased CZTS character, with sporadic compositions and no long term order; however, when fabricated in the presence of no free-sulfur, sulfur from the degraded MPP was found incorporated into the CZTS structure. These NCs showed improved long-term order over standard synthetic procedure. The catalysis of methyl viologen (MV) from MV 2+ to MV + state by CZTS under light irradiation was used as the probe to test the photovoltaic nature. The photocatalysis was enhanced in the films made from NCs fabricated without available free-sulfur. This enhancement is consistent with the measured band gaps, with more ordered NCs showing a band gap that better matches the most intense regions of the solar spectrum.

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“…7,[9][10][11][12][13][14][15][16] Recently, our group has synthesized CIS nanocrystals (NCs) using a one-pot solvothermal method that avoids high-cost and dangerous techniques. [16][17][18] The NCs have been previously characterized photoelectrochemically and structurally. [17][18] The use of 2-mercapto-5-n-propylpyrimidine (MPP) as a capping ligand in place of the typical oleylamine eliminates the need of thermal removal for the device to produce photocurrent, making it a more cost-effective capping ligand.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18] The NCs have been previously characterized photoelectrochemically and structurally. [17][18] The use of 2-mercapto-5-n-propylpyrimidine (MPP) as a capping ligand in place of the typical oleylamine eliminates the need of thermal removal for the device to produce photocurrent, making it a more cost-effective capping ligand. 17 The interactions of this capping ligand with CIS will be addressed herein.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Band Structure of CuInS₂ Nanocrystals and Their Bonding with the Capping Ligand

et al. 2015

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CuInS 2 (CIS) nanocrystals (NCs) prepared optimally via a one-pot solvothermal method exhibit a high absorption coefficient and an ideal band gap for solar cell light-absorbing materials. We find that the initial Cu/In ratio in the synthesis determines the final composition of CIS and this further dictates the photoelectrochemical performance of the CIS NC films. X-ray absorption near edge spectroscopy excludes the presence of a secondary phase and suggests a difference in surface band bending and in ligand-CIS interaction. These findings will aid optimizing the design of CIS NC films to achieve the highest possible photovoltaic efficiency.

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Dynamic aspects of CuInS2 light absorbing nanocrystal thin films

Cited by 9 publications

References 36 publications

Fe₂PO₅‐Encapsulated Reverse Energetic ZnO/Fe₂O₃ Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water

Fe₂PO₅‐Encapsulated Reverse Energetic ZnO/Fe₂O₃ Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water

Controlling Cu2ZnSnS4 photocatalytic ability through alterations in sulfur availability

Assessing the Band Structure of CuInS₂ Nanocrystals and Their Bonding with the Capping Ligand

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Dynamic aspects of CuInS2 light absorbing nanocrystal thin films

Cited by 9 publications

References 36 publications

Fe2PO5‐Encapsulated Reverse Energetic ZnO/Fe2O3 Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water

Fe2PO5‐Encapsulated Reverse Energetic ZnO/Fe2O3 Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water

Controlling Cu2ZnSnS4 photocatalytic ability through alterations in sulfur availability

Assessing the Band Structure of CuInS2 Nanocrystals and Their Bonding with the Capping Ligand

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Product

Resources

About

Fe₂PO₅‐Encapsulated Reverse Energetic ZnO/Fe₂O₃ Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water

Fe₂PO₅‐Encapsulated Reverse Energetic ZnO/Fe₂O₃ Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water

Assessing the Band Structure of CuInS₂ Nanocrystals and Their Bonding with the Capping Ligand