Photoconductive Thin Films Composed of Environmentally Benign AgBiS<sub>2</sub> Nanocrystal Inks Obtained through a Rapid Phase Transfer Process

Kelley, Mathew L.; Ahmed, Fiaz; Abiodun, Sakiru L.; Usman, Mohammad; Jewel, Mohi Uddin; Hussain, Kamal; Loye, Hans-Conrad zur; Chandrashekhar, M. V. S.; Greytak, Andrew B.

doi:10.1021/acsaelm.0c01107

Cited by 8 publications

(8 citation statements)

References 33 publications

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“…11,20 Additionally, NC-based electronic inks often depend on solution-phase ligand exchange with small molecules that require stabilization in polar organic solvents as they lack the steric stabilization capabilities of typical native ligands. 110,111 For example, 3-mercaptopropionic acid (MPA) is one of the most explored short organic ligands for PbS NCs. 112,113 Its carboxylate group can help to confer solubility in polar liquids via hydrogen bonding and/or charge stabilization.…”

Section: Overview Of Surface Coordination In Nonpolar and Polar Solve...mentioning

confidence: 99%

“…Recent work in our group has highlighted the successful biphasic solution-phase exchange of PbS and ternary AgBiS 2 NCs to form inks for single deposition thin film fabrication. 10,158 Studies in polar organic solvents may also aid in prototyping surface chemistry that is aimed at biomedical applications in water. 83…”

Section: Overview Of Surface Coordination In Nonpolar and Polar Solve...mentioning

confidence: 99%

“…224 Such cooperativity could help to explain the success of fluorocinnamic acids in preparation of stable PbS and AgBiS 2 NC inks. 158 A limitation of the Fowler model is that it only considers association of a single type of ligand and the value of the interaction free energy obtained may be difficult to compare directly to computational results or structure-based estimates of ligand size. We are unaware of examples of the Fowler isotherm applied to NC ITC studies, but note that isotherms would be sensitive to entropic and enthalpic contributions to W .…”

Section: Thermodynamic Modelsmentioning

confidence: 99%

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Thermodynamics of nanocrystal–ligand binding through isothermal titration calorimetry

et al. 2022

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Section: Overview Of Surface Coordination In Nonpolar and Polar Solve...mentioning

confidence: 99%

Section: Overview Of Surface Coordination In Nonpolar and Polar Solve...mentioning

confidence: 99%

Section: Thermodynamic Modelsmentioning

confidence: 99%

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Thermodynamics of nanocrystal–ligand binding through isothermal titration calorimetry

et al. 2022

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“…[ 14–16 ] Solution‐phase ligand‐exchange method has been recently introduced into AgBiS 2 NCs, yet their performance has been lower than their solid‐state ligand‐exchanged counterparts. [ 7,17 ] Here, we report a facile solution‐phase ligand‐exchange method for the production of AgBiS 2 inks employing 3‐mercaptopropionic acid (MPA) and methanol (MeOH) as the ligand and solvent pair. The resultant MPA capped nanocrystals can be easily dissolved in water, rendering the final ink used for device fabrication, completely environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly AgBiS₂ Nanocrystal Inks for Efficient Solar Cells Employing Green Solvent Processing

Wang

Peng

Wang

et al. 2022

Advanced Energy Materials

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Solution-phase ligand-exchange process happens between two immiscible solvent phases, for one phase being nonpolar to dissolve organic ligands capped nanocrystals and the other being polar, with high dielectric constants, to provide effective screening of electrostatic attraction between oppositely charged ions. [6] Currently, the most widely used solvents in solution-phase ligand-exchange procedures are formamide (FA), N,N-dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO). [3,[7][8][9] However, these polar solvents are highly toxic, raising major concerns on overall environmental impact. [10] Moreover, occupational safety must be taken into account for operators in manufacturing or scientists in the lab, who may come into direct contact with the ink or inhale solvent fumes during fabrication. Investigation of alternatives for ink preparation and device fabrications offers an invaluable opportunity toward safe and upscalable photovoltaic manufacturing techniques. [11][12][13] Silver bismuth sulfide nanocrystals (AgBiS 2 NCs), in view of their favorable bandgap, high absorption and absence of toxic RoHS elements, are promising solution-processable materials for photovoltaic applications. [14][15][16] Solution-phase ligand-exchange method has been recently introduced into AgBiS 2 NCs, yet their performance has been lower than their solid-state ligand-exchanged counterparts. [7,17] Here, we report a facile solution-phase ligand-exchange method for the production of AgBiS 2 inks employing 3-mercaptopropionic acid (MPA) and methanol (MeOH) as the ligand and solvent pair. The resultant MPA capped nanocrystals can be easily dissolved in water, rendering the final ink used for device fabrication, completely environmentally friendly. Furthermore, implementing AgBiS 2 nanocrystal inks into fully green-processed photovoltaic devices, an efficiency up to 7.3% was achieved, along with superior air stability. Results and DiscussionThe AgBiS 2 nanocrystals are first synthesized following a standard air-free Schlenk line technique with oleic acid as the surface ligands. [14,16] Prior to the ligand exchange, nanocrystals were dispersed in octane, and 3-mercaptopropionic acid (3-MPA) was dissolved in methanol as ligand solution, as shown in Figure 1. The nanocrystal/octane was then mixed with MPA/methanol vigorously and the two phases became Silver bismuth sulfide nanocrystals (AgBiS 2 NCs) are emerging absorber materials for low-cost solar cells, owing to their solution-processability, environmentally friendliness, earth abundance, and high absorption coefficients. When it comes to green manufacturing technologies, besides the semiconductor materials, solvents play an equally important role. Here, solution-phase ligand-exchanged (SPLE) AgBiS 2 nanocrystal inks employing 3-mercaptopropionic (MPA) in methanol as a ligand solution are introduced. The resultant MPA capped AgBiS 2 nanocrystals can be fully dissolved in water, forming completely environmentally friendly nanocrystal inks. These nanocrystal inks allow the fabricatio...

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“…Currently, power conversion efficiencies of AgBiS 2 based solar cells up to 6-9% are reported. [2,[26][27][28][29][30][31][32][33][34][35][36][37] Metal dithiocarbamates have been applied as precursors for the formation of ultrathin films via solution-based deposition and subsequent decomposition of the precursors [38] and for the formation of AgBiS 2 nanocrystals via a heat up method with the use of oleylamine (OM). [39] Moreover, metal xanthates are typically also versatile single source precursors for the preparation of metal sulfide nanocrystals via colloidal synthesis routes.…”

Section: Introductionmentioning

confidence: 99%

A Colloidal Synthesis Route Towards AgBiS₂ Nanocrystals Based on Metal Xanthate Precursors

et al. 2022

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Silver bismuth sulfide (AgBiS 2 ) is showing impressive thermoelectric and photovoltaic properties and has a high potential to replace toxic cadmium or lead containing semiconductors in many applications. Herein, we report on a synthesis route for AgBiS 2 nanocrystals applying metal xanthates as precursors. Silver xanthates could not be used so far in solution-based syntheses for Ag-containing metal sulfide nanocrystals as they are typically insoluble in organic solvents. An investigation of the synthesis process revealed that even though the silver xanthate is not soluble in the used solvent mixture consisting of octadecene and oleylamine, the decomposition of both precursors and the formation of AgBiS 2 nanocrystals is initiated already at room temperature by the amine functionality of the ligand. At room temperature, primary crystallite sizes of approximately 4 nm are observed and at a reaction temperature of 200 °C, the size of the AgBiS 2 nanocrystals increases to 7-8 nm.

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Photoconductive Thin Films Composed of Environmentally Benign AgBiS₂ Nanocrystal Inks Obtained through a Rapid Phase Transfer Process

Cited by 8 publications

References 33 publications

Thermodynamics of nanocrystal–ligand binding through isothermal titration calorimetry

Thermodynamics of nanocrystal–ligand binding through isothermal titration calorimetry

Environmentally Friendly AgBiS₂ Nanocrystal Inks for Efficient Solar Cells Employing Green Solvent Processing

A Colloidal Synthesis Route Towards AgBiS₂ Nanocrystals Based on Metal Xanthate Precursors

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Photoconductive Thin Films Composed of Environmentally Benign AgBiS2 Nanocrystal Inks Obtained through a Rapid Phase Transfer Process

Cited by 8 publications

References 33 publications

Thermodynamics of nanocrystal–ligand binding through isothermal titration calorimetry

Thermodynamics of nanocrystal–ligand binding through isothermal titration calorimetry

Environmentally Friendly AgBiS2 Nanocrystal Inks for Efficient Solar Cells Employing Green Solvent Processing

A Colloidal Synthesis Route Towards AgBiS2 Nanocrystals Based on Metal Xanthate Precursors

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Photoconductive Thin Films Composed of Environmentally Benign AgBiS₂ Nanocrystal Inks Obtained through a Rapid Phase Transfer Process

Environmentally Friendly AgBiS₂ Nanocrystal Inks for Efficient Solar Cells Employing Green Solvent Processing

A Colloidal Synthesis Route Towards AgBiS₂ Nanocrystals Based on Metal Xanthate Precursors