Hot‐Injection Synthesized Ag<sub>2</sub>S Quantum Dots with Broad Light Absorption and High Stability for Solar Cell Applications

Öberg, Viktor; Zhang, Xiaoliang; Johansson, Erik M. J.

doi:10.1002/cnma.201800263

Cited by 21 publications

(15 citation statements)

References 42 publications

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“…According to the diffractogram in Figure b, all samples exhibit a cubic structure, previously described as the high-temperature β-phase as compared to the trigonal low-temperature phase described elsewhere . There is a small change in the relative intensity ratios for the (111) and (200) peaks as well as peak broadening indicative of nanocrystal size.…”

Section: Resultsmentioning

confidence: 67%

“…However, to avoid the issue of toxicity of Pb and Cd, new materials of nanocrystal and/or quantum dots are investigated. Such materials including Ag 2 S, − AgSbS 2 , Cu 2 S, and CuInS 2 may also be considered low toxic but are often used in combination with CdS . AgBiS 2 has also been studied as a solar cell material in a few reports and found to be of potential interest, − and solar cells based on NCs of this material have resulted in PCE above 6% .…”

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confidence: 99%

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Cubic AgBiS₂ Colloidal Nanocrystals for Solar Cells

Öberg

Johansson

Zhang

2020

ACS Appl. Nano Mater.

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Recent progress in colloidal quantum dot (CQD)-based solar cells indicates that low-toxicity materials such as AgBiS 2 nanocrystals (NCs) show potential in replacing toxic PbS and CdS CQDs in solar cell applications. In this study, an investigation on the importance of the composition and sensitivity toward synthesis conditions was performed by adjusting concentrations and ratios of Ag and Bi precursorsfirst, by varying the ratio of Ag toward Bi precursors and, second, by varying the concentration of Ag with a constant ratio toward Bi precursors in the solution. Furthermore, elemental XPS studies and TEM imaging together with solar cell analysis indicated a strong correlation between the concentration of Ag precursor and the NC properties and, moreover, the solar cell properties based on these NCs. In short, a large amount of Ag precursor resulted in smaller Ag-rich NCs, which resulted in solar cells with high photovoltage but low photocurrent density, while a lower amount of Ag precursor resulted in larger NCs and solar cells with a lower photovoltage. The Ag:Bi:S ratio of 0.72:0.9:1 resulted in almost stoichiometric NCs but with a slight excess of Ag, which in turn resulted in solar cells with the highest performance. This work therefore gives insight into how the elemental composition and size of the NCs can be tuned by the precursor ratios and how this, in turn, affects the performance of the solar cell devices.

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Section: Resultsmentioning

confidence: 67%

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confidence: 99%

Cubic AgBiS₂ Colloidal Nanocrystals for Solar Cells

Öberg

Johansson

Zhang

2020

ACS Appl. Nano Mater.

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“…Furthermore, considering Ag 2 S and CdS are also commonly used materials in photovoltaic devices 32,33 , we further explored the synthesis of halide capped Ag 2 S and CdS NCs. With some modifications (See the “Methods” section), Accanthite phase Ag 2 S NCs and Hawleyite phase CdS NCs were successfully synthesized (Supplementary Figs.…”

Section: Resultsmentioning

confidence: 99%

Room-temperature direct synthesis of semi-conductive PbS nanocrystal inks for optoelectronic applications

et al. 2019

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Lead sulphide (PbS) nanocrystals (NCs) are promising materials for low-cost, high-performance optoelectronic devices. So far, PbS NCs have to be first synthesized with long-alkyl chain organic surface ligands and then be ligand-exchanged with shorter ligands (two-steps) to enable charge transport. However, the initial synthesis of insulated PbS NCs show no necessity and the ligand-exchange process is tedious and extravagant. Herein, we have developed a direct one-step, scalable synthetic method for iodide capped PbS (PbS-I) NC inks. The estimated cost for PbS-I NC inks is decreased to less than 6 $·g−1, compared with 16 $·g−1 for conventional methods. Furthermore, based on these PbS-I NCs, photodetector devices show a high detectivity of 1.4 × 1011 Jones and solar cells show an air-stable power conversion efficiency (PCE) up to 10%. This scalable and low-cost direct preparation of high-quality PbS-I NC inks may pave a path for the future commercialization of NC based optoelectronics.

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“…Nanocrystals (NCs) composed of InX (X = P, As, or Sb) − and CuInX 2 (X = S or Se) have no IR absorption and contain the rare-element indium. Ag 2 S QDs have a tunable absorption band spanning from the visible to the near-infrared region, and Ag 2 S QDSCs exhibit the highest reported power conversion efficiency (PCE) of 2.21% and good stability . However, a large exciton binding energy of 96 meV adversely affects the performance of Ag 2 S QDSCs .…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly AgBiS₂ Nanocrystal/ZnO Nanowire Heterojunction Solar Cells with Enhanced Carrier Collection Efficiency

Xiao

Wang

Awai

et al. 2021

ACS Appl. Mater. Interfaces

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AgBiS 2 nanocrystals (NCs) are nontoxic, lead-free, and near-infrared absorbing materials. Eco-friendly solar cells were constructed using interdigitated layers of ZnO nanowires (NWs) and AgBiS 2 NCs, with the aim of elongating the otherwise short carrier diffusion length of the AgBiS 2 NC assembly. AgBiS 2 NCs were uniformly infiltrated into the ZnO NW layers using a low-cost and easily scalable dip coating method. The resulting ZnO NW/AgBiS 2 NC interdigitated structures provided efficient carrier pathways in constructed nanowire solar cells (NWSCs), composed of a transparent electrode/ZnO NW/AgBiS 2 NC interdigitated layer/P3HT hole transport layer/Au. The photocurrent external quantum efficiency (EQE) in the visible to nearinfrared regions was enhanced compared to those of the control solar cells made with ZnO/AgBiS 2 tandem layered structures. The maximum EQE for the NWSCs reached 82% in the visible region, which is higher than the EQE values previously reported for solar cells fabricated with ZnO/AgBiS 2 NCs. Air stability tests on unsealed NWSCs demonstrated that 90% or more of the initial power conversion efficiency was maintained even after 6 months.

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Hot‐Injection Synthesized Ag₂S Quantum Dots with Broad Light Absorption and High Stability for Solar Cell Applications

Cited by 21 publications

References 42 publications

Cubic AgBiS₂ Colloidal Nanocrystals for Solar Cells

Cubic AgBiS₂ Colloidal Nanocrystals for Solar Cells

Room-temperature direct synthesis of semi-conductive PbS nanocrystal inks for optoelectronic applications

Eco-Friendly AgBiS₂ Nanocrystal/ZnO Nanowire Heterojunction Solar Cells with Enhanced Carrier Collection Efficiency

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Hot‐Injection Synthesized Ag2S Quantum Dots with Broad Light Absorption and High Stability for Solar Cell Applications

Cited by 21 publications

References 42 publications

Cubic AgBiS2 Colloidal Nanocrystals for Solar Cells

Cubic AgBiS2 Colloidal Nanocrystals for Solar Cells

Room-temperature direct synthesis of semi-conductive PbS nanocrystal inks for optoelectronic applications

Eco-Friendly AgBiS2 Nanocrystal/ZnO Nanowire Heterojunction Solar Cells with Enhanced Carrier Collection Efficiency

Contact Info

Product

Resources

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Hot‐Injection Synthesized Ag₂S Quantum Dots with Broad Light Absorption and High Stability for Solar Cell Applications

Cubic AgBiS₂ Colloidal Nanocrystals for Solar Cells

Cubic AgBiS₂ Colloidal Nanocrystals for Solar Cells

Eco-Friendly AgBiS₂ Nanocrystal/ZnO Nanowire Heterojunction Solar Cells with Enhanced Carrier Collection Efficiency