Nonlinear Band Gap Tunability in Selenium–Tellurium Alloys and Its Utilization in Solar Cells

Hadar, Ido; Hu, Xiaobing; Luo, Zhong‐Zhen; Dravid, Vinayak P.; Kanatzidis, Mercouri G.

doi:10.1021/acsenergylett.9b01619

Cited by 52 publications

(56 citation statements)

References 36 publications

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“…Elevated selenium levels can also be found in areas related to the manufacturing of glass, ceramics, solar cells, and pharmaceuticals (Yamamura et al, 2007;Srivastava and Mukhopadhyay, 2013;Santos et al, 2015;Sharma et al, 2015;Tan L. C. et al, 2016;Bailey, 2017;Hadar et al, 2019). Se can further be an issue in the disposal and recycling of batteries and other electronic waste products (Garlapati, 2016).…”

Section: Introductionmentioning

confidence: 99%

Fungal Bioremediation of Selenium-Contaminated Industrial and Municipal Wastewaters

et al. 2020

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Selenium (Se) is an essential element for most organisms yet can cause severe negative biological consequences at elevated levels. The oxidized forms of Se, selenate [Se(VI)] and selenite [Se(IV)], are more mobile, toxic, and bioavailable than the reduced forms of Se such as volatile or solid phases. Thus, selenate and selenite pose a greater threat to ecosystems and human health. As current Se remediation technologies have varying efficiencies and costs, novel strategies to remove elevated Se levels from environments impacted by anthropogenic activities are desirable. Some common soil fungi quickly remove Se (IV and VI) from solution by aerobic reduction to solid or volatile forms. Here, we perform bench-scale culture experiments of two Se-reducing Ascomycota to determine their Se removal capacity in growth media conditions containing either Se(IV) or Se(VI) as well as in Se-containing municipal (∼25 µg/L Se) and industrial (∼2000 µg/L Se) wastewaters. Dissolved Se was measured throughout the experiments to assess Se concentration and removal rates. Additionally, solid-associated Se was quantified at the end of each experiment to determine the amount of Se removed to solid phases (e.g., Se(0) nanoparticles, biomass-adsorbed Se, or internal organic selenoproteins). Results show that under optimal conditions, fungi more efficiently remove Se(IV) from solution compared to Se(VI). Additionally, both fungi remove a higher percentage of Se from the filtered municipal wastewater compared to the industrial wastewater, though cultures in industrial wastewater retained a greater amount of solid-associated Se. Additional wastewater experiments were conducted with supplemental carbohydrate-or glycerin-based carbon products and additional nitrogenand phosphorous-containing nutrients in some cases to enhance fungal growth. Relative to unamended wastewater experiments, supplemental carbohydrates promote Se removal from municipal wastewater but minimally impact industrial wastewater removal. This demonstrates that carbon availability and source impacts fungal Se reduction and removal from solution. Calculations to assess the leaching potential of solid-associated Se from fungal biomass show that wastewater Se release will not exceed regulatory limits. This study highlights the considerable potential for the mycoremediation of Se-contaminated wastewaters.

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Section: Introductionmentioning

confidence: 99%

Fungal Bioremediation of Selenium-Contaminated Industrial and Municipal Wastewaters

et al. 2020

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“…The band gap energy of CdSe x S y nanocrystals was found to change nonlinearly with Se/S composition (Figure c). The nonlinear trend can be ascribed to the following factors. , (i) The variation of lattice constant may change the band structure. (ii) The different electronegativities of atoms in the alloy nanocrystals deform the electronic distribution impacting the band structure.…”

Section: Resultsmentioning

confidence: 99%

One-Pot Phosphine-Free Route for Single-Component White Light Emitting CdSe_xS_y Alloy Nanocrystals

Jaiswal

Pathak

Kundu

et al. 2021

ACS Sustainable Chem. Eng.

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In an enduring quest to develop highly efficient display and lighting devices over the decades, semiconductor nanocrystals have recently emerged as favorable candidates. However, developing a prudent and viable methodology to fabricate high-quality semiconductor nanocrystals exhibiting tunable luminescence, including single-component white light emission, is challenging. Herein, we report a facile one-pot synthetic route to fabricate white light emitting CdSe x S y nanocrystals demonstrating high quantum yield using CdO, S powder, and Se powder as precursors. A phosphine-free route was adopted, employing paraffin oil as the reducing agent and solvent for the fabrication. The optical properties can be effectively tailored by controlling the reaction time and the Se/S molar ratio. The pristine CdSe x S y nanocrystals exhibited a broad visible range emission from 400 to 750 nm. The CdSe x S y nanocrystals (Se/S = 0.4) displayed white light emission with Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of (0.30, 0.31) and quantum yield of 50 ± 3%. Moreover, by manipulating the Se/S ratio effectively, the band-edge (∼400−450 nm) to trap-state (∼550−750 nm) emission was tuned, and the distinct shades of white light were obtained. The white light emission was retained in nanocrystalsembedded poly(methyl methacrylate) (PMMA) thin film and also in the hydrogel matrix. Furthermore, white light emission characteristics from CdSe x S y nanocrystals (Se/S = 0.4), PMMA thin film, and thin film coated white light emitting devices were found to be similar even after months of fabrication, indicating the high stability of the nanocrystals and sustainability of the materials derived from nanocrystals. The one-pot, low-cost fabrication route demonstrated in the present study offers the promising scope of white light emitting CdSe x S y nanocrystals in solid-state display applications.

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“…It was proposed that reducing the cliff at the interface by optimizing the buffer layer, increasing the carrier lifetime of the Se film, and alleviating optical loss could further increase the device performance [54]. Additionally, it was reported that the bandgap of Se could be tuned to a small value by alloying with tellurium (Te), thus provided a better match with the c-Si bottom cell [69]. Therefore, Se solar cells have exhibited compatibility with most bottom cells in tandem devices but still require further improvements in terms of device performance.…”

Section: Potential Candidates As Top Cell For Si-based Tandemsmentioning

confidence: 99%

Possible top cells for next-generation Si-based tandem solar cells

Chen

Tang

2020

Front. Optoelectron.

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Si-based solar cells, which have the advantages of high efficiency, low manufacturing costs, and outstanding stability, are dominant in the photovoltaic market. Currently, state-of-the-art Si-based solar cells are approaching the practical limit of efficiency. Constructing Si-based tandem solar cells is one available pathway to break the theoretical efficiency limit of single-junction silicon solar cells. Various top cells have been explored recently in the construction of Si-based tandem devices. Nevertheless, many challenges still stand in the way of extensive commercial application of Si-based tandem solar cells. Herein, we summarize the recent progress of representative Si-based tandem solar cells with different top cells, such as III-V solar cells, wide-bandgap perovskite solar cells, cadmium telluride (CdTe)-related solar cells, Cu(In,Ga)(Se,S) 2 (CIGS)-related solar cells, and amorphous silicon (a-Si) solar cells, and we analyze the main bottlenecks for their next steps of development. Subsequently, we suggest several potential candidate top cells for Si-based tandem devices, such as Sb 2 S 3 , Se, CdSe, and Cu 2 O. These materials have great potential for the development of high-performance and low-cost Si-based tandem solar cells in the future.

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Nonlinear Band Gap Tunability in Selenium–Tellurium Alloys and Its Utilization in Solar Cells

Cited by 52 publications

References 36 publications

Fungal Bioremediation of Selenium-Contaminated Industrial and Municipal Wastewaters

Fungal Bioremediation of Selenium-Contaminated Industrial and Municipal Wastewaters

One-Pot Phosphine-Free Route for Single-Component White Light Emitting CdSe_xS_y Alloy Nanocrystals

Possible top cells for next-generation Si-based tandem solar cells

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Nonlinear Band Gap Tunability in Selenium–Tellurium Alloys and Its Utilization in Solar Cells

Cited by 52 publications

References 36 publications

Fungal Bioremediation of Selenium-Contaminated Industrial and Municipal Wastewaters

Fungal Bioremediation of Selenium-Contaminated Industrial and Municipal Wastewaters

One-Pot Phosphine-Free Route for Single-Component White Light Emitting CdSexSy Alloy Nanocrystals

Possible top cells for next-generation Si-based tandem solar cells

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One-Pot Phosphine-Free Route for Single-Component White Light Emitting CdSe_xS_y Alloy Nanocrystals