Porous silicon: A material of choice in solar energy harvesting

Ismail, Abu Bakar Md.; Hossen, Moha Feroz; Islam, Amjad

doi:10.1109/icaees.2016.7888077

Cited by 3 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…24 Although Si semiconductor can absorb almost the entire solar spectrum, the planar Si displays strong light reflection. Therefore, it is necessary to construct the specific surface structures to enhance light absorption, such as Si microstructures (micropyramids, [28][29][30][31][32] microwires, [33][34][35] microporous Si 36,37 ) and nanostructures (nanopyramids, 38,39 nanowires, [40][41][42][43][44][45][46][47][48] nanopillars, [49][50][51] nanorods, 52,53 nanospheres, 54 etc.). Both the micro-and nano-structures can increase light harvesting via the multiple reflections and scattering.…”

Section: Enhancing Light Harvestingmentioning

confidence: 99%

“…Wet chemical/electrochemical etching technique is frequently applied to prepare microporous and micropyramidal structure of Si substrate. 28,30,32,36 Porous Si material could shorten the collection pathway of carriers and increase the active sites due to plenty of interconnected pores and large electrolyte accessible surface area. 59 Hossen et al fabricated macro-porous Si by electrochemical etching, and then deposited α-Fe 2 O 3 on it.…”

Section: Microstructuresmentioning

confidence: 99%

See 1 more Smart Citation

Strategies for improving photoelectrochemical water splitting performance of Si‐based electrodes

Cheng

Zhang

Chen

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

Si, as a narrow bandgap semiconductor with a broadband absorption for sunlight, is considered to be a very competitive photoelectrode material for solar-driven photoelectrochemical (PEC) water splitting. However, there are major barriers in construction of efficient and stable Si-based PEC cell, including low photovoltage, sluggish reaction kinetics, and poor stability in electrolytes. This review focuses on the strategies to solve these issues and summarizes recent progress. The working principles of PEC water splitting are first introduced. Then the strategies for improving Si-based photoelectrode performances are discussed, including (1) the regulation of Si surface morphology for enhancing light harvesting, (2) band structure engineering strategies to reduce recombination of photogenerated carriers, and (3) modification of protection layers for long stability and loading cocatalysts on Si-based photoelectrodes for accelerating water splitting. Lastly, we have presented some issues of Si-based photoelectrode materials, which should be addressed in future research.

show abstract

Section: Enhancing Light Harvestingmentioning

confidence: 99%

Section: Microstructuresmentioning

confidence: 99%

Strategies for improving photoelectrochemical water splitting performance of Si‐based electrodes

Cheng

Zhang

Chen

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

Investigation on Fe2O3/por-Si photocatalyst for low-bias water-splitting

Hossen

Ismail

2018

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

The interplay of chemical structure, physical properties, and structural design as a tool to modulate the properties of melanins within mesopores

Pira

Amatucci

Melis

et al. 2022

Sci Rep

View full text Add to dashboard Cite

The design of modern devices that can fulfil the requirements for sustainability and renewable energy applications calls for both new materials and a better understanding of the mixing of existing materials. Among those, surely organic–inorganic hybrids are gaining increasing attention due to the wide possibility to tailor their properties by accurate structural design and materials choice. In this work, we’ll describe the tight interplay between porous Si and two melanic polymers permeating the pores. Melanins are a class of biopolymers, known to cause pigmentation in many living species, that shows very interesting potential applications in a wide variety of fields. Given the complexity of the polymerization process beyond the formation and structure, the full understanding of the melanins' properties remains a challenging task. In this study, the use of a melanin/porous Si hybrid as a tool to characterize the polymer’s properties within mesopores gives new insights into the conduction mechanisms of melanins. We demonstrate the dramatic effect induced on these mechanisms in a confined environment by the presence of a thick interface. In previous studies, we already showed that the interactions at the interface between porous Si and eumelanin play a key role in determining the final properties of composite materials. Here, thanks to a careful monitoring of the photoconductivity properties of porous Si filled with melanins obtained by ammonia-induced solid-state polymerization (AISSP) of 5,6-dihydroxyindole (DHI) or 1,8-dihydroxynaphthalene (DHN), we investigate the effect of wet, dry, and vacuum cycles of storage from the freshly prepared samples to months-old samples. A computational study on the mobility of water molecules within a melanin polymer is also presented to complete the understanding of the experimental data. Our results demonstrate that: (a) the hydration-dependent behavior of melanins is recovered in large pores (≈ 60 nm diameter) while is almost absent in thinner pores (≈ 20 nm diameter); (b) DHN-melanin materials can generate higher photocurrents and proved to be stable for several weeks and more sensitive to the wet/dry variations.

show abstract

Porous silicon: A material of choice in solar energy harvesting

Cited by 3 publications

References 13 publications

Strategies for improving photoelectrochemical water splitting performance of Si‐based electrodes

Strategies for improving photoelectrochemical water splitting performance of Si‐based electrodes

Investigation on Fe2O3/por-Si photocatalyst for low-bias water-splitting

The interplay of chemical structure, physical properties, and structural design as a tool to modulate the properties of melanins within mesopores

Contact Info

Product

Resources

About