Low Reflection and Low Surface Recombination Rate Nano-Needle Texture Formed by Two-Step Etching for Solar Cells

Hsu, Chia-Hsun; Liu, Shih-Mao; Lien, Shui−Yang; Zhang, Xiaoying; Cho, Yun-Shao; Huang, Yanhua; Zhang, Sam; Chen, Songyan; Zhu, Wen‐Zhang

doi:10.3390/nano9101392

Cited by 9 publications

(8 citation statements)

References 36 publications

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“…In the previous study, the J–V characteristics were performed under different passivation value without taking into account the lifetime degradation. On the other hand, the processes of the MACE leads to dislocations and dangling bonds resulting in a severe SRH recombination 79 . It was reported that the carrier lifetime strongly depends on the injection level and the MACE etching time 79 .…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the processes of the MACE leads to dislocations and dangling bonds resulting in a severe SRH recombination 79 . It was reported that the carrier lifetime strongly depends on the injection level and the MACE etching time 79 . Further, the carrier lifetime decreases by increasing the frontal surface area in practical 79 .…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that the carrier lifetime strongly depends on the injection level and the MACE etching time 79 . Further, the carrier lifetime decreases by increasing the frontal surface area in practical 79 . To investigate how the surface defects affects the reported NWs structures, the lifetime degradation (LTD) is taken into account.…”

Section: Resultsmentioning

confidence: 99%

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Electrical performance of efficient quad-crescent-shaped Si nanowire solar cell

El-Bashar

Hussein

Hegazy

et al. 2022

Sci Rep

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The electrical characteristics of quad-crescent-shaped silicon nanowire (NW) solar cells (SCs) are numerically analyzed and as a result their performance optimized. The structure discussed consists of four crescents, forming a cavity that permits multiple light scattering with high trapping between the NWs. Additionally, new modes strongly coupled to the incident light are generated along the NWs. As a result, the optical absorption has been increased over a large portion of light wavelengths and hence the power conversion efficiency (PCE) has been improved. The electron–hole (e–h) generation rate in the design reported has been calculated using the 3D finite difference time domain method. Further, the electrical performance of the SC reported has been investigated through the finite element method, using the Lumerical charge software package. In this investigation, the axial and core–shell junctions were analyzed looking at the reported crescent and, as well, conventional NW designs. Additionally, the doping concentration and NW-junction position were studied in this design proposed, as well as the carrier-recombination-and-lifetime effects. This study has revealed that the high back surface field layer used improves the conversion efficiency by $$\sim$$ ∼ 80%. Moreover, conserving the NW radial shell as a low thickness layer can efficiently reduce the NW sidewall recombination effect. The PCE and short circuit current were determined to be equal to 18.5% and 33.8 mA$$/\hbox {cm}^2$$ / cm 2 for the axial junction proposed. However, the core–shell junction shows figures of 19% and 34.9 mA$$/\hbox {cm}^2$$ / cm 2 . The suggested crescent design offers an enhancement of 23% compared to the conventional NW, for both junctions. For a practical surface recombination velocity of $$10^{2}$$ 10 2 cm/s, the PCE of the proposed design, in the axial junction, has been reduced to 16.6%, with a reduction of 11%. However, the core–shell junction achieves PCE of 18.7%, with a slight reduction of 1.6%. Therefore, the optoelectronic performance of the core–shell junction was marginally affected by the NW surface recombination, compared to the axial junction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Electrical performance of efficient quad-crescent-shaped Si nanowire solar cell

El-Bashar

Hussein

Hegazy

et al. 2022

Sci Rep

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“…For safeguarding optical instruments present on the satellites and to suppress stray light, various types of black coatings are developed in past few years . Most of these black surfaces are fabricated using surface texturing, optical grating, etching, nano composite or by applying coating of different nanomaterials on the surface of interest. It is observed that the surface texturing/etching followed by nano‐coating shows enhanced light trapping capacity in a broader wavelength range.…”

Section: Introductionmentioning

confidence: 99%

Near perfect thin film flexible broadband optical absorber with high thermal/electrical conductivity

Ghai

Singh

Agnihotri

2019

J of Applied Polymer Sci

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Flexible ultra-black absorber with high thermal/electrical conductivity finds huge applications in the field of stray light attenuation, solar collectors, flexible electronics, and electronic thermal management systems. In this work, we report the fabrication of ultrablack absorber consists of vertically aligned carbon nanotubes (VACNT) in Polydimethylsiloxane (PDMS) having an absorption capacity of more than 98% in UV-Vis wavelength and more than 94% in NIR wavelength range. It is observed that the PDMS-VACNT composite shows ultra-high absorption capacity due to enhanced impedance matching and multiple scattering. In addition to this, the PDMS-VACNT composite shows an emissivity of 0.94 along with a 118% increase in thermal conductivity. Moreover, with the infiltration of VACNT in PDMS, the sheet resistance decrease drastically to 0.08 KΩ/sq, which signify the possible use of ultrablack absorber in electronic skin and flexible sensors etc.

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“…It indicates the advantages of superior light-trapping ability and structure characteristics for the new fabrication process to create b-Si solar cells. Naturally, the hybrid (joint) use of b-Si and pyramidal textured surfaces can get a more tangible effect [8].…”

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confidence: 99%

Fabricating and Testing Black Silicon Solar Cells

Ayvazyan

Aghabekyan

2021

Information Technologies, Electronics, Radio Engineering

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Black Si (b-Si) is a needle-like surface of crystalline Si. The optical radiation incident on it is almost completely absorbed due to multi-reflections from the side surfaces of the needles, which makes b-Si attractive for solar cell applications as antireflection surfaces. Currently, b-Si solar cells are fabricated based on the sequences used for traditional (pyramidal textured) solar cells, namely first, an antireflection surface is formed, and then high-temperature treatments such as oxidation and diffusion are carried out. However, in this case, due to large surface area, the diffusion of dopants within b-Si is much more efficient than in a planar, without texture, wafer. It leads to high doping concentrations and non-uniformity in the dopant. In addition, during the diffusion process, a surface layer of glass is grown, and subsequently removed by wet etching, which leads to noticeable changes in the morphology and structure of b-Si. As a result, after thermal and chemical treatments, the optical characteristics of the b-Si are retrogressed. A new fabrication sequence of b-Si solar cells has been proposed and tested, according to which, the b-Si with preferable height of needles is formed after the main chemical and thermal treatments of the technological process. It has been shown that all performance parameters (open-circuit voltage, short current, fill factor and conversion efficiency) of the new b-Si solar cells are higher than those of the conventional solar cells. Joint use of b-Si and pyramidal textured surfaces can get a more tangible effect.

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Low Reflection and Low Surface Recombination Rate Nano-Needle Texture Formed by Two-Step Etching for Solar Cells

Cited by 9 publications

References 36 publications

Electrical performance of efficient quad-crescent-shaped Si nanowire solar cell

Electrical performance of efficient quad-crescent-shaped Si nanowire solar cell

Near perfect thin film flexible broadband optical absorber with high thermal/electrical conductivity

Fabricating and Testing Black Silicon Solar Cells

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