Double-sided pyramid texturing design to reduce the light escape of ultrathin crystalline silicon solar cells

Guan, Li; Shen, Guangming; Liang, Yongye; Tan, Fengxue; Xu, Xiaofang; Tan, Xinyu; Li, Xu

doi:10.1016/j.optlastec.2019.105700

Cited by 7 publications

(5 citation statements)

References 38 publications

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“…For J sc (Figure 2A), the textured wafers provide much higher J sc due to a more efficient absorption of the AM 1.5G spectrum in infrared region. 40 The highest J sc value is obtained for the thinnest SiO x 1c at 39.24 mA/cm 2 and decreases for thicker SiO x layer on textured surfaces. For polished h100i and h111i wafers, the best J sc is measured at 34.25 mA/cm 2 and 34.32 mA/cm 2 with SiO x 2c, respectively, and also decreases with thicker SiO x layer.…”

Section: Solar Cells Performancesmentioning

confidence: 87%

Role of silicon surface, polished 〈100〉 and 〈111〉 or textured, on the efficiency of double‐sided TOPCon solar cells

Lozac’h

Nunomura

2020

Progress in Photovoltaics

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We investigate the role of the silicon surface and orientation on double‐sided TOPCon solar cells properties. The solar cells of front and rear, (p) and (n), poly‐Si/SiOx stack, fabricated on polished surfaces oriented 〈100〉 and 〈111〉 and pyramid textured surfaces, are characterized as a function of the thickness of an ultrathin SiOx layer, controlled at atomic scale from one‐ to four‐cycle atomic layer deposition (ALD). Our findings underline that the optimized thickness of the ultrathin SiOx is about 1.1 ± 0.1 nm, corresponding to a two‐cycle ALD, regardless of the surface and orientation of the c‐Si substrate. The open‐circuit voltage is about 10 mV higher on the polished 〈100〉‐oriented surface, associated with lower defect density at the interface of SiOx/c‐Si. On the other hand, the contact resistance is much lower, about 0.45 Ω/cm2, on the polished 〈111〉‐oriented surface. On textured surfaces, we demonstrate a photoconversion efficiency of 19.1% for the double‐sided TOPCon structure strictly for a SiOx thickness with two‐cycle ALD, which underlines the importance of the ALD technique for the precise control of the ultrathin SiOx thickness on textured surface.

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Section: Solar Cells Performancesmentioning

confidence: 87%

Role of silicon surface, polished 〈100〉 and 〈111〉 or textured, on the efficiency of double‐sided TOPCon solar cells

Lozac’h

Nunomura

2020

Progress in Photovoltaics

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“…Dispersion relation for light in vacuum (blue) and in a homogenous and isotropic medium (red). The blue and red circle depict the two-dimensional LDOS for vacuum and medium with refractive index n, both at the same energy discussed in literature both in experimental 53,57,61,62 and in computational 52,54,55,[63][64][65][66] This shows that for optimal light management, not only light trapping but also avoiding reflection and parasitic absorption is crucial. 27,68 If the thickness of the silicon absorber is reduced to only a few micrometers and is therefore similar to the pyramid size, (random) pyramids are no longer viable as Lambertian reflectors.…”

Section: Pyramidsmentioning

confidence: 70%

“…The rear texture randomizes the light even further. 53 A combination of random front and rear texture has shown to provide close to ideal Lambertian properties. 50,54,55 A variety of different designs have been proposed based on the pyramid principle.…”

Section: Pyramidsmentioning

confidence: 99%

Light trapping in thin silicon solar cells: A review on fundamentals and technologies

Saive

2021

Progress in Photovoltaics

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Thin, flexible, and efficient silicon solar cells would revolutionize the photovoltaic market and open up new opportunities for PV integration. However, as an indirect semiconductor, silicon exhibits weak absorption for infrared photons and the efficient absorption of the full above bandgap solar spectrum requires careful photon management. This review paper provides an overview on the fundamental physics of light trapping and explains known theoretical limits. Technologies that have been developed to improve light trapping will be discussed, and limitations will be addressed.

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“…Guan et al designed and simulated an ultrathin crystalline silicon solar cells with front and double-sided pyramids. By optimizing the pyramid shape, the maximum photocurrent density of front pyramids and double-sided pyramids is found to be 36.23 mA/cm 2 and 37.71 mA/cm 2 , respectively [386]. The double-sided pyramidal structures not only suppresses the reflection, but also improves the optical absorption at long wavelength range that made the absorption to reach the Yablonovitch limit.…”

Section: Potential Light Trapping Structuresmentioning

confidence: 98%

Anti-Reflective Coating Materials: A Holistic Review from PV Perspective

Natarajan

Pugazhendhi

Elavarasan³

et al. 2020

Energies

148

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The solar photovoltaic (PV) cell is a prominent energy harvesting device that reduces the strain in the conventional energy generation approach and endorses the prospectiveness of renewable energy. Thus, the exploration in this ever-green field is worth the effort. From the power conversion efficiency standpoint of view, PVs are consistently improving, and when analyzing the potential areas that can be advanced, more and more exciting challenges are encountered. One such crucial challenge is to increase the photon availability for PV conversion. This challenge is solved using two ways. First, by suppressing the reflection at the interface of the solar cell, and the other way is to enhance the optical pathlength inside the cell for adequate absorption of the photons. Our review addresses this challenge by emphasizing the various strategies that aid in trapping the light in the solar cells. These strategies include the usage of antireflection coatings (ARCs) and light-trapping structures. The primary focus of this study is to review the ARCs from a PV application perspective based on various materials, and it highlights the development of ARCs from more than the past three decades covering the structure, fabrication techniques, optical performance, features, and research potential of ARCs reported. More importantly, various ARCs researched with different classes of PV cells, and their impact on its efficiency is given a special attention. To enhance the optical pathlength, and thus the absorption in solar PV devices, an insight about the advanced light-trapping techniques that deals with the concept of plasmonics, spectral modification, and other prevailing innovative light-trapping structures approaching the Yablonovitch limit is discussed. An extensive collection of information is presented as tables under each core review section. Further, we take a step forward to brief the effects of ageing on ARCs and their influence on the device performance. Finally, we summarize the review of ARCs on the basis of structures, materials, optical performance, multifunctionality, stability, and cost-effectiveness along with a master table comparing the selected high-performance ARCs with perfect AR coatings. Also, from the discussed significant challenges faced by ARCs and future outlook; this work directs the researchers to identify the area of expertise where further research analysis is needed in near future.

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Double-sided pyramid texturing design to reduce the light escape of ultrathin crystalline silicon solar cells

Cited by 7 publications

References 38 publications

Role of silicon surface, polished 〈100〉 and 〈111〉 or textured, on the efficiency of double‐sided TOPCon solar cells

Role of silicon surface, polished 〈100〉 and 〈111〉 or textured, on the efficiency of double‐sided TOPCon solar cells

Light trapping in thin silicon solar cells: A review on fundamentals and technologies

Anti-Reflective Coating Materials: A Holistic Review from PV Perspective

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