A synergetic effect of surface texture and field-effect passivations on improving Si solar cell performance

Qiu, Ying; Wang, Liangxing; Hao, Hong-Chen; Shi, Wei; Lu, Ming

doi:10.1016/j.physe.2015.03.025

Cited by 12 publications

(18 citation statements)

References 23 publications

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“…Because these passivation layers are insulators, thick layers can significantly increase the series resistance of solar cells. A compromise needs to be considered for field-effect passivation [242][243][244].…”

Section: Surface Passivation Of Nanostructuresmentioning

confidence: 99%

“…The overall efficiency increased from 13.27% to 15.47%. The efficiency of Si solar cells increased from 9.81% to 15.04%, which means that the relative efficiency increased by more than 50% [244]. For the structure similar to monocrystalline silicon nanowires, due to the large surface fluctuation, it was difficult to achieve full coverage of the nanostructure surface using PECVD and other means.…”

Section: Surface Passivation Of Nanostructuresmentioning

confidence: 99%

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Micro/Nanostructures for Light Trapping in Monocrystalline Silicon Solar Cells

Liu

Yin

et al. 2022

Journal of Nanomaterials

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Due to the ongoing depletion of fossil energy, alternative energy-sources and their respective conversion technologies have become very essential. An inexhaustible and clean energy form, which is already widely used, is solar energy. However, despite much progress in recent decades, due to the limitations of materials and manufacturing technology, the ability of solar cells to convert light into electrical energy is still not very high. Enhancing light absorption and reducing electric loss are the keys to improving the overall conversion efficiency of solar cells and reducing raw material costs. The former can be achieved by using micro/nanostructures and other surface features, while the latter can be realized by surface passivation. Researchers have developed different silicon-surface texturing methods to fabricate random or periodic micro/nanostructures on the surface of silicon wafers. Thanks to the special and efficient light-trapping effects of silicon micro/nanostructures, both full angle and wideband light absorption can be achieved. Different passivation methods and materials have also been widely studied, which helps to improve the surface recombination of photogenerated carriers caused by light trapping structure and significantly enhance the power conversion efficiency of Si solar cells. In this work, theoretical studies of enhanced light-trapping in micro/nanostructures are introduced. In addition, several advanced methods for preparing micro/nanostructures on the surface of monocrystalline silicon are discussed. These can be classified as top-down and bottom-up approaches. Furthermore, passivation methods for micro/nanostructures on the surface of monocrystalline silicon solar cells are reviewed, including chemical passivation and field-effect passivation. Finally, advantages and disadvantages of the micro/nanostructure preparation technologies, and light-trapping effects of the micro/nanostructures, which were fabricated using these manufacturing technologies were summarized. Moreover, the effects of different passivation technologies on the optical properties and electrical properties of these micro/nanostructures are studied. An outlook of expected and emerging research directions for monocrystalline silicon solar cells concludes this study.

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Section: Surface Passivation Of Nanostructuresmentioning

confidence: 99%

Section: Surface Passivation Of Nanostructuresmentioning

confidence: 99%

Micro/Nanostructures for Light Trapping in Monocrystalline Silicon Solar Cells

Liu

Yin

et al. 2022

Journal of Nanomaterials

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“…In the Al-BSF solar cells, the passivation of rear surface is not possible because the formation of the aluminum back surface field with aluminum paste screen-printed in the whole rear area. However, the passivation of the two surfaces of the crystalline silicon solar cells is important to achieve high efficiency because it reduces the recombination of the minority charge carriers [6,7]. To passivate the emitter or the BSF a dielectric material can be used [8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of different conductive pastes to form the contact with the boron back surface field in PERT silicon solar cells

Zanesco¹,

Crestani²,

Moehlecke³

et al. 2019

Mater. Res. Express

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The industrial production of solar cells of the PERC family is growing, because the potential to increase the efficiency due to the passivation of the rear face. The PERT solar cell is a cost-effective structure of the PERC configurations. The goal of this paper is to analyze the influence in the electrical parameters of different metal pastes used to form the contact with the boron back surface field of PERT solar cells passivated with silicon dioxide on both sides and developed with a cost-effective process. The boron doped BSF and phosphorus emitter were carried out with reduction of steps. Solar cells were processed with three different conductive pastes: (1) an aluminum paste (PV381), (2) a silver/aluminum paste (PV3N1) and (3) a silver paste (PV51G), with different viscosity and solids content. The pastes were produced by DuPont. The PV381 and PV3N1 pastes produced solar cells with the efficiency of 16.2% and 15.9%, respectively. The higher open circuit voltage was achieved with the aluminum paste, indicating that this paste is more effective to produce the selective back surface field. The PV51G paste is not suitable to form the rear contact.

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“…Nestas células solares não é possível a passivação da face posterior. No entanto, a passivação das duas superfícies das células solares de silício cristalino é importante para obter alta eficiência [4][5], pois reduz a recombinação dos portadores de carga minoritários na região.…”

Section: Introductionunclassified

Análise da passivação com SiO 2 na face posterior e frontal de células solares com campo retrodifusor seletivo

2018

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RESUMO A passivação das superfícies das células solares de silício é importante para obter alta eficiência, pois reduz a recombinação dos portadores de carga minoritários. O crescimento de SiO2 é a técnica mais efetiva para passivar lâminas de silício cristalino. O objetivo deste trabalho é apresentar o desenvolvimento e a análise da passivação na face posterior e frontal com diferentes espessuras de SiO2, crescido por oxidação seca. Células solares foram processadas com campo retrodifusor seletivo em lâminas de silício Czochralski, tipo p, grau solar. O emissor frontal foi produzido pela difusão de fósforo e o campo retrodifusor seletivo foi formado pela difusão de boro e alumínio, para possibilitar a passivação também na face posterior. Variou-se a temperatura (Toxi) e o tempo (toxi) de oxidação para formar camadas de SiO2 com diferentes espessuras. Com base em trabalhos anteriores, fixou-se toxi em 7 minutos e variou-se Toxi de 770 °C a 920 °C. A seguir, fixou-se Toxi em 800 °C e variou-se toxi de 2 a 90 minutos. As espessuras das camadas de SiO2 produzidas variaram entre 7 e 80 nm no emissor frontal e entre 1 e 14 nm na face posterior. Para avaliar a passivação, comparou-se a tensão de circuito aberto (Voc) e constatou-se que aumentou até toxi = 45 min e até Toxi = 860 °C. Com base nestes resultados, variou-se o tempo de oxidação para Toxi = 860 °C. A maior Voc, de 604 mV, foi obtida para: a) Toxi = 860 °C e toxi = 30 min e b) Toxi = 800 °C e toxi = 45 min, resultando em uma camada de SiO2 da ordem de 50 - 60 nm e de 10 - 14 nm na face dopada com fósforo e com boro, respectivamente. A maior eficiência alcançada foi de 16,0 %.

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A synergetic effect of surface texture and field-effect passivations on improving Si solar cell performance

Cited by 12 publications

References 23 publications

Micro/Nanostructures for Light Trapping in Monocrystalline Silicon Solar Cells

Micro/Nanostructures for Light Trapping in Monocrystalline Silicon Solar Cells

Analysis of different conductive pastes to form the contact with the boron back surface field in PERT silicon solar cells

Análise da passivação com SiO 2 na face posterior e frontal de células solares com campo retrodifusor seletivo

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