Silicon wafers for industrial n-type SHJ solar cells: Bulk quality requirements, large-scale availability and guidelines for future developments

“…[ 7,26 ] Yet, studies on mass production of SHJ cells have found that FF and efficiency benefit from lower bulk resistivities when using commercial wafers in the range of 0.3–2.1 Ωcm. [ 7,27 ] According with these studies, solar cells with lower bulk resistivities are more resilient to lower bulk lifetimes and process‐induced defects.…”

Section: Resultsmentioning

confidence: 99%

“…[ 1,6 ] Under STC conditions, the effective bulk resistivity of a solar cell with excellent surface passivation and high bulk lifetime is driven less by the bulk doping than by the excess carrier concentration. [ 7,26 ] Instead, at lower illumination intensities, the generation of excess carriers decreases, and the bulk doping can limit the performance of the solar cell. In Figure we compare the output power density of SHJ solar cells manufactured with medium (3 Ωcm), high (75 Ωcm), and very‐high (>15 000 Ωcm) bulk resistivities for illumination intensities between 0.1 and 1 suns.…”

Section: Resultsmentioning

confidence: 99%

“…As previously discussed, at 1‐sun, the effective bulk resistivity of the cell is mainly determined by the excess carrier concentration, thus it is unlikely that the FF differences at 1 sun are due to the bulk doping. [ 7,26 ] Yet, studies on mass production of SHJ cells have found that FF and efficiency benefit from lower bulk resistivities when using commercial wafers in the range of 0.3–2.1 Ωcm. [ 7,27 ] According with these studies, solar cells with lower bulk resistivities are more resilient to lower bulk lifetimes and process‐induced defects.…”

Section: Resultsmentioning

confidence: 99%

“…[ 5,6 ] Typical bulk resistivities for commercial solar cells today are between 0.3 and 3 Ωcm. [ 7 ] Commercial‐size solar cells with efficiencies over 25% were only attained on interdigitated back contact (IBC) and silicon heterojunction (SHJ) solar cells that often use higher bulk resistivities. [ 8–11 ] By combining these two architectures, Kaneka accomplished record efficiencies over 26% on large area solar cells using 7 Ωcm n‐type wafers.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Bulk Resistivity on Silicon Heterojunction Solar Cells and Module Reliability

2022

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Recent developments in industry on surface passivation open the possibility of using less doped substrates in silicon solar cells. We investigate how the bulk resistivity affects the performance of silicon cells and the reliability of modules. Herein, n‐ and p‐type silicon heterojunction cells with bulk resistivities between 3 and 15 000 Ωcm are studied. We measure the current–voltage characteristics of n‐type cells across the resistivity range, and we find comparable responses to illumination intensities between 0.1 and 1 suns. The cells with bulk resistivities over 1000 Ωcm show breakdown voltages larger than −1000 V, almost two orders of magnitude higher than in typical commercial cells. Although modules have bypass‐diodes to prevent cells from going into breakdown, higher breakdown voltages can improve the reliability of modules in case of bypass‐diode failure and reduce the module cost by easing the number of bypass‐diodes required. Finally, the cells have been submitted to light soaking. The float‐zone p‐type cells with bulk resistivities over 10 000 Ωcm are less sensitive to light‐induced degradation than cells with bulk resistivities below 10 Ωcm. The former show to recover few hours after light soaking, while the latter recover only after dark annealing.

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Stable Organic Passivated Carbon Nanotube–Silicon Solar Cells with an Efficiency of 22%

Yan

Zhang

et al. 2021

Advanced Science

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The organic passivated carbon nanotube (CNT)/silicon (Si) solar cell is a new type of low-cost, high-efficiency solar cell, with challenges concerning the stability of the organic layer used for passivation. In this work, the stability of the organic layer is studied with respect to the internal and external (humidity) water content and additionally long-term stability for low moisture environments. It is found that the organic passivated CNT/Si complex interface is not stable, despite both the organic passivation layer and CNTs being stable on their own and is due to the CNTs providing an additional path for water molecules to the interface. With the use of a simple encapsulation, a record power conversion efficiency of 22% is achieved and a stable photovoltaic performance is demonstrated. This work provides a new direction for the development of high-performance/low-cost photovoltaics in the future and will stimulate the use of nanotubes materials for solar cells applications.

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Silicon wafers for industrial n-type SHJ solar cells: Bulk quality requirements, large-scale availability and guidelines for future developments

Cited by 17 publications

References 21 publications

Influence of cell edges on the performance of silicon heterojunction solar cells

Influence of cell edges on the performance of silicon heterojunction solar cells

Influence of the Bulk Resistivity on Silicon Heterojunction Solar Cells and Module Reliability

Stable Organic Passivated Carbon Nanotube–Silicon Solar Cells with an Efficiency of 22%

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