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Photovoltaics International Volume 44

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Trying to fathom the impact COVID-19 will have on the PV industry is almost impossible currently. However, what is clear is that technological advancements and innovations continue at an unprecedented pace, whether evolving efficiency gains in mainstream PERC cell technology to next-generation developments with n-type architectures, through to tandem junction and multi-junction alternatives.

This is being supported by an avalanche of new manufacturing capacity expansion announcements that are expected to see large, multiple gigawatts of TOPCon and heterojunction facilities ramp in the next few years with the intention of significantly lowering production costs, while boosting conversion efficiencies. All these developments are centre stage in this edition.

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In this issue...

Photovoltaics International Archive
Cell Processing, Photovoltaics International Papers
Silicon heterojunction (SHJ) solar cell technology is an attractive technology for large-scale production of solar cells with a high conversion efficiency beyond 24%. One key element of SHJ solar cells, contrasting with today’s widespread passivated emitter and rear contact (PERC) cell technology, is the use of transparent conductive oxide (TCO), which poses challenges in performance and costs but also presents opportunities. This paper discusses these aspects and shows the potential for improving cell efficiency at reduced cost by using new TCOs deposited by direct current (DC) sputtering.
Photovoltaics International Archive
Cell Processing, Photovoltaics International Papers
In this paper the situation of solar cell production in China is summarized, and an attempt is made to answer the question of whether passivated contacts could replace PERC technology, which will eventually reach its efficiency limit in the future.
Photovoltaics International Archive
Cell Processing, Photovoltaics International Papers
Passivated-contact solar cell designs, such as TOPCon or silicon heterojunction solar cells (SHJs), enable cell efficiencies greater than 24%, and are promising candidates for the next revolution in mass production after the passivated emitter and rear cell (PERC). Plated metallization (Ni/Cu/Ag or Cu/Ag) fits well with new constraints on low-temperature processing and the combination of low material costs and highly conductive bifacial metal grids for these types of solar cell.
Photovoltaics International Archive
Cell Processing, Photovoltaics International Papers
For the work reported in this paper, a new model of the screen-printing process was set up in order to improve the understanding of the screenprinting process, with a focus on the interaction between Ag paste and the screen.
Photovoltaics International Archive
Photovoltaics International Papers, PV Modules
Different types of PV backsheet provide modules with varying levels of protection in warm, humid conditions. Haidan Gong, Minge Gao and Yiwei of Wuxi Suntech’s PV test centre detail the results of research undertaken to better understand the properties of different backsheet materials in tropical conditions.
Photovoltaics International Archive
Photovoltaics International Papers, PV Modules
Half-cell modules are gaining an increasing market share because of their potential for increasing module power without requiring any changes to cell technology. However, it has emerged that different cell separation technologies can produce similar electrical performances of the half cells, yet lead to an entirely different mechanical behaviour of the cells.
Photovoltaics International Archive
Photovoltaics International Papers, PV Modules
The market share of bifacial solar modules is rising, because of the additional power yields of up to 20% per year, which reduce the levelized cost of electricity (LCOE). Many manufacturers have bifacial PV modules in their portfolios, with a majority of them employing bifacial passivated emitter and rear cell (PERC+) technology. In this paper, it is shown from the results of studies that rear-side-related potential-induced degradation (PID) effects can occur in addition to the conventional front-side shunting type (PID-s).
Photovoltaics International Archive
Photovoltaics International Papers, PV Modules
The recent trends in crystalline Si-based bifacial cell development are having a major impact on interconnection technology. This paper presents an overview of various bifacial interconnection technologies.
Photovoltaics International Archive
Fab & Facilities, Photovoltaics International Papers
This paper outlines how a blend of physics-based analysis and statistical data science methods can aid continuous improvement and yield optimization in high-volume solar cell fabrication.
Photovoltaics International Archive
Fab & Facilities, Photovoltaics International Papers
PV manufacturing capacity expansion announcements in 2019 were a stark contrast to 2018, when major policy changes in China impacted the upstream supply chain. This paper looks in detail at not only a significant recovery in capacity expansions throughout the year but also new trends in the capacity scale of announcements and a marked shift in wafer sizes and cell technology.

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