In the photovoltaic industry, laser edge isolation (LEI) is a well-established process at the end of the process chain. However, because the cell properties vary from one cell producer to the next, no systematic approach is defined in industry for establishing an efficient isolation groove. Nevertheless, a general approach has to be defined for analyzing the LEI process for silicon solar cells. Besides the material aspects and laser parameters, atmospheric boundary conditions must be considered. This paper presents investigations into the ablation of a specific type of mc-silicon solar cell, and the most suitable laser, as well as the ambient parameters, is determined based on the results of the experiments.
For a vertically integrated solar cell production starting with purification of silicon feedstock and ending with the production of solar cells, it is necessary to have control over all possible parameters that may affect yield, efficiency and product quality. This paper presents an approach for tracking products with minimal effort using a contactless technique. The method allows wafers to be virtually reconstructed into bricks and ingots, as well as recognizing the precursor wafer for each solar cell.
Published in November 2011, the 14th edition of Photovoltaics International provides a variety of technical papers from some of the industry’s stalwarts. Features include: TÜV Rheinland on junction box testing; Laser Zentrum Hannover on laser edge isolation of mc-Si cells; Calisolar on the importance of traceability; Fraunhofer ISE on EWT cells; and EPIA on Europe’s LCOE.
Solar enterprises will each be faced with the occasional surplus or lack of solar modules in their lifetimes. In these instances, it is useful to adjust stock levels for modules at short notice, thus creating a spot market. Spot markets serve the short-term trade in different products, by enabling the seller to permanently or temporarily offload surplus, while buyers are able to access attractive offers on surplus stocks and supplement existing supply arrangements as a last resort.
A new production process for crystalline silicon (c-Si) solar cells, specifically p-type back-contact solar cells, is proposed. In contrast to the conventional c-Si solar cell manufacturing method, this new technology eliminates the etching process and reduces the industrial three-step electrode printing to only one step, greatly improving the technological process. Furthermore, the proposed process is also largely compatible with a traditional c-Si solar cell production line. Oxidation technology for producing the SiO2 film on a c-Si wafer, together with corrosive window technology, such as through HF corrosive paste screen printing, for creating the patterning on the wafer covered with SiO2 film, are used in the fabrication of the p-type back-contact solar cells.
In recent years solar photovoltaic electricity has shown a steady decrease in cost, thanks to technological improvements and economies of scale. Over the last 20 years the price of PV modules has dropped by more than 20% each time the cumulative volume of PV modules sold has doubled. System prices have fallen accordingly: during the last 5 years a price decrease of 50% has been seen in Europe. This trend will continue in the foreseeable future. System prices are expected to fall in the next 10 years by 36–51%, depending on the segment. Importantly, there is a huge potential for further reductions in generation costs: around 50% by 2020. The cost of PV electricity generation in Europe could decrease from 0.16–0.35€/kWh in 2010 to 0.08–0.18€/kWh in 2020, depending on system size and irradiance level. That decline in cost will continue in the coming years as the PV industry progresses towards becoming competitive with conventional energy sources. Under the right policy and market conditions, PV competitiveness can be achieved in some markets as early as 2013, and then spread across the Continent in the different market segments by 2020. This paper summarizes the first part of a newly published EPIA report about PV competing in the energy sector. The report illustrates why PV can become a mainstream player in the energy field before 2020. The study, carried out with the support of the strategic consulting firm A.T. Kearney, shines new light on the evolution of Europe’s future energy mix and PV’s role in it.
The solar industry suddenly finds itself in an altered business climate in which construction markets seem permanently damaged and government subsidies are under challenge. This paper outlines how BIPV provides a strategy for expanding the market for PV and creating value-added products in a radically changed political, economic and financial environment.
It is essential to understand the investment and operating costs of photovoltaic power plants in terms of economic parameter calculations such as levelized cost of electricity (LCoE). The dynamic behaviour of national and international markets requires a precise and detailed estimation of costs, and this knowledge is especially important to investors and policymakers. Only if the investment and operating costs of PV power plants are known can the price of electricity and the more detailed levelized cost of electricity be precisely calculated. High investment costs also require reliable investment policies and close cooperation between financial institutions (such as banks and investment funds) and power plant owners. Investment in large-scale PV power plants requires a detailed evaluation of solar radiation potential and grid availability, as well as a load analysis and a precise economic evaluation. When the investment cost based on the above-mentioned parameters is known, an estimation of the operating costs should be the next step. When all the costs of a PV power plant have been estimated, the price of electricity, or even a more detailed LCoE, can be calculated. This paper presents the trend of investment costs and some typical maintenance costs, and calculations of electricity price based on recent real data for large-scale PV power plants.
The benefits of solar photovoltaic (PV) power are well known, and, as this awareness rises and the cost of generating PV electricity declines, the technology is becoming more competitive with conventional electricity sources in market segments all across Europe. But bureaucratic hurdles remain a persistent threat to the widespread installation and integration of PV, often making it difficult to take advantage of the technology. In many countries, administrative processes and permitting procedures still require significant improvement. As a result, planning and connecting a solar photovoltaic system to the grid can still take several years in Europe.
The PV industry stands on the verge of an enormous achievement – an installed base of PV plants with 100GW of energy generation capability. This milestone has come about because of the contributions of a fully global industry that has blossomed in the past decade. Yet even though the PV industry traces its heritage to before the space programme, as with any dynamically growing industry most industry members have joined in the past five years. And each generation often makes the same mistakes that a previous generation made. Sometimes the same people move from one industry to another and repeat the same mistakes there. The PV industry is rediscovering ultra-competitive market dynamics that have previously been seen in other high-technology commodity markets. This paper begins with a discussion of one such market – the dynamic random access memory (DRAM) industry – and then looks at the current PV market and the industry outlook.
