PV roadmap: A clear picture of tomorrow’s winning PV technologies

LYON, FRANCE: Making photovoltaics a low-cost source of clean and renewable energy is the main goal for most developed countries. Many of them have agreed on a 20 percent renewable energy target by 2020, and some already started to implement aggressive feed-in-tariffs to finance this objective.

But the question is how do we get there from what has been achieved so far? What would happen if governments partially stop financing the PV industry through incentive program cuts as in Germany for instance? Can today’s technolo-gies be competitive without the incentives or do we need technical evolutions, or even technical breakthroughs to get there?

Photovoltaic Technology RoadmapSource: Yole Développement, France.

Yole Développement has released its latest photovoltaic research study, named Photovoltaic Technology Roadmap, which presents and analyses the latest tech-nology trends in crystalline and thin-film solar cells.

The results were obtained as a result of a meticulous data collection process over more than 80 companies and R&D labs.

There is no doubt that the government incentive programs helped industrial to achieve, step by step, drastic cost reduction and performance improvements in a very short period of time but without real revolutions.

The photovoltaic (PV) industry has also seen the emergence of large scale production facili-ties, international R&D centres, and innovative equipment makers thus resulting in the im-pressive cost reduction Yole Développement knows. But if large production facilities can play the scale effect card to lower the cost of raw material and increase their yield, many other levers exist in order to reduce the production cost.

“In this PV Technology roadmap report, we describes all the different aspects linked to pro-duction cost reduction," explains Arnaud Duteil, Market & Technology Analyst at Yole Déve-loppement: from cell structure innovations to modification of manufacturing processes.

The microtech market research company describes all the existing technologies: From those developed by the University of New South Wales (UNS W), to the metal wrap through (MWT) concept developed by the ECN and industrialized with Solland, to the new emitter wrap through (EWT) technology being developed by Bosh Solar.

Conventional crystalline silicon cells could bump up against their theoretical maximum efficiency of 29 percent as soon as 2020. Sanyo Electric Co. Ltd, for instance, demonstrated ~23 percent efficiency with a 10cm² R&D unit of its heterojunction with intrinsic thin layer (HIT) cells last year.

It figures that thinner surface contacts, better transparent conductors, and lower defect density can improve performance by several more percentage points, to likely get commercial efficiency up to about as close as practical to the theoretical limit within about a decade.