interdigitated back contact

Indian PV manufacturers are looking beyond tunnel oxide passivated contact (TOPCon) solar. Back-contact (BC) devices are an enticing prospect but many feel the technology is not mature enough. Uma Gupta considers the cost, yield, and reliability challenges that BC solar has to overcome.

Researchers at the Delft University of Technology have fabricated an interdigitated back contact and heterojunction solar cell that uses a thin full-area molybdenum oxide layer as a blanket layer. The device reportedly ensures well-passivated gaps between electron and hole collecting regions.

A new generation of flexible, lightweight modules is entering the market. With back contact technology offering its own form of design flexibility and robustness, the new products could crack a hard-to-address market segment.

Clean Energy Associates (CEA) has calculated the price premium that solar developers will swallow in return for the levelized cost of energy (LCOE) savings offered by the latest generation of high-efficiency PV panels.

The search for ever higher conversion efficiency has driven solar researchers to focus on back-contact cell approaches, and efforts to devise more cost-effective manufacturing are bringing technologies such as interdigitated back contact (IBC) solar into the mainstream, as Mark Hutchins reports.

Radovan Kopecek, an expert on interdigitated back-contacted (IBC) tech, says that IBC solar panels could capture more than 50% of the global market by 2030, potentially pushing TOPCon products out of competition. He told pv magazine how this transition might materialize and discussed the tech advancements that could make it possible.

Last month, in a pv magazine Webinar held in partnership with Endurans Solar, we took a closer at Endurans’ conductive backsheet for back contact modules, and examined recent progress in back contact cell and module technologies, and their growing market potential over the next few years. Here, presenters Hugo Schoot, Business director at Endurans Solar, and Bram Verschoor, CCO at equipment supplier Eurotron, answer a more of the questions posed by the audience during the webinar.

Scientists in the United States explored the use of all back contact architectures for perovskite solar cells. The group notes several advantages to this strategy, as well as challenges to overcome. Ultimately, the work outlines a route to cell efficiencies better than 20%.

Energy commissioner Kadri Simson has opened the 38th European solar technology conference and exhibition with a positive message for the industry. A week of tech and innovation events have got under way at this year’s event, which is again being held online.

The interconnection tech, developed by scientists at the Belgian research institute Imec, is based on a three-dimensional fabric of encapsulant with incorporated horizontal and vertical solder‐coated metal ribbons. Mini solar modules built with the proposed technique have provided interesting results in tests for thermal cycling reliability, showing very limited degradation.