Heterojunction know-how (HJT) is a not-so-new photovoltaic panel manufacturing technique that has actually picked up steam within the final decade. The expertise is at present the photovoltaic trade’s best choice to extend effectivity and energy output to their highest ranges. HJT combines one of the best qualities of crystalline silicon with these from amorphous silicon skinny–movie to supply an excessive–energy hybrid cell that surpasses the efficiency of the business’s go-to expertise, PERC.
HJT’s newest headline seize got here in Could when REC Group introduced the business’s strongest 60-cell photovoltaic panel at 380 W, a feat made attainable by HJT processes perfected by gear producer Meyer Burger, an HJT market chief since 2010. As the one tools provider providing a turnkey HJT manufacturing course of, Meyer Burger is establishing a motion — the corporate equipped gear to EkoRE’s beneath–development 1-GW HJT line in Turkey in addition to SolarTech Common’s line of HJT panels produced in Florida, and an unnamed North American photovoltaic cell startup plans to make use of Meyer Burger’s HJT expertise because it ramps up.
Different giant Asian names are going all-in on HJT on their very own. Jerry was one of many first corporations to commercialize HJT modules in China and introduced in March 2019 that it has reached 23.79% effectivity on its HJT cells, and its 72-cell JNHM72 module reached 452.5 W. Risen Power broke floor on a 2.5-GW HJT cell and module manufacturing plant in China in August 2019 that must be accomplished in 2021.
The 2019 “Worldwide Know-how Roadmap for Photovoltaic” report expects HJT cells to realize a market share of 12% in 2026 and 15% by 2029 — a gentle rise for expertise that only a decade in the past was solely utilized by Panasonic.
The HJT manufacturing idea was developed by SANYO Electrical within the Nineteen Eighties (SANYO was acquired by Panasonic in 2009). SANYO was the primary firm to commercially produce photovoltaic cells fabricated from amorphous silicon (a-Si). This skinny–movie know-how, mostly present in pocket calculators, absorbs a variety of the sunshine spectrum however has a low conversion effectivity (the best effectivity on a document for a-Si is 13.6%). So, SANYO performed with a-Si cells, finally laminating them with crystalline silicon wafers and a clear conducting oxide (TCO) layer. The c-Si part introduced elevated effectivity stability whereas the a-Si facet included the elevated gentle absorption. Heterojunction know-how was born.