Heterojunction back contact solar cell reaches 27.09% efficiency in tests

A group of engineers at China’s LONGi Central R&D Institute, working with colleagues from Shenzhen Campus of Solar Yat-sen College, reviews that its heterojunction again contact (HBC) photo voltaic cell has achieved efficiencies as excessive as 27.09% throughout testing.

Of their paper published within the journal Nature Communicationsthe group describes a number of strategies they developed to enhance the effectivity of the photo voltaic cell and the way it was constructed.

HBCs are a photo voltaic cell design kind that includes placing the principle working construction on the rear of the cell to permit extra sunshine to strike the cell, thus bettering effectivity over extra customary designs.

Sadly, the design has been stymied by difficulties in managing the mandatory cost service recombination. On this new effort, the researchers in China declare that they’ve overcome these difficulties to create a extremely environment friendly photo voltaic cell.

LONGi introduced the development of their new extremely environment friendly HBC photo voltaic cell final December, however didn’t give many particulars—they stated little greater than that their work was groundbreaking and had been achieved utilizing a newly developed laser instrument. Of their new paper, the group backs up their claims by noting that its effectivity has been verified independently by the Institute for Photo voltaic Vitality Analysis Hamelin.

The analysis group made their cell by utilizing a n-type monocrystalline silicon wafer. On the entrance, they utilized an antireflecting coating. On the again, they divided the working space into 4 sections: a spot area, a hold-selection contact, an HSC plus hole and an electron-selective contact.

In addition they used a laser to ablate the stack—the clear conductive oxide (TCO) layer was laid utilizing magnetron sputtering. The group used one other laser to ablate the hole, which prevents leaking. A closing silicon nitride layer was added to forestall injury to the opposite layers whereas the cell was in operation.

The researchers examined the cell beneath what they describe as customary circumstances, during which their cell achieved 27.09% effectivity. In addition they notice that they plan to proceed work on their cell, hoping to enhance effectivity even additional—they recommend that making a couple of adjustments ought to bump it to 27.7%.

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