China-based solar module manufacturer JinkoSolar Holding has claimed that its N-type tunnel oxide passivated contact (TOPCon)-based perovskite tandem solar cell achieved a conversion efficiency of 33.84%, surpassing its previous record of 33.24%.

Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences independently tested this claim.

JinkoSolar’s new tandem cell technology utilizes the company’s N-type monocrystalline TOPCon solar cell as the bottom cell.

Tandem solar cells are stacks of multiple solar cells arranged one over the other, helping them capture more energy from the sun.

These cells are augmented by ultra-thin poly-Si passivated contact technology, a proprietary light-trapping technology, and an intermediate recombination layer with high light transmittance and carrier mobility.

The company claims that the results have broken the conversion efficiency limit of single-junction crystalline silicon cells.

The company’s perovskite/TOPCon tandem cell comprises full-area passivated contact technology, perovskite interfacial defect passivation technology, and bulk defect passivation technology to improve power generation efficiency. The tandem cells also employ surface passivation technology using hybrid materials.

Through this development, JinkoSolar aims to demonstrate TOPCon’s compatibility as a mainstream solar cell technology with next-generation perovskite/silicon tandem cells.

N-type TOPCon technology can potentially drive innovation in solar photovoltaic modules, improving performance and fulfilling diverse energy needs through consistent development.

Jinko Solar was the top module supplier to the Indian market in 1H 2024, according to Mercom’s India Solar Market Leaderboard report.

Recently, China-based solar photovoltaics company Trina Solar announced that its industrial n-type total passivation solar cell, based on heterojunction technology, achieved a front-side efficiency of 27.08 %.

In December last year, South Korea-based solar cell and module manufacturer Qcells announced achieving a 28.6% tandem solar cell efficiency on a full-area M10-sized cell that can be scaled for mass manufacturing.