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Lead-free perovskite solar cell achieves 24.1% efficiency – pv magazine International


Researchers in Singapore have developed a perovskite photo voltaic cell by a brand new technique of synthesizing the capping with out utilizing lead. The cell is coated with a zinc-based compound and is reported to have a conversion effectivity of 24.1%.

Scientists from Nanyang Technological College (NTU) and Singapore’s Company for Science, Expertise and Analysis (A*STAR) have developed a brand new option to synthesize the capping layer of perovskite photo voltaic cells with out utilizing lead.

“This paves the best way for the event of eco-friendly perovskite photo voltaic cells which is one step nearer to the buyer market,” an NTU spokesperson mentioned. pv journal. “The findings open new alternatives for the event of higher supplies for the capping layer, for extra environment friendly and steady perovskite photo voltaic cells.”

The capping layer of perovskite cells is normally made utilizing the half precursor (HP) technique, the place a chemical precursor is positioned on high of the perovskite layer. The precursor reacts with the lead ions current within the perovskite layer and kinds a lead-based chemical compound that makes up the capping layer.

To make perovskite photo voltaic cells extra environmentally pleasant, NTU scientists have developed a brand new technique often called full precursor (FP) resolution. They coated the perovskites with options containing steel halide salts and phenethylammonium iodide (PEAI).

“PEAI accommodates ammonium, a positively charged ion with nitrogen and hydrogen, which is crucial for chemical reactions,” NTU defined in an announcement.

The staff synthesized a zinc-based compound often called PEA2ZnX4 utilizing the FP technique and located it to be the simplest capping materials among the many different supplies examined. They created a prototype photo voltaic cell coated with a zinc-based compound.

Layers of perovskite photo voltaic cells with zinc-based capping materials

Picture: NTU

“In contrast to the HP technique, it isn’t essential to extract lead ions from the underlying perovskite layer to kind this protecting capping layer when utilizing the FP technique. This paves the best way for the usage of non-toxic metals within the capping layer, ”mentioned the scientists.

The perovskite cell is reported to have a conversion effectivity of 24.1% beneath lab settings. The prototype confirmed a mean mild conversion fee of round 23% within the 103 cells examined. It maintains greater than 90% of its skill to transform mild into electrical energy for greater than 1,000 hours of operation at full capability.

Scientists are engaged on scaling the strategy to supply full-size photo voltaic cells. They’re additionally within the technique of submitting a patent with NTUitive, NTU Singapore’s innovation and enterprise firm.

They share their findings in “Increasing the low-dimensional interface engineering toolbox for environment friendly perovskite photo voltaic cells,” just lately printed in Pure Vitality.

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