星期五, 6月 25, 2021
Home PV Technology Methylammonium-free perovskite solar cell with slot-die coating, 18% efficiency

Methylammonium-free perovskite solar cell with slot-die coating, 18% efficiency

Researchers have developed a slot-die coated solar cell with an ‘n-i-p’ layout and a fluorine-doped tin oxide substrate, a tin oxide layer, a perovskite film, and a hole-blocking layer. It has an efficiency of 18.03%, an open-circuit voltage of 1024 mV, and a short-circuit current density of 22.4 mA cm−2.

Source:pv magazine

Scientists from Nanyang Technological University in Singapore and Université Grenoble Alpes in France have combined a slot-die coating technique with gas quenching and substrate heating to fabricate a perovskite solar cell with an active area of over 0.09 cm2 and a power conversion efficiency of 18%.

Gas quenching is used primarily in connection with hardening in vacuum furnaces and slot-die coating is a process already used in various industries. Ink is pushed through a narrow slot as it moves across a substrate to form a continuous film. Substrate heating is commonly applied in the pulsed laser deposition (PLD) process.

These techniques, which the researchers described as a combined “synergistic crystallization strategy,” was used to coat a methylammonium-free perovskite film with a thickness of around 500 nm over a fluorine-doped tin oxide (FTO) substrate of 10 × 10 cm2 without the use of solvents or additives.

The perovskite precursor ink was prepared in a nitrogen-filled glovebox by mixing lead(II) iodide (PbI2), formamidinium iodide (FAI), lead(II) bromide (PbBr2), and cesium iodide (CsI).

“The solution was kept at 40 C under stirring overnight and transferred to the slot-die tubing system the next day,” the scientists said. “For the perovskite module fabrication, P2 scribing was performed with a CO2 laser with adjusted power to remove specifically the perovskite and the hole transport layers and a manual P3 step was performed by Kapton tape masking.”

The cell has an ‘n-i-p’ layout and is composed of the fluorine-doped tin oxide (FTO) substrate, a Tin(IV) oxide (SnO2) layer, the perovskite film, a layer made of gold (Au). It also has a spiro-OMeTAD hole-blocking layer, which is typically used as a hole transport material for solid-state dye solar cells and perovskite devices.

The best performing slot-die coated solar cell showed an efficiency of 18.03%, an open-circuit voltage of 1024 mV, a fill factor of 78.6% and short-circuit current density of 22.4 mA cm−2.

“The device performance reproducibility was assessed by fabricating 30 devices from the same substrate,” the academics said, adding that their average efficiency was 16.35%.

They described the cell and the related production process in “Slot-die coated methylammonium-free perovskite solar cells with 18% efficiency,” which was recently published in Solar Energy Materials and Solar Cells.

“This work provides an insight into the processing window for perovskite meniscus coating and paves the way toward large-scale processing of MA-free perovskites,” the researchers said.

LEAVE A REPLY

Please enter your comment!
Please enter your name here

- Advertisment -

Most Popular

Asia Pacific solar and wind investments to double by 2030 – Wood Mackenzie

Annual investment in solar and wind generation in the Asia Pacific region could double to US$1.3 trillion by 2030 compared to the previous decade,...

1366 Technologies to invest US$300 million in solar manufacturing in India, seeking local partner

Solar wafer provider 1366 Technologies is actively exploring manufacturing opportunities in India, seeking a local partner. US-based 1366 Technologies, which is backed by Bill Gates’...

Michigan utility plans 8GW of solar as part of coal phaseout strategy

Michigan utility Consumers Energy has revealed plans to build nearly 8GW of solar by 2040 as part of efforts to accelerate its transition away...

Amazon takes renewables portfolio to 10GW with new solar spending spree

Amazon has announced 14 new renewable projects in the US, Canada, Finland, and Spain, strengthening its position as the largest corporate buyer of renewables...