Flexible perovskite solar module with 10.5% efficiency

The methylammonium-free inverted solar module was built on a flexible substrate made of polyethylene terephthalate (PET). A hole transporting material made of poly(triarylamine) (PTAA) and a double-cation cesium formamidinium (CsFA) perovskite layer were deposited through blade-coating and nitrogen-assisted blade-coating.

June 18, 2021

Researchers at the University of Rome Tor Vergata in Italy have unveiled a flexible solar module based on perovskite with an active area of 15.7 cm2.

It is the first flexible perovskite module that shows stability under light exposure,” Luigi Angelo Castriotta, a researcher at the university’s Centre for Hybrid and Organic Solar Energy (CHOSE), told pv magazine. “It can be used for applications in building-integrated photovoltaics (BIPV), Internet-of-Things (IoT), and e-mobility.”

The methylammonium-free inverted solar module was built on a flexible substrate made of polyethylene terephthalate (PET). A hole transporting material made of poly(triarylamine) (PTAA) and a double-cation cesium formamidinium (CsFA) perovskite layer were deposited through blade-coating and nitrogen-assisted blade-coating. A two-minute oxygen plasma treatment was performed on the PET substrate prior to layer processing.

“PTAA and perovskite deposition by blade-coating are proposed as the main ways to boost the light stability by limiting the charge losses occurring at the PTAA/perovskite layer,” the Italian group explained, noting that the PTAA layer was optimized using anisole instead of toluene as a solvent in air and clean-room environment.

The solar module showed a power conversion efficiency of 10.5%, an open-circuit voltage of 8.26 V, a short-circuit current of 18.48 A and a fill factor of 55.03%. The panel is described as the most stable large-area perovskite module reported to date. “The use of scaling-up techniques, such as a blade-coating process, in the field of perovskite opens a feasible path to further increase the stability of flexible modules while keeping this technology repeatable, cheaper, and suitable for flexible solar panel technology,” the academics affirmed.

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Looking forward, the research team is planning to investigate the recovery process of the devices under dark conditions through light/dark cycle tests. The panel is described in the study “Light-Stable Methylammonium-Free Inverted Flexible Perovskite Solar Modules on PET Exceeding 10.5% on a 15.7 cm2 Active Area,” published in ACS Applied Materials & Interfaces.

In March, the University of Rome Tor Vergata also presented a perovskite solar module with a total active area of 42.8 cm2 and aperture area of 50 cm2. The panel was built with 20%-efficient perovskite cells connected in 14 series and was able to retain 90% of the initial efficiency after 800 h of thermal stress at 85 degrees Celsius.

Later in June, it unveiled a perovskite solar module with cells based on triple-cation cesium methylammonium formamidinium (CsMAFA).

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