An international research group has developed an inverted perovskite solar cell with an active area of 9.6 mm2 by using polymer dipoles for interfacial engineering. It retained 96% of its initial power conversion efficiency after continuous maximum power point (MPP) tracking for 1,000 hours.
Perovskite solar cell developed at Helmholtz-Zentrum Berlin
An international research group has fabricated an inverted perovskite solar cell based by using polymer to improve the low-defect crystallinity of the perovskite film. Dipoles, which are molecules with opposite charges on the ends, are commonly used in solar research for interfacial engineering strategies in organic and perovskite solar cells.
The scientists built the solar cell with an active area of 9.6 mm 2 and a p-i-n structure, which means the perovskite cell material is deposited onto the hole transport layer, and then coated with the electron transport layer, unlike with conventional n-i-p device architecture. Inverted perovskite solar cells typically show strong stability, but lag behind conventional devices in terms of conversion efficiency and cell performance.
The researchers said that dipoles on the perovskite sur face can suppress ion migration, while facilitating interfacial charge extraction and enhancing hydrophobicity. They used a type of dipole known as b-pV2F and said it enabled a more compact perovskite film with an enlarged grain size of around 480 nm.
“Atomic force microscopy images showed that b-pV2F reduced the surface roughness from 54.4 to 41.1 nm, which is expected to ameliorate coverage with charge-transporting layers,” they said.
The team measured the entire film formation process via grazing incidence wide-angle x-ray scattering (GIWAXS) and found that b-pV2F controls the perovskite crystallization by reducing perovskite formation energy, which results in a more ordered crystal structure. The cell configuration features a glass/indium tin oxide (ITO ) substrate, an electron acceptor made of phenyl-C61-butyric acid methyl ester (PCBM), a perovskite layer, a phenyl-C61-butyric acid methyl ester (PCBM) layer , and a silver (Ag) metal contact.
The device achieved a power conversion efficiency of 24.2% under standard illumination conditions, an open-circuit voltage of 1.18 V , a short-circuit current of 24.8 mA/cm 2 , and a fill factor of 84.3%. The Shanghai Institute of Microsystem and Information Technology (SIMIT) confirmed the results.
“The stability of unencapsulated devices under working conditions shows that target perovskite solar cells retain 96% of the initial power conversion efficiency after continuous maximum power point tracking for 1,000 hours,” the scientists said.
They described the cell technology in “Highly efficient p-i-n perovskite solar cells that endure temperature variations,” which was recently published in Science. The research group includes academics from Helmholtz-Zentrum Berlin (HZB) and the University of Stuttgart in Germany, the Chinese Academy of Sciences, and Swansea University in the United Kingdom.
This content is protected by copyright and may not be reused. If you want to cooperate with us and would like to reuse some of our content, please contact: editors@pv-magazine.com.
More articles from Emiliano Bellini
Please be mindful of our community standards.
Your email address will not be published. Required fields are marked *
Save my name, email, and website in this browser for the next time I comment.
By submitting this form you agree to pv magazine using your data for the purposes of publishing your comment.
Your personal data will only be disclosed or otherwise transmitted to third parties for the purposes of spam filtering or if this is necessary for technical maintenance of the website. Any other transfer to third parties will not take place unless this is justified on the basis of applicable data protection regulations or if pv magazine is legally obliged to do so.
You may revoke this consent at any time with effect for the future, in which case your personal data will be deleted immediately. Otherwise, your data will be deleted if pv magazine has processed your request or the purpose of data storage is fulfilled.
Further information on data privacy can be found in our Data Protection Policy.
Legal Notice Terms and Conditions Privacy Policy © pv magazine 2023
This website uses cookies to anonymously count visitor numbers. View our privacy policy. ×
The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.