Stretchable Perovskite Solar Cells

  • Author: Angewandte Chemie International Edition
  • Published Date: 16 July 2020
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Stretchable Perovskite Solar Cells

Perovskite solar cells (PSCs) are a promising photovoltaic technology for applications that require stretchable materials because of their flexibility, low weight, and low cost. However, perovskite films on flexible substrates are naturally brittle and possess poor crystallinity and numerous grain boundaries. This results in performance losses. Grain-boundary defects are crucial for the stability of PSCs: Under mechanical stress, cracks are first observed at the grain boundaries.

Xiaotian Hu, Nanchang University, China, Fengyu Li, Jinan University, Guangzhou, China, Yiwang Chen, Nanchang University and Jiangxi Normal University, both Nanchang, China, and colleagues have tackled this problem. The researchers prepared stretchable PSCs using a self-healing polyurethane (s-PU). The s-PU was synthesized by a polyaddition of multifunctional oximes and hexamethylene diisocyanate at ambient temperature. The resulting material has reversible covalent oxime–carbamate bonds (pictured below). It was introduced as a scaffold into the perovskite crystallization process. Perovskite films produced in this way have an enhanced grain size and improved crystallinity. The perovskite films (pictured below in red) were coated onto a stretchable polydimethylsiloxane substrate (pictured below in cyan).

Because of its dynamic oxime–carbamate bonds, the s-PU can effectively self-repair cracks at the grain boundaries caused by stretching via thermal annealing at 100 °C. The flexible PSCs achieve a power conversion efficiency (PCE) of 19.15 % and can recover over 90 % of their original PCE after 1,000 cycles of 20 % stretching




Article Views: 698

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from, please contact us first for permission. more

CONNECT: on Facebook on Twitter on YouTube on LinkedIn Sign up for our free newsletter

Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH