Thermal Dynamic Self‐Healing Supramolecular Dopant Towards Efficient and Stable Flexible Perovskite Solar Cells. (3rd February 2022)

• Record Type: Journal Article
• Authors: Ge, Chengda; Liu, Xiaoting; Yang, Ziqi; Li, Hanming; Niu, Wenwen; Liu, Xiaokong; Dong, Qingfeng
• Is Part Of: Angewandte Chemie. Volume 134:Number 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-03
• Subjects: Adhesive -- Flexible Perovskite Solar Cell -- Self-Healing -- Supramolecular; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202116602
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Flexible perovskite solar cells (FPSCs) have attracted great attention due to their advantageous traits such as low cost, portability, light‐weight, etc. However, mechanical stability is still the weak point in their practical application. Herein, we prepared efficient FPSCs with remarkable mechanical stability by a dynamic thermal self‐healing effect, which can be realized by the usage of a supramolecular adhesive. The supramolecular adhesive, which was obtained by random copolymerization of acrylamide and n‐butyl acrylate, is amphiphilic, has a proper glass transition temperature and a high density of hydrogen‐bond donors and receptors, providing the possibility of thermal dynamic repair of mechanical damage in FPSCs. The adhesive also greatly improves the leveling property of the precursor solution on the hydrophobic poly[bis(4‐phenyl)(2, 4, 6‐trimethylphenyl)]amine (PTAA) surface. PSCs containing this adhesive achieve more than a 20 % power conversion efficiency (PCE) on flexible substrates and a 21.99 % PCE on rigid substrates (certified PCE of 21.27 %), with improved electron mobility and reduced defect concentration. Abstract : Amphiphilic supramolecular adhesives with low glass transition temperature and massive hydrogen bonds were designed by random copolymerization of acrylamide and n‐butyl acrylate. The adhesive dopant facilitates a dynamic thermal self‐healing effect at only 70 °C and contributes to efficient and highly flexible perovskite solar cells.