Enhanced efficiency and stability of triple‐cation perovskite solar cells with CsPbIxBr3 − x QDs “surface patches”
Guang Yang,
Hengkai Zhang,
Siqi Li,
Zhiwei Ren,
Guojia Fang,
Dangyuan Lei,
Gang Li
Affiliations
Guang Yang
Department of Electronic and Information Engineering, Research Institute of Smart Energy The Hong Kong Polytechnic University Hong Kong China
Hengkai Zhang
Department of Electronic and Information Engineering, Research Institute of Smart Energy The Hong Kong Polytechnic University Hong Kong China
Siqi Li
Department of Materials Science and Engineering, and Centre for Functional Photonics City University of Hong Kong Hong Kong China
Zhiwei Ren
Department of Electronic and Information Engineering, Research Institute of Smart Energy The Hong Kong Polytechnic University Hong Kong China
Guojia Fang
Key Laboratory of Artificial Micro‐ and Nano‐structures of Ministry of Education of China, School of Physics and Technology Wuhan University Wuhan China
Dangyuan Lei
Department of Materials Science and Engineering, and Centre for Functional Photonics City University of Hong Kong Hong Kong China
Gang Li
Department of Electronic and Information Engineering, Research Institute of Smart Energy The Hong Kong Polytechnic University Hong Kong China
Abstract Perovskite solar cells (PSCs) with a light‐harvesting three‐dimensional perovskite bulk layer as backbone component have achieved great progress in performance. Nonradiative recombination is one major place to improve efficiency and stability as they cause significant energy loss in PSCs. Additionally, an imperfection in grain boundaries will initiate device degradation. One of the most successful strategies to decrease nonradiative recombination in PSCs is the introduction of reduced dimensional perovskite (e.g., perovskite quantum wells), benefiting the device's efficiency and stability tremendously. Here, instead of quantum wells, mixed‐cation perovskites with ligand‐contained CsPbBrxI3 − x quantum dots (QDs) are prepared, which is shown to function as perovskite healing “surface patches.” Benefiting from the “surface patches” effect, the QDs‐film shows reduced defects and enhancing film quality which lead to the excellent performance of solar cells (enhancing the power conversion efficiency from 19.21% of the control device to 21.71% [22.1% in reverse scan]).