An Equalized Flow Velocity Strategy for Perovskite Colloidal Particles in Flexible Perovskite Solar Cells

Author:

Gong Chenxiang1,Wang Cong1,Meng Xiangchuan1,Fan Baojin2,Xing Zhi1,Shi Siyi1,Hu Ting1,Huang Zengqi2,Hu Xiaotian13,Chen Yiwang123ORCID

Affiliation:

1. College of Chemistry and Chemical Engineering/ Film Energy Chemistry for Jiangxi Provincial Key Laboratory (FEC) Nanchang University 999 Xuefu Avenue Nanchang 330031 China

2. College of Chemistry and Chemical Engineering/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal University 99 Ziyang Avenue Nanchang 330022 China

3. Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010 China

Abstract

AbstractThe non‐uniform distribution of colloidal particles in perovskite precursor results in an imbalanced response to the shear force during flexible printing process. Herein, it is observed that the continuous disordered migration occurring in perovskite inks significantly contributes to the enlargement of colloidal particles size and diminishes the crystallization activity of the inks. Therefore, a molecular encapsulation architecture by glycerol monostearate to mitigate colloidal particles collisions in the precursor ink, while simultaneously homogenizing the size distribution of perovskite colloids to minimize their diffusion disparities, is devised. The utilization of colloidal particles with a molecular encapsulation structure enables the achievement of uniform deposition during the printing process, thereby effectively balancing the crystallization rate and phase transition in the film and facilitating homogeneous crystallization of perovskite films. The large‐area flexible perovskite device (1.01 cm2 and 100 cm2) fabricated through printing processes, achieves an efficiency of 24.45% and 15.87%, respectively, and manifests superior environmental stability, maintaining an initial efficiency of 91% after being stored in atmospheric ambiences for 150 days (unencapsulated). This work demonstrates that the dynamic evolution process of colloidal particles in both the precursor ink and printing process represents a crucial stride toward achieving uniform crystallization of perovskite films.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangxi Province

National Postdoctoral Program for Innovative Talents

China Postdoctoral Science Foundation

Publisher

Wiley

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