title: Chitosan-Assisted Crystallization and Film Forming of Perovskite Crystals through Biomineralization.
abstract: Biomimetic mineralization is a powerful approach for the synthesis of advanced composite materials with hierarchical organization and controlled structure. Herein, chitosan was introduced into a perovskite precursor solution as a biopolymer additive to control the crystallization and to improve the morphology and film-forming properties of a perovskite film by way of biomineralization. The biopolymer additive was able to control the size and morphology of the perovskite crystals and helped to form smooth films. The mechanism of chitosan-mediated nucleation and growth of the perovskite crystals was explored. As a possible application, the chitosan-perovskite composite film was introduced into a planar heterojunction solar cell and increased power conversion efficiency relative to that observed for the pristine perovskite film was achieved. The biomimetic mineralization method proposed in this study provides an alternative way of preparing perovskite crystals with well-controlled morphology and properties and extends the applications of perovskite crystals in photoelectronic fields, including planar-heterojunction solar cells.
authors.affiliation: State Key Laboratory of Pulp & Paper Engineering, School of Light industry Science and Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Sun
authors.affiliation: Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Hin-Lap
authors.initials: HL
authors.lastname: Yip
authors.affiliation: State Key Laboratory of Pulp & Paper Engineering, School of Light industry Science and Engineering, South China University of Technology, Guangzhou, 510640, China.|Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China.
authors.forename: Runcang
authors.initials: R
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Pulp & Paper Engineering, School of Light industry Science and Engineering, South China University of Technology, Guangzhou, 510640, China. fewangxh@scut.edu.cn.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Wang
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D003460:Crystallization; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D008903:Minerals / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D008903:Minerals; D010087:Oxides; C059910:perovskite; D048271:Chitosan; D014025:Titanium
keywords: biomimetic synthesis; biomineralization; crystallization; film-forming properties; perovskite phases