title: Easily accessible polymer additives for tuning the crystal-growth of perovskite thin-films for highly efficient solar cells.
abstract: For perovskite solar cells (Pero-SCs), one of the key issues with respect to the power conversion efficiency (PCE) is the morphology control of the perovskite thin-films. In this study, an easily-accessible additive polyethylenimine (PEI) is utilized to tune the morphology of CH3NH3PbI3-xClx. With addition of 1.00 wt% of PEI, the smoothness and crystallinity of the perovskite were greatly improved, which were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). A summit PCE of 14.07% was achieved for the p-i-n type Pero-SC, indicating a 26% increase compared to those of the devices without the additive. Both photoluminescence (PL) and alternating current impedance spectroscopy (ACIS) analyses confirm the efficiency results after the addition of PEI. This study provides a low-cost polymer additive candidate for tuning the morphology of perovskite thin-films, and might be a new clue for the mass production of Pero-SCs.
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Dong
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Zhaowei
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Kaicheng
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Hao
authors.initials: H
authors.lastname: Yu
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Peng
authors.initials: P
authors.lastname: Huang
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Liu
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Ning
authors.initials: N
authors.lastname: Chen
authors.affiliation: Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P.R. China. yizhou@suda.edu.cn chenning@suda.edu.cn songbo@suda.edu.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Song