Constructing efficient mixed-ion perovskite solar cells based on TiO2 nanorod array

被引:85
作者
Yang, Longkai [1 ]
Wang, Xin [1 ]
Mai, Xianmin [2 ]
Wang, Tan [3 ]
Wang, Chao [4 ,5 ]
Li, Xin [1 ]
Murugadoss, Vignesh [4 ,6 ]
Shao, Qian [7 ]
Angaiah, Subramania [6 ]
Guo, Zhanhu [4 ]
机构
[1] Xiamen Univ, Pen Tung Sah Inst Micronano Sci & Technol, Xiamen 361005, Peoples R China
[2] Southwest Minzu Univ, Sch Urban Planning & Architecture, Chengdu 610041, Sichuan, Peoples R China
[3] Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China
[4] Univ Tennessee, ICL, Dept Chem & Biomol Engn, Knoxville, TN 37996 USA
[5] North Univ China, Coll Mat Sci & Engn, Taiyuan 030051, Shanxi, Peoples R China
[6] Pondicherry Univ, Ctr Nanosci & Technol, Electrochem Energy Res Lab, Pondicherry 605014, India
[7] Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Qingdao 266590, Peoples R China
基金
中国国家自然科学基金;
关键词
TiO2; Nanorod array; Mixed-ion; Perovskite solar cell; LEAD IODIDE PEROVSKITES; NANOTUBE ARRAYS; RUTILE TIO2; PERFORMANCE; LAYER; CRYSTALLIZATION; PASSIVATION; TEMPERATURE; CATIONS; FILM;
D O I
10.1016/j.jcis.2018.09.045
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Oriented TiO2 nanorod array (TiO2 NA) is very attractive in the fields of halide perovskite solar cells (PSCs) due to its fewer grain boundaries and high crystallinity for effective charge collection. The optimization of TiO2 nanostructures has been proved to be an effective approach for efficient PSCs. On the other hand, tuning the crystallization of perovskite films on top of the TiO2 NA is very important for efficient TiO2-NA based PSCs. Herein, scanning electron microscopy (SEM) and X-ray powder diffraction (XRD) were used to study the crystallization of different mixed-ion Cs-0.1(FA(0.83)MA(0.17))(0.9)Pb(I0.83Br0.17)(3) perovskite (in which MA = CH3NH3+ and FA = CH(NH2)(2)(+)) films, from different perovskite precursor concentrations, on the TiO2 nanorod arrays. A mechanism was proposed to reveal the inherent connection between the precursor concentration and the crystallite growth of the perovskite film prepared with anti solvent quenching process. Meanwhile, both faster charge separation at perovskite/TiO2 NA interface and longer charge transport were observed on thicker perovskite film with larger grains, revealed by the time-resolved method. However, atomic force microscopy (AFM) results indicated that too thick perovskite film impaired the charge collection owing to the increased recombination. By balancing the charge collection and film thickness, highly efficient PSC5 were prepared with a champion power conversion efficiency (PCE) of 19.33% with little hysteresis. The study highlights a great potential of incorporating oriented one-dimensional electron extraction materials in high-performance PSCs and other applications. (C) 2018 Elsevier Inc. All rights reserved.
引用
收藏
页码:459 / 468
页数:10
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