MODULATING CH3NH3PbI3 PEROVSKITE CRYSTALLIZATION BEHAVIOR THROUGH PRECURSOR CONCENTRATION

被引：8
作者：
Fu, Kunwu [1 ,2 ]
Lim, Swee Sien [3 ]
Fang, Yanan [1 ,2 ]
Boix, Pablo P. [1 ]
Mathews, Nripan [1 ,2 ,4 ]
Sum, Tze Chien [3 ]
Wong, Lydia H. [2 ]
Mhaisalkar, Subodh [1 ,2 ]
机构：
[1] Energy Res Inst NTU ERI N, Singapore 637553, Singapore
[2] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore
[3] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
[4] Singapore Berkeley Res Initiat Sustainable Energy, Singapore 138602, Singapore
来源：
NANO | 2014年 / 9卷 / 05期
基金：
新加坡国家研究基金会;
关键词：
Perovskite; solution concentration; crystal formation; morphological; photoluminescence; crystallographic; SOLAR-CELLS; EFFICIENT; NANOPARTICLES; TRANSPORT;
D O I：
10.1142/S1793292014400037
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Perovskite-based photovoltaic devices have recently achieved impressively high efficiencies beyond 15% and gained great interest. We show here the formation of perovskite cluster overlayer structures which consist of individual perovskite grains on top of mesoporous TiO2 films, coexisting with the randomly distributed nanocrystals within the films. Perovskite solution concentration was found to play an important role in modulating the perovskite crystallization and cluster overlayer formation process. Absorbance increase in visible wavelength range and shift of photoluminescence (PL) responses of perovskite films due to the er effect of precursor concentration change were observed and investigated in detail. The crystallographic analysis of the CH3NH3PbI3 films shows a gradual decrease of the perovskite lattice parameters and shrinkage of unit volume as precursor solution concentration increases, which is correlated to the changes of optical properties. Finally, perovskite-based solar cell device performance was enhanced at higher precursor concentration.
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页数：9
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