Photoinduced Reversible Structural Transformations in Free-Standing CH3NH3PbI3 Perovskite Films

被引:192
作者
Gottesman, Ronen [1 ]
Gouda, Laxman [1 ]
Kalanoor, Basanth S. [1 ]
Haltzi, Eynay [1 ]
Tirosh, Shay [1 ]
Rosh-Hodesh, Eli [1 ]
Tischler, Yaakov [1 ]
Zaban, Arie [1 ]
Quarti, Claudio [2 ]
Mosconi, Edoardo [2 ]
De Angelis, Filippo [2 ]
机构
[1] Bar Ilan Univ, Dept Chem, Ctr Nanotechnol & Adv Mat, IL-52900 Ramat Gan, Israel
[2] CNR ISTM, Computat Lab Hybrid Organ Photovolta CLHYO, I-06123 Perugia, Italy
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2015年 / 6卷 / 12期
关键词
METHYLAMMONIUM LEAD IODIDE; ION-BEAM ANALYSIS; SOLAR-CELLS; HALIDE PEROVSKITES; LOW-COST; EFFICIENCY; HYSTERESIS; DIFFUSION; RAMAN; CH(3)NH(3)PBL(3);
D O I
10.1021/acs.jpclett.5b00994
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
In the pursuit to better understand the mechanisms of perovskite solar cells we performed Raman and photoluminescence measurements of free-standing CH3NH3PbI3 films, comparing dark with working conditions. The films, grown on a glass substrate and sealed by a thin glass coverslip, were measured subsequent to dark and white-light pretreatments. The extremely slow changes we observe in both the Raman and photoluminescence cannot be regarded as electronic processes, which are much faster. Thus, the most probable explanation is of slow photoinduced structural changes. The CH3NH3PbI3 transformation between the dark and the light structures is reversible, with faster rates for the changes under illumination. The results seem to clarify several common observations associated with solar cell mechanisms, like performance improvement under light soaking. More important is the call for solar-cell-related investigation of CH3NH3PbI3 to take the photoinduced structural changes into consideration when measuring and interpreting the results.
引用
收藏
页码:2332 / 2338
页数:7
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