Spontaneous Passivation of Hybrid Perovskite by Sodium Ions from Glass Substrates: Mysterious Enhancement of Device Efficiency Revealed

被引：164
作者：
Bi, Cheng [1 ,2 ]
Zheng, Xiaopeng [1 ,2 ]
Chen, Bo [1 ,2 ]
Wei, Haotong [1 ,2 ]
Huang, Jinsong [1 ,2 ,3 ]
机构：
[1] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA
[2] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA
[3] Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA
来源：
ACS ENERGY LETTERS | 2017年 / 2卷 / 06期
基金：
美国国家科学基金会;
关键词：
SOLAR-CELLS; PHOTOLUMINESCENCE ENHANCEMENT; GRAIN-GROWTH; THIN-FILMS; CU(IN; GA)SE-2; PERFORMANCE; HYSTERESIS; DEPOSITION; INTERFACE; DIFFUSION;
D O I：
10.1021/acsenergylett.7b00356
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：
The efficiency of a solar cell generally decreases over time due to degradation of the devices. Here we report a spontaneous increase of device efficiency for organic inorganic hybrid perovskite (OIHP) solar cells after a period of storage that is speculated to be related to the sodium ions (Na+) diffused from the substrate. The efficiency of a p-i-n planar heterojunction structure device rises from 18.8 to 20.2% after 24 h of storage in nitrogen. The increased efficiency can be explained by the prolonged carrier lifetime and reduced trap density in the OIHP films. The expected contribution by N+ in defect passivation has been evidenced by studying the evolution of the film's photoluminescence (PL) lifetime, trap density, and device efficiency over storage duration on varied substrates that either contain Nat or do not. The passivation effect of N+ is further identified by the improved PL lifetime observed in the OIHP film made on a silicon substrate with intentionally added Na+.
引用
收藏
页码：1400 / 1406
页数：7
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