期刊
JOURNAL OF POWER SOURCES
卷 428, 期 -, 页码 82-87出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2019.04.056
关键词
Perovskite solar cells; Defect passivation; Crosslinking agents; Hydrogen bonds
资金
- National Natural Science Foundation of China [21671141, 51672181]
- 973 Program - the National Basic Research Program of China Special Funds for the Chief Young Scientist [2015CB358600]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions for Optical Engineering in Soochow University
- Jiangsu collaborative innovation centre of photovoltaic science and engineering in Changzhou University
Defects easily form in organic-inorganic hybrid perovskite (CH3NH3PbX3) absorber layers acting as recombination centers which reduce the performance of solar cells. Therefore, defect passivation is an efficient method to improve the performance of solar cells. Herein, ethylamine alcohol chlorides is introduced into perovskite films to passivate defects. The hydroxyl group and ammonium group in ethylamine alcohol chlorides can interact with halogen in MAPbI(x)Cl(3-x) to form hydrogen bonds suppressing ion migration. In addition, the crosslinking neighbouring perovskite grains through hydrogen bonds can also improve the perovskite grain size and film coverage. The data demonstrate that the obvious reduction of the defect concentration via defect passivation contributes to an enhancement of the open-circuit voltage from 0.87 V to 0.92 V and the device efficiency from 14.52% to 16.97%.
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