Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 72, Pages 18140-18145Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201704181
Keywords
additives; CH3NH3PbI3; high efficiency; isopropanol; perovskite solar cells
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Funding
- National Natural Science Foundation of China (NSFC) [11604279, 51702276, 61675175]
- Foundation of He'nan Educational Committee [15A413017, 16A430027, 16A480004]
- Key Technologies RAMP
- D program of He'nan province [172102210459]
- Program Projects of Science and Technology Innovative Research Team of Henan Province [18IRTSTHN017]
- Doctoral Research Foundation of Xinyang Normal University (XYNU)
- Nanhu Scholars Program for Young Scholars of XYNU
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To reduce intrinsic defect density in perovskite films, various additives are often added into the precursor solution. In this paper, a novel solution, in which isopropanol (IPA) was added into the precursor solution, was developed for the preparation of normal planar perovskite solar cells (PSCs). A champion power conversion efficiency (PCE) of 19.70% was achieved with this approach. By adding IPA into the precursor solution, CH3NH3PbI3 perovskite showed better crystallization and stability, indicating improved film quality. Because of the improved morphology of perovskite crystal, the PCE of PSCs increased. In addition, the unencapsulated PSCs retained high output for up to 40 days in air at room temperature, indicating the stability of PSCs. These results may provide a new avenue for manufacturing high efficiency and high stability PSCs.
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