Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 120, Issue 24, Pages 12980-12988Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b05255
Keywords
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Funding
- National Natural Science Foundation of China [11474199]
- Research Fund of Jiangsu Key Laboratory for Solar Cell Materials and Technology [SKLPSTKF201501]
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is known that CH3NH3PbI3 perovskite films with high crystallization and controlled morphology always show enhanced power conversion efficiency. Here we incorporate a small amount of polyvinylidene fluoride trifluoroethylene polymer P(VDF-TrFE) into PbI2 solution to control the crystallinity and morphology of perovskite layer in a two-step deposition process. Our results show that the P(VDF-TrFE) bridges the grain boundaries and also enhances the crystallinity of the perovskite layer significantly. By adjusting P(VDF-TrFE) concentration, the fabricated perovskite solar cells show improved average power conversion efficiency from 9.57 0.25% to 12.54 0.40% under a standard illumination of 100 milliwatts per square centimeter, which increases by nearly 31%. Thus, we demonstrate a new strategy to control the crystallinity and morphology of perovskite films by incorporating polymer into PbI2 film in a two-step deposition process. In addition, this method has been proven as an effective way to prepare high-performance perovskite solar cells.
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