Enhanced Photovoltaic Performance of Perovskite Solar Cells Using Polymer P(VDF-TrFE) as a Processed Additive

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• 作者：Chongyang Sun ; Yiping Guo ; Bijun Fang ; Jiaming Yang ; Ben Qin ; Huanan Duan ; Yujie Chen ; Hua Li ; Hezhou Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 23, 2016
• 年：2016
• 卷：120
• 期：24
• 页码：12980-12988
• 全文大小：627K
• 年卷期：0
• ISSN：1932-7455

文摘

It 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.