Perovskite solar cells passivated by distorted two-dimensional structure
文献类型：期刊论文
| 作者 | Fu Peng-Fei; Yu Dan-Ni; Peng Zi-Jian; Gong Jin-Kang; Ning Zhi-Jun |
| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2019-08-05 |
| 卷号 | 68期号:15 |
| 关键词 | perovskite solar cell two-dimensional structure |
| ISSN号 | 1000-3290 |
| DOI | 10.7498/aps.68.20190306 |
| 文献子类 | Article |
| 英文摘要 | Hybrid perovskites are a series of solution-processable materials for photovoltaic devices. To achieve better performance and stability, interface passivation is an effective method. So far, the most commonly used passivators are organic amines, which can tailor perovskite into a lower-dimensional structure (RuddlesdenPopper perovskite). Here, we select a biimizole (BIM) molecule as a new passivator for perovskite. The BIM based single layer perovskite has a more rigid structure. And multi-layered structure cannot be formed due to large lattice mismatching and structural rigidity. By inducing the excess MAI (methanaminium iodide) into the lattice, the layered structure is maintained, and half of the BIM molecules are replaced by MA (methylamine). The mixed layered structure is distorted, because of the difference in size between two kinds of cations. We then investigate passivation effect of BIM on perovskite solar cells. By carefully controlling the feed ratio in precursor solutions, we fabricate solar cells with different passivation structures. We find that the introduction of BIM can cause V-oc to increase generally, indicating that MAPbI(3) is well passivated. The peak at 7.5 degrees and 15 degrees in X-ray diffraction pattern are corresponding to a two-dimensional (2D) phase with a shorter layer distance. There are no peaks at lower degrees, so that no multi-layered structure is formed in the film either. We suppose that a dual-phase 2D-3D (where 3D represents three-dimensional) structure is formed in the perovskite film. To explain the passivation effect of the two 2D structures, we investigate their lattice matching towards MAPbI(3). The distorted 2D structure is well matched with (110) face of o-MAPbI(3), and the mismatching rate is lower 1% in the two directions. On the other hand, the BIM based 2D structure cannot well match with (-110) face of o-MAPbI(3), nor with (001) face of c-MAPbI(3). We also consider that the less rigidity of distorted structure contributes to better passivation. As a result, we achieve a BIM passivated perovskite solar cell with a power conversion efficiency up to 14%. This work paves a new way to the interface engineering of perovskite solar cells. |
| WOS研究方向 | Physics |
| 语种 | 中文 |
| 出版者 | CHINESE PHYSICAL SOC |
| 源URL | [http://ir.sic.ac.cn/handle/331005/26920]  |
| 专题 | 中国科学院上海硅酸盐研究所 |
| 推荐引用方式 GB/T 7714 | Fu Peng-Fei,Yu Dan-Ni,Peng Zi-Jian,et al. Perovskite solar cells passivated by distorted two-dimensional structure[J]. ACTA PHYSICA SINICA,2019,68(15). |
| APA | Fu Peng-Fei,Yu Dan-Ni,Peng Zi-Jian,Gong Jin-Kang,&Ning Zhi-Jun.(2019).Perovskite solar cells passivated by distorted two-dimensional structure.ACTA PHYSICA SINICA,68(15). |
| MLA | Fu Peng-Fei,et al."Perovskite solar cells passivated by distorted two-dimensional structure".ACTA PHYSICA SINICA 68.15(2019). |
入库方式： OAI收割
来源：上海硅酸盐研究所
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