Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs
文献类型：期刊论文
| 作者 | Liu, Chang; Sun, Jingsong; Tan, Wen Liang; Lu, Jianfeng; Gengenbach, Thomas R.; McNeill, Christopher R.; Ge, Ziyi; Cheng, Yi-Bing; Bach, Udo |
| 刊名 | NANO LETTERS
 |
| 出版日期 | 2020 |
| 卷号 | 20期号:2页码:1240-1251 |
| 关键词 | SOLAR-CELLS HIGHLY EFFICIENT PERFORMANCE HYSTERESIS ABSORBER ORIGIN IMPACT |
| DOI | 10.1021/acs.nanolett.9b04661 |
| 英文摘要 | 3D/2D hybrid perovskite systems have been intensively investigated to improve the stability of perovskite solar cells (PSCs), whereas undesired crystallization of 2D perovskite during the film formation process could undermine the structural stability of 2D perovskite materials, which causes serious hysteresis of PSCs after aging. This issue is, however, rarely studied. The stability study for 3D/2D hybrid systems to date is all under the one-direction scan, and the lack of detailed information on the hysteresis after aging compromises the credibility of the stability results. In this work, by correlating the hysteresis of the hybrid PSCs with the 2D crystal structure, we find that the prompt 2D perovskite formation process easily induces numerous crystal imperfections and structural defects. These defects are susceptible to humidity attack and decompose the 2D perovskite to insulating long-chain cations and 3D perovskite, which hinder charge transfer or generate charge accumulation. Therefore, a large hysteresis is exhibited after aging the 3D/2D hybrid PSCs in an ambient environment, even though the reverse-scan power conversion efficiency (PCE) is found to be well-preserved. To address this issue, alkali cations, K+ and Rb+, are introduced into the 2D perovskite to exquisitely modulate the crystal formation, which gives rise to a higher crystallinity of 2D perovskite and a better film morphology with fewer defects. We achieved PCE beyond 21% due to the preferable charge transfer process and reduced nonradiative recombination losses. The structural features also bring about impressive moisture stability, which results in the corresponding PSCs retaining 93% of its initial PCE and negligible hysteresis after aging in an ambient atmosphere for 1200 h. |
| 学科主题 | Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/20039]  |
| 专题 | 2020专题 2020专题_期刊论文 |
| 作者单位 | 1.Bach, U (corresponding author), Monash Univ, Dept Chem Engn, Clayton, Vic 3800, Australia. 2.Liu, C (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China. 3.Liu, C |
| 推荐引用方式 GB/T 7714 | Liu, Chang,Sun, Jingsong,Tan, Wen Liang,et al. Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs[J]. NANO LETTERS,2020,20(2):1240-1251. |
| APA | Liu, Chang.,Sun, Jingsong.,Tan, Wen Liang.,Lu, Jianfeng.,Gengenbach, Thomas R..,...&Bach, Udo.(2020).Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs.NANO LETTERS,20(2),1240-1251. |
| MLA | Liu, Chang,et al."Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs".NANO LETTERS 20.2(2020):1240-1251. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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